Garmin | GMA™ 35 | Garmin GMA™ 35 System Maintenance Manual with ICA, GTN 6XX/7XX Part 23 AML STC

Garmin GMA™ 35 System Maintenance Manual with ICA, GTN 6XX/7XX Part 23 AML STC
System Maintenance Manual
GTN 6XX/7XX Part 23 AML STC
Contains Instructions for Continued Airworthiness
for STC SA02019SE-D
Aircraft make, model, registration number, and serial
number, along with the applicable STC configuration
information, must be completed in Appendix A and
saved with aircraft permanent records.
190-01007-A1
August 2018
Revision 11
© 2011-2018
Garmin International, Inc., or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,
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190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A
RECORD OF REVISIONS
Revision
Revision Date
Description
7
11/25/14
Revised to incorporate changes associated with GTN main software
version 5.13.
8
2/25/16
Revised to incorporate changes associated with GTN main software
version 6.00.
9
9/16/16
Revised to incorporate changes associated with GTN main software
version 6.21.
10
11/02/17
Revised to incorporate changes associated with GTN main software
version 6.41
11
8/22/18
Revised to incorporate changes associated with GTN main software
version 6.50.
CURRENT REVISION DESCRIPTION
Section
Page i
Description of Change
Added Note pertaining to screen shots as references only.
1.1
Updated section to include scope of maintenance manual and instructions for continued
airworthiness.
1.2
Updated description of Section 3: Control and Operation to include GTN 6XX/7XX, GMA
35/35c, and Flight Stream 210/510.
1.4
Removed Purpose column in Table 1-1 and renamed it Recommended Documents.
Added text related to change.
1.5
Added text explaining that all pages will show current revision level.
Added Windows 10 as a compatible OS for GTN Software Loader Card.
3.2.1
Updated Note to say card readers other than the listed approved models “may” work.
Added Note about SD card size.
3.2.2
Added text to Note for required GTN main software version.
Added Note about Terrain Alerting feature providing a subset of TAWS B functionality.
3.3.4.1
3.3.4.1.1
3.3.4.5
Updated Figure 3-13 GTN 7XX TAWS Configuration Page to include Terrain Alerting
selection.
Changed TAWS Audio subheading to Audio Clips and changed Airport Criteria
subheading to Alert Settings.
Added GWX 75.
5.1
Changed “TAWS audio” to “Terrain audio” and added “COM” in front of “sidetone” in
Table 5-1 GTN Troubleshooting Guide.
7.1
Added clarification to Table 7-1 Configuration and Checkout Procedures to ensure that
the GTN software is the specified version.
7.1.2.4
7.4.6.1
190-01007-A1
Rev. 11
Changed “COM RF” to “COM RX”. Added Note regarding change.
Added COM Carrier Squelch Check subsection.
Added GWX 75.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page B
Section
7.5.1
7.5.1.1
8
Description of Change
Updated “TAWS” to “Terrain” or “Terrain Alerting/TAWS”.
Updated “TAWS” to “Terrain” or “Terrain Alerting/TAWS”.
Added sentence about verifying continuity of wiring.
Changed section heading to “Return to Service Procedure”.
Added compliance requirement to return to service.
8.1
Removed “Database updates performed during maintenance” as an inclusion to
maintenance logs.
Updated COM CONFIGURATION sections to include RX Squelch Mode selections,
Sidetone Source selections, and Sidetone Pilot Control selections.
Appendix A
Added Terrain Alerting selection to TERRAIN CONFIGURATION sections.
Changed “TAWS Settings” section to “Terrain Alert Settings” sections.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page C
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information that is subject to the Export Administration Regulations (EAR)
issued by the United States Department of Commerce (15 Code of Federal Regulations (CFR), Chapter
VII, Subchapter C) and may not be exported, released, or disclosed to foreign nationals inside or outside of
the United States without first obtaining an export license. Include this notice with any reproduced portion
of this document.
The information in this document is subject to change without notice. Visit Garmin’s Dealer Resource
Center for current updates and supplemental information concerning the operation of Garmin products.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
WARNING
Warnings indicate that injury or death is possible if the instructions are
disregarded.
CAUTION
Cautions indicate that damage to the equipment is possible.
NOTE
Notes provide additional information.
WARNING
This product, its packaging, and its components contain chemicals known to the State of
California to cause cancer, birth defects, or reproductive harm. This notice is being
provided in accordance with California’s Proposition 65. If you have any questions, or
would like additional information, please refer to our website at www.garmin.com/prop65.
CAUTION
GTN 6XX/7XX units have a special anti-reflective coated display that is sensitive to waxes
and abrasive cleaners. CLEANERS CONTAINING AMMONIA WILL HARM THE ANTIREFLECTIVE COATING. It is important to clean the display using a clean, lint-free cloth
with a cleaner that is safe for anti-reflective coatings.
NOTE
All screen shots used in this document are current at the time of publication. Screen shots
are intended to provide visual reference only. All information depicted in screen shots,
including software file names, versions, and part numbers, is subject to change and may
not be up-to-date.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page i
TABLE OF CONTENTS
1
2
3
4
5
6
INTRODUCTION..............................................................................................................................1-1
1.1 Content, Scope, and Purpose......................................................................................................1-2
1.2 Organization ...............................................................................................................................1-2
1.3 Definitions and Abbreviations ...................................................................................................1-3
1.4 Publications ................................................................................................................................1-4
1.5 Distribution.................................................................................................................................1-4
SYSTEM DESCRIPTION.................................................................................................................2-1
2.1 Equipment Descriptions .............................................................................................................2-2
2.2 Backplate Connectors.................................................................................................................2-4
2.3 GTN Optional Interfaces ............................................................................................................2-6
2.4 GTN Block Diagram ..................................................................................................................2-7
CONTROL AND OPERATION.......................................................................................................3-1
3.1 GTN Normal Mode Overview ...................................................................................................3-2
3.2 Software Loading .......................................................................................................................3-3
3.3 GTN Configuration Mode Overview .........................................................................................3-8
3.4 Database Updates .....................................................................................................................3-20
INSTRUCTIONS FOR CONTINUED AIRWORTHINESS.........................................................4-1
4.1 Airworthiness Limitations..........................................................................................................4-2
4.2 Servicing Information ................................................................................................................4-2
4.3 Maintenance Intervals ................................................................................................................4-3
4.4 Visual Inspection........................................................................................................................4-5
4.5 Electrical Bonding Test ..............................................................................................................4-6
4.6 Transient Voltage Suppressor (TVS) (If Installed) ....................................................................4-9
4.7 GPS/SBAS Antenna Cable Overbraid Inspection (If Installed)...............................................4-11
4.8 WXR HSDB Cable Overbraid Inspection (If Installed)...........................................................4-11
TROUBLESHOOTING ....................................................................................................................5-1
5.1 GTN General Troubleshooting...................................................................................................5-2
5.2 GTN Failure Annunciations .......................................................................................................5-6
5.3 GTN System Messages ..............................................................................................................5-7
5.4 Flight Stream Troubleshooting.................................................................................................5-24
5.5 GMA 35 Troubleshooting ........................................................................................................5-26
5.6 GMA 35 Failure Annunciations ...............................................................................................5-27
5.7 GMA 35 System Messages ......................................................................................................5-27
EQUIPMENT REMOVAL AND RE-INSTALLATION ...............................................................6-1
6.1 GTN............................................................................................................................................6-2
6.2 GMA 35......................................................................................................................................6-6
6.3 Data Card/Flight Stream 510......................................................................................................6-9
6.4 Flight Stream 210 .....................................................................................................................6-10
6.5 NAV Antenna Cable Diplexer .................................................................................................6-11
6.6 NAV Antenna Cable Splitter....................................................................................................6-11
6.7 Configuration Module (P1001 Only) .......................................................................................6-12
6.8 GTN Fan...................................................................................................................................6-15
6.9 TVS and Fuse (Nonmetallic Aircraft Only) .............................................................................6-18
6.10 GPS/SBAS Antenna Cable Overbraid .....................................................................................6-22
6.11 WXR HSDB Cable Overbraid .................................................................................................6-24
6.12 Instrument Panel Bonding Strap ..............................................................................................6-26
6.13 Flight Stream 210 Bonding Strap.............................................................................................6-27
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page ii
7
EQUIPMENT CONFIGURATION AND TESTING.....................................................................7-1
7.1 GTN 6XX/7XX ..........................................................................................................................7-2
7.2 GMA 35......................................................................................................................................7-8
7.3 Configuration Module ..............................................................................................................7-12
7.4 Interfaced Equipment ...............................................................................................................7-13
7.5 Enabled Features ......................................................................................................................7-26
8 RETURN TO SERVICE PROCEDURE .........................................................................................8-1
8.1 Maintenance Records .................................................................................................................8-1
APPENDIX A AIRCRAFT-SPECIFIC INFORMATION..................................................................A-1
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page iii
LIST OF FIGURES
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2-5
Figure 3-1
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
Figure 3-10
Figure 3-11
Figure 3-12
Figure 3-13
Figure 3-14
Figure 3-15
Figure 3-16
Figure 3-17
Figure 3-18
Figure 4-1
Figure 5-1
Figure 5-2
Figure 6-1
Figure 6-2
Figure 6-3
Figure 6-4
Figure 6-5
Figure 6-6
Figure 6-7
Figure 6-8
Figure 6-9
Figure 6-10
Figure 6-11
Figure 6-12
Figure 6-13
Figure 6-14
Figure 6-15
Figure 6-16
Figure 7-1
Figure 7-2
Figure 7-3
Figure 7-4
Figure 7-5
Figure 7-6
GMA 35 Connector Layout Detail - Rear View ...................................................................2-4
GMA 35c Bluetooth Connector Layout Detail - Front View ...............................................2-4
GTN 650 Connector Layout Detail - Rear View ..................................................................2-5
GTN 750 Connector Layout Detail - Rear View ..................................................................2-5
GTN System Interface Diagram ...........................................................................................2-7
GTN 6XX Normal Mode Screen ..........................................................................................3-2
GTN 7XX Normal Mode Screen ..........................................................................................3-2
GTN Software Updater .........................................................................................................3-3
System and Software Version ...............................................................................................3-4
GTN Software Loader Card Formatting ...............................................................................3-4
Update Progress Window .....................................................................................................3-5
Update Completion ...............................................................................................................3-5
GTN 6XX and GTN 7XX Configuration Mode Pages ........................................................3-8
GTN 7XX Updates Page ......................................................................................................3-9
System Information Page ....................................................................................................3-10
GTN 7XX Setup Pages .......................................................................................................3-11
GTN 7XX Options Pages ...................................................................................................3-13
GTN 7XX TAWS Configuration Page ...............................................................................3-14
Chart Configuration Page ...................................................................................................3-15
COM Transmit Power Configuration Page ........................................................................3-15
Weather Radar Page ...........................................................................................................3-16
Search and Rescue Configuration Page ..............................................................................3-17
GTN 6XX and 7XX Diagnostics Pages ..............................................................................3-18
TVS Assembly Check .........................................................................................................4-10
Failure Screen .......................................................................................................................5-6
GMA 35 Failure Annunciation ...........................................................................................5-27
GTN 7XX Mounting Rack Assembly ..................................................................................6-3
GTN 6XX Mounting Rack Assembly ..................................................................................6-4
GMA 35 Mounting Rack Assembly Overview ....................................................................6-7
GMA 35c Mounting Rack Assembly Overview ..................................................................6-8
Flight Stream Assembly Overview .....................................................................................6-10
Backshell Assembly (Potted Configuration Module) .........................................................6-13
Backshell Assembly (Configuration Module with Spacer) ................................................6-14
Fan/Backplate Orientation (GTN 7XX) .............................................................................6-15
Fan Wiring Replacement ....................................................................................................6-17
TVS/Fuse Replacement (TVS1/F1) ....................................................................................6-19
Detail of TVS Pin Assembly ..............................................................................................6-20
TVS2 Assembly ..................................................................................................................6-21
GPS/SBAS Antenna Cable Overbraid ................................................................................6-23
WXR HSDB Cable Overbraid Details ...............................................................................6-25
Instrument Panel Bonding ..................................................................................................6-26
Flight Stream Bonding ........................................................................................................6-28
Audio Panel Page ..................................................................................................................7-8
Main Indicator (Analog) Configuration Page .....................................................................7-13
VOR/LOC/GS Configuration Page ....................................................................................7-14
XPDR1 Configuration Page ...............................................................................................7-20
Audio Configuration Page ..................................................................................................7-26
Terrain Configuration Page ................................................................................................7-26
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page iv
LIST OF TABLES
Table 1-1
Table 3-1
Table 4-1
Table 5-1
Table 5-2
Table 5-3
Table 5-4
Table 5-5
Table 5-6
Table 5-7
Table 5-8
Table 5-9
Table 5-10
Table 5-11
Table 5-12
Table 5-13
Table 5-14
Table 5-15
Table 6-1
Table 6-2
Table 6-3
Table 6-4
Table 6-5
Table 6-6
Table 6-7
Table 6-8
Table 7-1
Table 7-2
Table 7-3
Table 7-4
Recommended Documents ..................................................................................................1-4
GTN Database Summary ...................................................................................................3-20
Periodic Maintenance ..........................................................................................................4-3
GTN Troubleshooting Guide ...............................................................................................5-2
Alert Text Troubleshooting Guide ......................................................................................5-7
COM Alert Troubleshooting Guide ..................................................................................5-11
GPS/SBAS Alert Troubleshooting Guide .........................................................................5-13
VLOC/GS Alert Troubleshooting Guide ..........................................................................5-14
Remote Transponder Alert Troubleshooting Guide ..........................................................5-15
GAD 42 Alert Troubleshooting Guide ..............................................................................5-17
Traffic Alert Troubleshooting Guide ................................................................................5-17
Datalink Alert Troubleshooting Guide ..............................................................................5-18
Weather Radar Alert Troubleshooting Guide ...................................................................5-20
TAWS Alert Troubleshooting Guide ................................................................................5-21
Third-Party Sensor Alert Troubleshooting Guide .............................................................5-22
Flight Stream Troubleshooting ..........................................................................................5-24
GMA 35 Troubleshooting .................................................................................................5-26
Remote Audio Panel Alert Troubleshooting Guide ..........................................................5-27
Self-Test Values ..................................................................................................................6-5
Configuration Module Wire Color Reference Chart .........................................................6-12
Configuration Module Kit P/N 011-00979-03 (P1001) ....................................................6-13
Configuration Module Kit P/N 011-00979-00 (P1001) ....................................................6-14
Fan Kit ...............................................................................................................................6-16
Fan Cable Wire Color Reference Chart ............................................................................6-16
Instrument Panel Bonding Hardware ................................................................................6-26
Flight Stream Bonding Hardware ......................................................................................6-28
Configuration and Checkout Procedures .............................................................................7-2
Summary of COM RX Squelch Settings and Auto Squelch Levels ...................................7-6
COM Carrier Squelch Selections ........................................................................................7-6
COM Carrier Squelch Selections ........................................................................................7-6
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page v
1 INTRODUCTION
1.1
1.2
1.3
1.4
1.5
Content, Scope, and Purpose .............................................................................................. 1-2
Organization........................................................................................................................ 1-2
Definitions and Abbreviations ............................................................................................ 1-3
Publications......................................................................................................................... 1-4
Distribution ......................................................................................................................... 1-4
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 1-1
1.1 Content, Scope, and Purpose
This document provides Instructions for Continued Airworthiness (ICA) and Maintenance Manual (MM)
for the GTN 6XX/7XX and GMA 35 as installed under STC SA02019SE-D. This document satisfies the
requirements for continued airworthiness, as defined by 14 CFR Part 23.1529 and 14 CFR Part 23
Appendix G. Information in this document is required to maintain the continued airworthiness of the
GTN 6XX/7XX, GMA 35/35c, Flight Stream 210, and Flight Stream 510.
1.2 Organization
The following outline briefly describes the organization of this manual:
Section 2: System Description
Provides a description of the equipment installed by STC SA02019SE-D. An overview of the GTN,
GMA 35, Flight Stream 210, and Flight Stream 510 system interfaces are provided.
Section 3: Control and Operation
Presents basic control and operation information related to maintenance of the GTN 6XX/7XX,
GMA 35/35c, Flight Stream 210, and Flight Stream 510.
Section 4: Instructions for Continued Airworthiness
Provides Instructions for Continued Airworthiness of the GTN, GMA 35, Flight Stream 210, and
Flight Stream 510 systems.
Section 5: Troubleshooting
Provides troubleshooting information to aid in diagnosing and resolving potential problems with the GTN,
GMA 35, Flight Stream 210, and Flight Stream 510 equipment.
Section 6: Equipment Removal and Re-installation
Provides instructions for the removal and re-installation of the GTN, GMA 35, Flight Stream 210, and
Flight Stream 510 equipment.
Section 7: Equipment Configuration and Testing
Provides instructions for configuration and testing of the GTN, GMA 35, Flight Stream 210, and
Flight Stream 510 equipment.
Section 8: Return to Service Procedure
Specifies return to service procedures required after completion of maintenance of the GTN, GMA 35,
Flight Stream 210, and Flight Stream 510 equipment.
Appendix A: Aircraft-Specific Information
Provides a form to record aircraft-specific installation and configuration data for the GTN, GMA 35,
Flight Stream 210, and Flight Stream 510 equipment.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 1-2
1.3 Definitions and Abbreviations
Except where specifically noted, references made to the GMA 35 will apply to the GMA 35c.
The following terminology is used within this document:
AC
ADS-B
Alternating Current
LOI
Loss of Integrity
Automatic Dependent Surveillance
Broadcast
LRU
Line Replaceable Unit
Automatic Gain Control
MHz
Mega-Hertz
AGCS
Automatic Ground Clutter Suppression
NAV
Navigation
AHRS
Altitude and Heading Reference System
OBS
Omni Bearing Selector
AGC
AML
Approved Model List
PA
Passenger Address
BIT
Built-In Test
PED
Portable Electronic Device
CDI
Course Deviation Indicator
PTC
Push-to-Command
CFR
Code of Federal Regulations
PTT
Push-to-Talk
COM
Communications
PVT
Position, Velocity, Time
CRG
Cockpit Reference Guide
R/T
Radar Transceiver
CSA
Conflict Situational Awareness
RF
Radio Frequency
DME
Distance Measuring Equipment
RMI
EFIS
Electronic Flight Instrument System
EHSI
Electronic Horizontal Situation Indicator
FIS-B
Flight Information Services Broadcast
FPGA
Field-Programmable Gate Array
G/S
RX
SAR
SBAS
SDI
Radio Magnetic Indicator
Receive
Search and Rescue
Satellite Based Augmentation System
Source/Destination Identifiers
Glideslope
SSM
Sign/Status Matrix
GAD
Garmin Interface Adapter
STC
Supplemental Type Certificate
GDL
Garmin Datalink
TAS
Traffic Advisory System
GMA
Garmin Audio Panel
TCAS
Traffic Collision Avoidance System
GNS
Garmin Navigation System
TAWS
Terrain Awareness System
GPS
Global Position System
TCAD
Traffic Collision Avoidance Device
GSR
Garmin Services
GTN
GWX
HSDB
TIS
Traffic Information Service
Garmin Touch Navigator
TSO
Technical Standard Order
Garmin Weather Radar
TVS
Transient Voltage Suppressor
High-Speed Data Bus
TX
Transmit
ICA
Instructions for Continued Airworthiness
UTC
Coordinated Universal Time
ICS
Intercom System
VDC
Volts Direct Current
IFR
Instrument Flight Rules
VFR
Visual Flight Rules
ILS
Instrument Landing System
VHF
Very High Frequency
IRU
Inertial Reference Unit
VOR
VHF Omni-Directional Range
LED
Light Emitting Diode
LOC
Localizer
WAAS
WXR
XPDR
190-01007-A1
Rev. 11
Wide Area Augmentation System
Weather Radar
Transponder
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 1-3
1.4 Publications
When performing system maintenance on the GTN, GMA, or Flight Stream, it is recommended that the
following documents be made available:
Table 1-1 Recommended Documents
Part Number
Garmin Document
005-00533-C0
Master Drawing List, GTN 6XX/7XX Part 23 AML STC
005-00533-C1
Equipment List, GTN 6XX/7XX Part 23 AML STC
190-01007-03
GTN 725/750 Pilot’s Guide
190-01007-A2
Supplemental Airplane Flight Manual for the Garmin GTN 6XX/7XX
GPS/SBAS Navigation System
190-01007-A5
Supplemental Airplane Flight Manual for the Garmin GTN 6XX/7XX
GPS/SBAS Navigation System (GPS Functions Not Approved for IFR
Navigation)
190-01007-A3
GTN 6XX/7XX Part 23 AML STC Installation Manual
190-01007-E1
GTN 6XX/7XX Part 23 Installation Checklist
190-01007-F0 [1]
Guideline for GTN Flight Plan and User Waypoint Files
Notes:
[1] Contact Garmin technical support for a copy of this document.
1.5 Distribution
This document is required for maintaining the continued airworthiness of the aircraft. When this document
is revised, every page will be revised to indicate current revision level. Garmin Dealers may obtain the
latest revision of this document at the Garmin Dealer Resource website.
Dealers are notified of manual revision changes via a Garmin Service Bulletin.
Owner/operators may obtain the latest revision of this document at flyGarmin.com or by contacting a
Garmin dealer. Garmin contact information is available at flyGarmin.com.
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 1-4
2 SYSTEM DESCRIPTION
2.1 Equipment Descriptions...................................................................................................... 2-2
2.1.1 GTN 6XX/7XX Navigators and GMA 35 .................................................................... 2-2
2.1.2 NAV Antenna Cable Splitter ........................................................................................ 2-3
2.1.3 NAV Antenna Cable Diplexer ...................................................................................... 2-3
2.2 Backplate Connectors ......................................................................................................... 2-4
2.3 GTN Optional Interfaces .................................................................................................... 2-6
2.4 GTN Block Diagram........................................................................................................... 2-7
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 2-1
2.1 Equipment Descriptions
2.1.1
GTN 6XX/7XX Navigators and GMA 35
NOTE
For pinouts and wiring diagrams, refer to GTN 6XX/7XX Part 23 AML STC Installation
Manual (P/N 190-01007-A3).
The GTN SBAS navigators are a family of aviation panel-mounted retrofit products. The following
sections will describe the available functions for each unit in the GTN 6XX/7XX navigators.
2.1.1.1 GTN 6XX
The GTN 6XX SBAS navigators are a family of panel-mounted GPS/NAV/COM navigators. “GTN 6XX”
includes the GTN 625, GTN 635, and GTN 650. They are 6.25 inches wide and
2.65 inches tall. The GTN 6XX features a 600 by 266 pixel color LCD touchscreen. The GTN 625 is a
GPS/SBAS unit that meets the requirements of TSO-C146c and may be approved for IFR en route,
terminal, oceanic, non-precision, and precision approach operations when installed in accordance with the
instructions in the manuals referenced in the GTN AML STC. The GTN 635 includes all of the features of
the GTN 625 and an airborne VHF/COM transceiver. The GTN 650 includes all of the features of the
GTN 625, an airborne VHF/COM transceiver, airborne VOR/localizer (LOC) receiver, and glideslope
(G/S) receiver.
2.1.1.2 GTN 7XX
The GTN 7XX SBAS navigators are a family of GPS/NAV/COM aviation panel-mounted products.
“GTN 7XX” includes the GTN 725 and GTN 750. GTN 7XX units are 6.25 inches wide and 6.00 inches
tall. They feature a 600 by 708 pixel color LCD touchscreen. The GTN 725 is a GPS/SBAS unit that meets
the requirements of Technical Standard Order TSO-C146c and may be approved for IFR en route,
terminal, oceanic, non-precision, and precision approach operations when installed in accordance with the
instructions in the manuals referenced in the GTN AML STC. The GTN 750 includes all of the features of
the GTN 725, an airborne VHF communications transceiver, and airborne VOR/localizer (LOC) and
glideslope (G/S) receivers. The GTN 725 and GTN 750 have the ability to remotely control GMA 35 audio
panel functions.
2.1.1.3 GMA 35 Audio Panel
The GMA 35 Audio Panel is a remote-mounted marker beacon receiver and an audio panel with a sixposition intercom system (ICS) that interfaces to the communications and navigation radios, headsets,
microphones, and speakers. The ICS includes electronic cabin noise de-emphasis, two stereo music inputs,
and independent pilot/copilot/passenger volume controls. The intercom provides three selectable isolation
modes. A pilot-selectable cabin speaker output can be used to listen to the selected aircraft radios or to
broadcast PA announcements.
The audio panel relies on the GTN 725 or GTN 750 to control and display the audio functions. The
GMA 35 interfaces to the GTN 7XX through RS-232 for control and display of audio panel functions.
The GMA 35c provides the functionality of the GMA 35, with the capability to pair Bluetooth™ audio
sources. This enables the distribution of audio to ICS positions when using a compatible iOS or Android™
device. The GMA 35c supports up to ten stored devices and one active Bluetooth device.
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
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2.1.1.4 Flight Stream 210
The Flight Stream 210 interfaces to the GTN 6XX/7XX through RS-232 for attitude information, flight
plan information, and GPS PVT. The information displays on a portable electronic device (PED). The
Flight Stream interfaces to the GDL 88 through RS-422 and the GDL 69 through RS-232.
NOTE
Only one Flight Stream system should be installed per aircraft.
NOTE
Flight Stream supports connection to one navigator at a time.
2.1.1.5
Flight Stream 510
NOTE
The Flight Stream 510 is a wireless-enabled data card that is inserted into the GTN data
card slot.
The Flight Stream 510 interfaces to the GTN 6XX/7XX by replacing the front-loaded data card to allow
wireless database synchronization with PEDs. Synchronized information is then disseminated to various
LRUs through their existing GTN interface connections.
2.1.2 NAV Antenna Cable Splitter
The navigation antenna cable splitter (Garmin P/N 013-00112-00) is used for installations involving dual
VHF navigation capable GTNs or a single VHF navigation capable GTN installation with a second
non-Garmin aviation unit.
2.1.3 NAV Antenna Cable Diplexer
GTN 650/750 navigation units have a single navigation antenna port and require a composite signal for
installations that include separate VOR/LOC and G/S antennas. The navigation diplexer (Comant diplexer
VOR/GS, Model CI-507) is used for these installations.
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2.2 Backplate Connectors
Figure 2-1 GMA 35 Connector Layout Detail - Rear View
FRONT OF UNIT
J3504
GMA35c ONLY
Figure 2-2 GMA 35c Bluetooth Connector Layout Detail - Front View
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Figure 2-3 GTN 650 Connector Layout Detail - Rear View
Figure 2-4 GTN 750 Connector Layout Detail - Rear View
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2.3 GTN Optional Interfaces
Optional equipment interfaces include:
 Audio panel

Air data computer

Altitude serializer or fuel/air data computers

Autopilot

EFIS displays

EHSI displays

IRU/AHRS

Navigation indicators

Weather, traffic, terrain systems

DME

CDI/HSI source selection annunciators

TAWS annunciator panels

Multifunction displays

Interface adapters

Synchro heading sources

Weather radar

Garmin Iridium transceiver

Garmin ADS-B traffic and FIS-B weather sources

Garmin Flight Stream
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2.4 GTN Block Diagram
GTN 6XX/7XX
CONNECTOR P1001
AIRCRAFT POWER & GROUND
AIRCRAFT LIGHTING BUS
EXTERNAL INSTRUMENTATION
POWER & GROUND
LAT DEVIATION & FLAGS
MAIN CDI/HSI
(GPS/VOR/ILS)
TO/FROM
LIGHTING BUS
TIME MARK OUT
VERT DEVIATION & FLAGS
SUPERFLAGS
STORMSCOPE
MAIN OBS
RS-232 IN
RS-232 OUT
ARINC 429 IN
FUEL/AIR DATA
OR
SERIALIZER
SWITCHES/
ANNUNCIATORS
SWITCHES
ARINC 429 IN
ANNUNCIATORS
ARINC 429 OUT
FLIGHT CONTROL
SYSTEM
TRAFFIC
DISCRETES
RS-232 IN
ILS/GPS APPROACH
RS-232 OUT
EXTERNAL MAP
DISPLAY
RS-232 IN
TRANSPONDER
LAT DEVIATION & FLAGS
VERT DEVIATION & FLAGS
SUPERFLAGS
RS-232 OUT
GNS 400W/500W
SERIES CROSSFILL
RS-232 OUT
RS-232 OUT
RS-232 IN
RS-232 OUT
GARMIN
GTN 6XX/7XX
(CROSSFILL)
FLIGHT STREAM
210
RS-232 IN
RS-232 IN
RS-232 IN
GSR 56
RS-232 OUT
GTN 6XX/7XX
CONNECTOR P1002
ETHERNET IN
ETHERNET OUT
DISCRETES
GARMIN
WEATHER RADAR
ETHERNET IN
ETHERNET OUT
ETHERNET IN
ETHERNET OUT
OTHER GARMIN LRUs
(GTN 7XX ONLY)
GTN 635/650/750
CONNECTOR P1003
AIRCRAFT POWER & GROUND
POWER & GROUND
AUDIO PANEL
COM MIC KEY
COM MIC AUDIO
COM AUDIO
ANALOG AUDIO
COM REMOTE TRANSFER
COM REMOTE TRANSFER SWITCH
COM REMOTE TUNE UP
COM REMOTE TUNE
SWITCHES
COM REMOTE TUNE DOWN
GTN 650/750
CONNECTOR P1004
VLOC AUDIO
(GMA 35 ONLY)
CDI/HSI
(VOR/ILS ONLY)
LAT DEVIATION & FLAGS
RMI
AIRCRAFT POWER & GROUND
TO/FROM
VERT DEVIATION & FLAGS
SUPERFLAGS
VOR OBI
POWER & GROUND
NAV ILS ENERGIZE
ARINC 429
EFIS/EHSI
PARALLEL TUNED
DME
VOR OBS
VLOC COMPOSITE OUT
NAV ARINC 429 IN
NAV ARINC 429 OUT
SERIAL DME CLOCK/DATA
PARALLEL DME TUNING
NAV REMOTE TRANSFER
KING SERIAL
TUNED DME
DME REQUEST COMMON
NAV REMOTE TRANSFER SWITCH
NAV DME COMMON
GTN 6XX/7XX
CONNECTOR P1006
GPS/SBAS ANTENNA
GTN 635/650/750
CONNECTOR P1007
COM ANTENNA
GTN 650/750
CONNECTOR P1008
NAV ANTENNA
Figure 2-5 GTN System Interface Diagram
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3 CONTROL AND OPERATION
3.1 GTN Normal Mode Overview ............................................................................................ 3-2
3.2 Software Loading................................................................................................................ 3-3
3.2.1 GTN Software Loader Card Creation ........................................................................... 3-3
3.2.2 GMA 35 Boot Block Loading ...................................................................................... 3-6
3.2.3 GMA 35 Software Loading .......................................................................................... 3-7
3.3 GTN Configuration Mode Overview.................................................................................. 3-8
3.3.1 GTN Software Updates................................................................................................. 3-9
3.3.2 System Information..................................................................................................... 3-10
3.3.3 GTN Setup Page ......................................................................................................... 3-11
3.3.4 GTN Options Page...................................................................................................... 3-13
3.3.5 GTN Diagnostics Page................................................................................................ 3-18
3.4 Database Updates.............................................................................................................. 3-20
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3.1 GTN Normal Mode Overview
Figure 3-1 GTN 6XX Normal Mode Screen
Figure 3-2 GTN 7XX Normal Mode Screen
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3.2 Software Loading
3.2.1
GTN Software Loader Card Creation
CAUTION
In order to create a GTN Software Loader Card, the drive that you select will be
completely erased.
NOTE
The application to create the GTN Software Loader Card performs on PCs with
Windows 2000, XP, Vista, Windows 7, and Windows 10. There is no Macintosh support at
this time.
NOTE
An SD card reader is needed to create the GTN Software Loader Card using the
application that is downloaded from Garmin. The approved readers are SanDisk®
SDDR-999 and SDDR-93, although other SD card readers may work.
NOTE
It is recommended to use an SD card with capacity of 2 GB or smaller for loading GDU
software. If a card larger than 2 GB is used, a version mismatch error will display after
files have finished loading. Load software again after cycling power on the GDU or the
update may be incomplete.
A GTN Software Loader Card is created using GTN downloadable software and an SD card with a GTN
software application downloaded from the Dealer Resource Center on Garmin’s website. The Dealer
Resource Center will allow the technician to choose which software package(s) to load onto the card.
Create a GTN Software Loader Card as follows:
1. Go to the Dealer Resource Center on Garmin’s website.
2. Download the GTN Software Loader Image. Refer to Equipment List, GTN 6XX/7XX Part 23 AML
STC for the correct Software Loader Image part number.
3. Ensure that you have an SD card reader connected to the PC. Insert the GTN Downloadable
Software SD Card into the card reader.
4. Run the executable file.
Figure 3-3 GTN Software Updater
5. Click Setup.
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Figure 3-4 System and Software Version
6. Click Next.
Figure 3-5 GTN Software Loader Card Formatting
7. Ensure that the correct drive is selected.
8. Click Next to create the card.
9. Click Next to acknowledge any warnings that may appear.
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Figure 3-6 Update Progress Window
10. Click Finish to complete the update process.
Figure 3-7 Update Completion
11. Eject the card from the card reader (or stop the card reader in Windows). The GTN Software
Loader Card is now ready to use.
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3.2.2
GMA 35 Boot Block Loading
NOTE
The GMA 35 Boot Block Loader Card is separate from the GMA 35 Software Loader Card
and is required to update Boot Block software to v4.10. For instructions on creating the
GMA 35 Software Loader Card, refer to Section 3.2.3. GTN main software v6.11 (or later)
is required for GMA 35 Boot Block v4.10 (or later).
1. Remove power from the GTN 7XX.
2. Insert the GTN Boot Block Loader Card into the GTN 7XX data card slot. For instructions on how
to create a GTN Boot Block Loader Card, refer to Section 3.2.1.
3. Apply power to the GTN 7XX.
4. Ensure the GMA 35 circuit breaker is closed.
5. Select all GMA 35 Boot Block updates.
6. To begin the software update, touch the Update key on the bottom of the display.
7. The GTN will display the prompt, “Start GMA 35 Software Updates?”
8. To allow the GTN to update the GMA 35, touch OK.
9. When updates complete, the GTN will display, “Update Complete!”
10. Turn the GTN and GMA 35 off by opening the circuit breaker.
11. Remove the Boot Block Loader Card.
12. Re-insert the database card in the data card slot.
13. Restore power on the GTN and GMA 35 by closing the circuit breakers.
14. To ensure the software correctly updated, go to the System Information page and select the
GMA 35. Refer to Section 3.3.2 for more information on the System Information page.
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3.2.3
GMA 35 Software Loading
NOTE
The GMA 35 software will be present on the SD card when creating a GTN Software
Loader Card. A separate card is not required to perform GMA 35 software updates.
1. Remove power from the GTN 7XX by opening the circuit breaker.
2. Insert the GTN Software Loader Card into the GTN 7XX data card slot. For instructions on how to
create a GTN Software Loader Card, refer to Section 3.2.1.
3. Hold down the HOME key until “Garmin” is fully lit on the display after power is applied by
closing the circuit breaker for the GTN 7XX.
4. Ensure the GMA 35 circuit breaker is closed.
5. The Configuration Mode page should now be displayed. Touch the Updates key to display
available software.
6. To select GMA 35 software updates, touch the GTN Software Updates key and select GMA 35
Software Updates.
7. To update the GMA 35 with all available software, touch Select All.
8. Touch the Update key.
9. The GTN will display the prompt, “Start GMA 35 Software Updates?”
10. Touch OK to allow the GTN to update the GMA 35.
11. When the updates are complete, the GTN will display, “Update Complete!”
12. Turn the GTN and GMA 35 off (i.e., open the circuit breaker) and remove the Software Loader
Card.
13. Re-insert the database card in the data card slot.
14. Restore power on the GTN and GMA 35 by closing the circuit breakers and ensure the software
was updated correctly by going to the System Information page and selecting the GMA 35. Refer
to Section 3.3.2 for more information on the System Information page.
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3.3 GTN Configuration Mode Overview
NOTE
When configuring the GTN, ensure that configuration module service messages are not
displayed in the message queue. This indicates an improperly wired or damaged
configuration module.
Configuration mode is used to configure the GTN settings for each specific installation. To access
Configuration mode, perform the following steps:
1. Remove power from the GTN by opening the circuit breaker.
2. Press and hold the HOME key and reapply power to the GTN.
3. Release the HOME key when the display activates and “Garmin” appears fully lit on the screen.
The Configuration Mode page is the first page displayed. For detailed information regarding how to
configure the GTN, refer to GTN 6XX/7XX Part 23 AML STC Installation Manual. While in Configuration
mode, select pages by touching the desired key on the display. Some pages may require page scrolling to
view all of the information and keys. Scrolling is done by touching the screen and dragging the page in the
desired direction or by touching the Up or Down keys.
NOTE
The configuration pages shown reflect main software version 3.00. Some differences in
operation may be observed when comparing information in this manual to later software
versions.
Figure 3-8 GTN 6XX and GTN 7XX Configuration Mode Pages
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3.3.1
GTN Software Updates
NOTE
The following steps will need to be repeated for each replacement GTN unit that requires a
software update.
To update the GTN software, perform the following steps:
1. Remove power from the GTN by opening the circuit breaker.
2. Remove the database card and insert the correct GTN Software Loader Card into the data card slot.
Refer to Section 3.2.1 for creating a GTN Software Loader Card.
3. Restore power to the GTN by closing the circuit breaker.
4. The GTN is now in Configuration mode, as shown in Figure 3-8. Touch Updates to display the
available software updates.
5. Check that the software version being loaded to the GTN matches the software version listed in
Equipment List, GTN 6XX/7XX Part 23 AML STC. The Updates page displays the version that is
installed on the unit and the version installed on the loader card.
6. Check that the available GTN software updates are displaying by ensuring that GTN Software
Updates key is highlighted in the upper-left corner (upper-right for GTN 6XX) of the display.
7. To update the GTN with all available software, touch Select All.
8. To begin the software update, touch Updates on the bottom of the display.
9. The GTN will display the prompt, “Start GTN Software Updates?”
10. Touch OK to allow the GTN to go through the update process.
11. When the updates are complete, the GTN will display, “Update Complete!”
12. Remove power from the GTN and remove the Software Loader Card. Re-insert the database card
into the data card slot.
Figure 3-9 GTN 7XX Updates Page
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3.3.2 System Information
View the System Information page by touching the System Information key on the Configuration Mode
page. The System Information page displays the unit type, serial number, and system ID for the GTN. It
contains the software and hardware versions of the Main, I/O, Display, Keypad, LED, GPS/WAAS, COM,
and NAV boards. System information is available for certain other LRUs connected to the GTN. Touch the
GTN key and choose which LRU to display. Touch UP or DOWN to view all the information.
Figure 3-10 System Information Page
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3.3.3 GTN Setup Page
This section provides a brief overview of the pages that are accessed from the GTN Setup page. To access
the GTN Setup page, touch the GTN Setup key from the Configuration Mode page, as shown in
Figure 3-8.
Figure 3-11 GTN 7XX Setup Pages
ARINC 429
This allows the user to configure the ARINC 429 input and output ports on the GTN. Both ARINC 429
formats and bus speeds are set from this configuration page.
RS-232
This allows the user to configure the RS-232 input and output ports on the GTN.
HSDB (Ethernet)
This allows the user to set which Ethernet ports are connected.
Interfaced Equipment
This allows the user to configure which LRUs are installed and interfaced to the GTN. The transponder
selection is automatically configured when a valid transponder configuration is selected on the RS-232
page.
Main Indicator (Analog)
This allows the user to calibrate the OBS resolver and configure the CDI key, selected course for GPS,
VLOC, and the V-Flag state.
Lighting
This allows the user to set the backlight and key lighting brightness display parameters.
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Enhanced Lighting
This replaces the Lighting page when enabled under the Main System Configuration page. Enhanced
lighting allows the user to set the backlight and key lighting brightness display parameters. Enhanced
lighting is used to configure separate Day/Night lighting curves.
Audio
This allows the user to configure the aural alert volume.
Traffic
This allows the user to configure the traffic intruder symbol color and configure whether or not the GTN
controls the traffic system.
Main System
This page allows the user to display miscellaneous configuration options for the GTN. Page settings
include the following:
 Air/Ground Threshold
 Air/Ground Discrete
 Fuel Type
 Heading Source Input
 Altitude Source Input
COM
This allows the user to configure the RF squelch volume, Mic 1 Gain, and sidetone volume. These
selections are only available for the GTN 635, 650, and 750 units.
VOR/LOC/GS
This allows the user to check the CDI outputs from the VOR/LOC/GS receiver and the OBS resolver input
to the VOR receiver. It is used to format the DME tuning data. The VOR/LOC/GS page is only available
for the GTN 650 and 750 navigation units.
ARINC 708
This allows the user to configure the GTN ARINC 708 input port. Selection of one of the approved
ARINC 708 weather radars is only possible if the digital radar enablement is active. This setting is only
available for the GTN 725 and 750 navigation units.
Discretes
This allows the user to customize the configuration of discrete inputs/outputs on the J1001 and J1002
connectors.
Waypoints
These settings are not used in this STC.
Ownship
This allows the user to select the displayed ownship icon from a list.
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3.3.4
GTN Options Page
NOTE
For first time feature enablement, refer to GTN 6XX/7XX Part 23 AML STC Installation
Manual for additional requirements and checkout procedures. This manual only describes the
necessary steps to re-enable the feature for existing installations. All re-enablements use the
feature enablement card from initial installation.
NOTE
Feature enablement cards should be provided to the customer after service has been
completed.
Figure 3-12 GTN 7XX Options Pages
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3.3.4.1
TAWS B Enablement
NOTE
When the Terrain Alerting feature is enabled, the GTN will provide a subset of the
TAWS B functionality, but does not meet the requirements of TSO-C151c.
When the optional TAWS feature is enabled, the GTN will provide Class B TAWS functionality. This
section describes how to reactivate the TAWS feature in the GTN.
1. Turn the GTN off by opening the NAV/GPS circuit
breaker.
2. Remove the database SD card from the data card slot
and insert the TAWS Enablement Card
(P/N 010-00878-01).
3. Enter Configuration mode by applying power
(i.e., closing the circuit breaker) to the GTN while
holding the HOME key.
4. Navigate to the Terrain Configuration page from the
GTN Options page. Touch the TAWS B key.
When the TAWS feature is activated, the TAWS B key will be
lit green, as shown in Figure 3-13.
3.3.4.1.1 TAWS-B Configuration Options
When TAWS B is enabled, as shown in Figure 3-13, the
following configuration settings may be accessed.
Figure 3-13 GTN 7XX TAWS
Configuration Page
Audio Clips
This allows the user to select aural alert messages for various caution and warning types.
Alert Settings
The GTN TAWS alerting algorithm adapts the terrain alerting criteria based on nearby airports. The Alert
Settings configuration options allow the user to select the minimum criteria that the airport must meet to be
considered as a nearby airport for the purpose of TAWS alerting. Refer to Section 7.5.1 for additional
details.
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3.3.4.2 ChartView™ Enablement (GTN 7XX Only)
The GTN 7XX displays Jeppesen charts using the optional
ChartView feature, when activated. To configure which Charts
to display, touch either None, FliteCharts, or ChartView. If
ChartView is selected, it must be enabled as described below:
1. Turn the GTN off by opening the NAV/GPS circuit
breaker.
2. Remove the database SD card from the data card slot
and insert the ChartView Enablement Card
(P/N 010-00878-40).
3. Enter Configuration mode on the GTN by applying
power to the GTN (i.e., closing the circuit breaker)
while holding the HOME key.
4. Navigate to the Charts page from the GTN Options
page. Touch the ChartView key.
5. When the ChartView feature is activated, the
ChartView key will be lit green, as shown in
Figure 3-14.
Figure 3-14 Chart Configuration
Page
3.3.4.3 COM Transmit Power Enablement
When the optional 16W COM power is configured, the GTN
COM will transmit with 16 watts rather than the standard
10 watts. This section describes how to re-enable the 16W
COM transmit power.
1. Turn the GTN off by opening the NAV/GPS circuit
breaker.
2. Remove the database SD card from the data card slot
and insert the 16W Enablement Card
(P/N 010-00878-40).
3. Enter Configuration mode by applying power to the
GTN (i.e., closing the circuit breaker) while holding
the HOME key.
4. Navigate to the COM Transmit Power Configuration
page from the GTN Options page. Touch the 16W key.
5. When the 16W COM feature is activated, the 16W key
Figure 3-15 COM Transmit Power
will be lit green, as shown in Figure 3-15.
Configuration Page
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3.3.4.4 Digital Radar Enablement (GTN 7XX Only)
This section describes how to re-enable the Digital Radar
feature, which allows approved ARINC 708 weather radars
to be interfaced with the GTN 7XX.
1. Turn the GTN off by opening the NAV/GPS circuit
breaker.
2. Remove the database SD card from the data card slot
and insert the Digital Radar Enablement Card
(P/N 010-00878-42).
3. Enter Configuration mode on the GTN by applying
power to the GTN (i.e., closing the circuit breaker)
while holding the HOME key.
4. Go to the Weather Radar page from the GTN
Options page. Touch the Digital Radar key, as
shown in Figure 3-16.
5. When prompted, touch Yes to enable Digital
Weather Radars. When the feature is activated, the
Digital Radar key will be lit green.
Figure 3-16 Weather Radar Page
3.3.4.5 GWX 70/75 Advanced Features (GTN 7XX Only)
The GTN 7XX can enable two Doppler radar features for the GWX 70/75. A Radar Turbulence Detection
Card (P/N 010-00878-45 or 010-00878-47 (dual install)) is needed for Turbulence Detection and a Radar
Automatic Ground Clutter Suppression Enablement Card (P/N 010-00878-44 or 010-00878-46 (dual
install)) is needed for Ground Clutter Suppression.
To enable Radar Turbulence Detection:
1. Turn the GTN off by opening the NAV/GPS circuit breaker.
2. Remove the database SD card from the data card slot and insert the Radar Turbulence Detection
Enablement Card (P/Ns 010-00878-45 or 010-00878-47).
3. Enter Configuration mode on the GTN by applying power to the GTN (i.e., closing the circuit
breaker) while holding the HOME key.
4. Navigate to the Weather Radar page from the GTN Options page. Touch the Turbulence
Detection key, as shown in Figure 3-16.
5. When prompted, touch Yes to enable Turbulence Detection. When the feature is activated, the
Turbulence Detection key will be lit green.
To enable Ground Clutter Suppression:
1. Turn the GTN off by opening the NAV/GPS circuit breaker.
2. Remove the database SD card from the data card slot and insert the Radar AGCS Enablement Card
(P/Ns 010-00878-44 or 010-00878-46).
3. Enter Configuration mode on the GTN by applying power to the GTN (i.e., closing the circuit
breaker) while holding the HOME key.
4. Navigate to the Weather Radar page from the GTN Options page. Touch the Ground Clutter
Suppression key, as shown in Figure 3-16.
5. When prompted, touch Yes to enable Ground Clutter Suppression. When the feature is activated,
the Ground Clutter Suppression key will be lit green.
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3.3.4.6 Search and Rescue Features
The GTN 6XX/7XX can enable Search and Rescue features. A Search and Rescue Enablement Card
(P/N 010-00878-03) is needed for enablement.
To enable Search and Rescue features:
1. Turn the GTN off by opening the NAV/GPS circuit breaker.
2. Remove the database SD card from the data card slot and insert the Search and Rescue Enablement
Card (P/N 010-00878-03).
3. Enter the Configuration mode on the GTN by applying power to the GTN (i.e., closing the circuit
breaker) while holding the HOME key.
4. Go to the Search and Rescue Configuration page from the GTN Options page. Touch the Search
and Rescue key, as shown in Figure 3-17.
5. When prompted, touch the Yes key to enable Search and Rescue.
6. Select the Search and Rescue (SAR) patterns desired in the SAR patterns section of the options
page, as shown in Figure 3-17.
Figure 3-17 Search and Rescue Configuration Page
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3.3.5 GTN Diagnostics Page
The GTN Diagnostics page is accessed from the Configuration Mode home page and is a useful tool for
diagnosing issues and troubleshooting problems. Ground checks are performed using the tools on this
page.
Figure 3-18 GTN 6XX and 7XX Diagnostics Pages
ARINC Inputs
This displays the ARINC 429 data that is being received over each ARINC 429 port. Each port is chosen
for display by touching the Port key and toggling between the input ports. Select a port to display. The
GTN will then display the label, SSM, Data, and SDI for each ARINC 429 input port. This is useful for
determining if the expected labels are being received and for troubleshooting incorrect or swapped wiring
to the input ports. The data log can be paused by toggling the Pause key. Clear the data log by touching the
Clear Log key.
Serial Inputs
This displays the serial data that is being received and is useful for determining if the GTN is receiving
data on each connected port. Select the desired port by touching the Port key and selecting the RS-232
channel from the list. The data log can be paused by toggling the Pause key. Clear the data log by touching
the Clear Log key.
Discrete Inputs
This displays the state of each of the discrete input pins on the GTN. This page is useful for
troubleshooting discrete wiring issues.
Discrete Outputs
This displays the state of each of the discrete outputs and allows them to be toggled between Active and
Inactive. This is useful for ensuring that annunciator and signal outputs are properly connected to
annunciator lights or other LRUs, and that they are receiving the signal.
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HSDB Ethernet
This displays the status of each HSDB port to be displayed. This page displays whether or not each port is
receiving data and displays whether the port is connected or not connected. The communication status of
each installed HSDB LRU is displayed.
Main Indicator (Analog)
This displays the CDI connected to the main board (P1001) to be ground checked and allows the interface
to be verified.
Analog Inputs
This displays the bus voltage setting for Lighting Bus 1 and Lighting Bus 2 and the input voltage setting
for each bus. It displays synchro heading input diagnostics information, such as heading angle, heading
valid status, AC voltage, and AC frequency.
Power Stats
This displays the number of times the GTN has powered up and the total elapsed operating hours for the
GTN.
WAAS Diagnostics
This page displays the WAAS engine status, including UTC date/time, current Lat/Lon, overall navigation
status, oscillator temperature, and AGC voltage. This page allows the GPS/WAAS engine to be reset.
Temps
This page displays the current, minimum, maximum, and average board temperatures for the LED Board,
Main Board, Display Interface Board, GPS/WAAS Board, and COM Board.
Error Log
This page allows the error log to be written to the SD card in the front slot. It allows the error log to be
cleared.
Main Data Inputs
This page allows the data on ARINC 429, RS-232, and other electrical inputs to be monitored. This is used
for checking electrical interfaces during installation and troubleshooting. Information that is not being
received by the GTN is dashed out.
VOR/ILS Indicator (Analog)
This page allows the CDI connected to the NAV board (P1004) to be ground checked and allows the NAV
indicator interface to be verified.
COM Board Diagnostics Page
This page displays status of the FPGA flash, nonvolatile memory, synthesizer lock calibration, and
reversionary, as well as the transmitter power limit.
Clear Config Settings
CAUTION
This key should only be pressed if the intent is to clear all configuration settings. Touching
the Clear Config Settings key opens a confirmation window to reset all of the settings
stored in the configuration module to their defaults.
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3.4 Database Updates
CAUTION
The databases on the GTN Database Card are locked to specific GTN installations. The
first time the GTN Database Card is inserted into a GTN, it associates exclusively with
that particular GTN and will not work in other installations.
The GTN utilizes various databases. All databases are loaded to the GTN through the single data card that
is inserted into the vertical slot on the left side of the GTN. The Navigation, Basemap, Safetaxi, and
Obstacle databases are stored internally on the GTN. The Terrain, Flitecharts, and Chartview databases are
stored on the data card. Databases are updated by removing the database card from the GTN, updating the
database on the card, and re-inserting the card. Database updates can be applied in Normal mode at powerup. Alternatively, the databases can be updated in Configuration mode through the Updates page. The
GTN, by default, will only update to effective databases. If loading databases that are not yet effective, or
if the GTN GPS time is out-of-date, press and hold the dual-concentric knob during power-up to install all
database updates from the data card.
Databases can also be updated using a Flight Stream 510 wireless data card and a portable device. When
powering on in Normal mode with a Flight Stream 510 inserted into the data card slot, the GTN will
provide on-screen instructions on how to transfer databases from a portable device (with a compatible
application) over Wi-Fi.
Database cards and the Flight Stream 510 should not be swapped between GTNs if multiple units are
installed.
GTN users can update their database card by purchasing database subscription updates from Garmin.
Contact Garmin at (866) 739-5687 or go to flyGarmin.com for more information and instructions.
For a summary of the database location and update rate, refer to Table 3-1. The GTN Database Card
(Garmin P/N 010-00900-00) includes:
 Basemap
 Obstacle
 SafeTaxi
 Navigation
Table 3-1 GTN Database Summary
Database
Update Rate
Stored Location
Terrain Database
Periodic (when available)
Data card
FliteCharts Database
28 Days
Data card
ChartView Database
14 Days
Data card
Obstacle Database with Hotlines
56 Days
Internal
SafeTaxi Database
56 Days
Internal
Basemap Database
Periodic (when available)
Internal
Navigation Database
28 Days
Internal
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4 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS
4.1 Airworthiness Limitations .................................................................................................. 4-2
4.2 Servicing Information ......................................................................................................... 4-2
4.2.1 Periodic Maintenance ................................................................................................... 4-2
4.2.2 Special Tools................................................................................................................. 4-2
4.3 Maintenance Intervals......................................................................................................... 4-3
4.4 Visual Inspection ................................................................................................................ 4-5
4.5 Electrical Bonding Test ...................................................................................................... 4-6
4.5.1 GTN Bonding Check (Metallic or Tube-and-Fabric Aircraft) ..................................... 4-6
4.5.2 GTN (Composite Aircraft)............................................................................................ 4-6
4.5.3 GMA 35 (Metallic or Tube-and-Fabric Aircraft) ......................................................... 4-7
4.5.4 GMA 35 (Composite Aircraft) ..................................................................................... 4-8
4.5.5 Flight Stream 210 (Metallic or Tube-and-Fabric Aircraft)........................................... 4-8
4.5.6 Flight Stream 210 (Composite Aircraft) ....................................................................... 4-8
4.6 Transient Voltage Suppressor (TVS) (If Installed)............................................................. 4-9
4.6.1 GTN TVS1 Check (GTN #1 Only)............................................................................... 4-9
4.6.2 GTN TVS2 Assembly Check (GTN #1 Only)............................................................ 4-10
4.7 GPS/SBAS Antenna Cable Overbraid Inspection (If Installed) ....................................... 4-11
4.8 WXR HSDB Cable Overbraid Inspection (If Installed) ................................................... 4-11
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4.3 Maintenance Intervals
Table 4-1 Periodic Maintenance
Item
Description/Procedure
Interval
Removal and replacement of the following items. Refer to
Section 6 of this document for instructions.
Equipment Removal
and Replacement
• GTN 6XX/7XX, Flight Stream 210, Flight Stream 510, or
GMA 35 units
• NAV antenna cable splitter
• NAV antenna cable diplexer
• Fan
On Condition
Cleaning the Front
Panel
The front bezel, keypad, and display can be cleaned with a soft
cotton cloth dampened with clean water. DO NOT use any
chemical cleaning agents. Care should be taken to avoid
scratching the surface of the display.
On Condition
Display Backlight
The display backlight LEDs are rated by the manufacturer as
having a usable life of at least 36,000 hours. This life may be
more or less than the rated time depending on the operating
conditions of the GTN. Over time, the backlight lamp may dim
and the display may not perform as well in direct sunlight
conditions. The user must determine by observation when the
display brightness is not suitable for its intended use. Contact the
Garmin factory repair station when the backlight lamp requires
service.
On Condition
Battery
Replacement
The GTN has an internal keep-alive battery that will last about
10 years. The battery is used for GPS system information.
Regular planned replacement is not necessary. The GTN will
display a “low battery” message when replacement is required.
Once the low battery message is displayed, the battery should
be replaced within 1 to 2 months.
If the battery is not replaced and becomes totally discharged, the
GTN unit will remain fully operational, but the GPS signal
acquisition time may be increased. There is no loss of function or
accuracy of the GTN unit with a dead battery.
On Condition
The battery must be replaced by the Garmin factory repair
station or factory authorized repair station.
Test - Bonding
Check
Perform an electrical bonding check of the GTN, GMA 35
(if installed), and Flight Stream 210 (if installed) per Section 4.5.
Every 10
years or 2000
flight hours,
whichever
comes first
Test TVS Lightning
Protection
The GTN #1 main power input has a TVS located at the LRU, for
IFR non-metallic aircraft only. TVS1 and TVS2 must be
checked or replaced in accordance with Section 4.6.
24 Calendar
Months
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Item
Test Lightning
Protection
Description/Procedure
The GTN #1 main power input and NAV power input will have a
TVS located at the LRU, for IFR non-metallic aircraft only.
TVS1 and TVS2 must be replaced in accordance with
Section 6.9.
Conduct a visual check of the GPS/SBAS antenna cable
overbraid in accordance with Section 4.7.
Conduct a visual check of the WXR cable overbraid in
accordance with Section 4.8, if installed.
Visual Inspection
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Interval
After a
suspected or
actual
lightning
strike
The GTN unit, GMA 35 (if installed), Flight Stream 210 (if
installed), Flight Stream 510 (if installed), switches, and wiring
12 Calendar
harnesses should be inspected to ensure continued integrity of
the installation. These items must be inspected in accordance with Months
Section 4.4.
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4.4 Visual Inspection
CAUTION
Take care when tightening the mounting screws of the Flight Stream 210. Excessive
tightening may damage the mounting flange.
Conduct a visual check of the GTN unit(s), switches, GMA 35 (if installed), Flight Stream 210 or Flight
Stream 510 (if installed), and their wiring harnesses to ensure they continue to comply with STC
SA02019SE-D.
1. Inspect the GTN unit(s), GMA 35, and Flight Stream 210 for security of attachment, including
visual inspection of mounting racks and other supporting structure attaching the racks to aircraft
instrument panel.
 GTN 6XX/7XX - Verify the countersunk fastener heads are in full contact with the unit
mounting rack holes. Re-torque the mounting screws 12-15 in-lbf, if required
 GMA 35 - If the GMA 35 is installed, verify the countersunk fastener heads are in full contact
with the unit mounting rack holes. Re-torque the GMA 35 mounting screws to 8.5-9.5 in-lbf, if
required. For installations that use a hook and loop fastener to secure the GMA 35c Bluetooth
antenna mount, ensure the hook and loop bond is firm. If the hook and loop fastener is worn,
replace it
 Flight Stream 210 - If the Flight Stream 210 is installed, and screws are not securely attached,
tighten any loose Flight Stream 210 mounting screws (as necessary) to snug plus one-quarter
turn. If required, re-torque bonding strap hardware to 12-15 in-lbf
 Flight Stream 510 - Ensure the data card is properly oriented (label facing right), fully
inserted, and locked into position in the card slot on the front-left side of the GTN.
2. Inspect for corrosion.
3. Inspect switches, knobs, and buttons for damage.
4. Inspect condition of wiring, shield terminations, routing, and attachment/clamping.
5. Check the fan intake slots on the sides and bottom of the GTN unit’s bezel for dust, dirt, or
obstructions. Clean as needed.
6. Conduct a visual check of the GPS/SBAS antenna cable overbraid (if installed).
7. Conduct a visual check of the WXR cable overbraid (if installed).
8. Conduct a visual check of any bonding strap or conductive tape used for electrical bonding or RF
ground plane (if installed).
9. Replace any damaged or torn strap. Refer to Section 6.12 or Section 6.13 for details.
10. Replace any torn bonding tape using a heavy duty aluminum foil tape, such as 3M P/N 436 or 438
or another foil with aluminum that is 7.2 mils thick or greater. If strap termination hardware is
loose, tighten and re-test bonding. Refer to Section 4.5 for details.
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4.5 Electrical Bonding Test
4.5.1
GTN Bonding Check (Metallic or Tube-and-Fabric Aircraft)
NOTE
If the GMA 35 is installed (GTN 7XX only), it must be removed from its rack and the
GMA 35 backplate assembly must be removed prior to performing step 3. When a
GMA 35 bonding check is planned, perform the GMA 35 bonding check prior to
re-installing the GTN backplate assembly to the rack.
NOTE
A bonding test failure may occur if a fastener is not secured to the specified torque value.
For installations that use screws in lieu of rivets to secure the rack to surrounding
structure, verify that the screws are torqued to the appropriate value before proceeding to
remove the rack. Refer to Section 4.4 for torque values.
Perform an electrical bonding check as follows:
1. Remove the GTN 6XX or GTN 7XX from the mounting rack.
2. Remove the backplate assembly from the rack.
3. Measure the resistance between the mounting rack and nearby exposed portion of aircraft metallic
structure and verify it is less than or equal to 10 mΩ.
In the event of bonding test failure, remove the GTN rack, clean the attachment points with a bonding
brush at both the GTN rack and the aircraft, and re-attach the rack to the rails in the panel. Measure the
resistance between the mounting rack and nearby exposed portion of aircraft metallic structure and ensure
that the resistance is less than or equal to 2.5 mΩ.
4. Re-install the backplate assembly and re-install the GTN in the mounting rack.
4.5.2
GTN (Composite Aircraft)
NOTE
For GTN 7XX only: if the GMA 35 is installed, it must be removed from its rack and the
GMA 35 backplate assembly must be removed prior to performing step 3.
NOTE
A bonding test failure may occur if a fastener is not secured to the specified torque value.
For installations that use screws in lieu of rivets to secure the rack to surrounding
structure, verify that the screws are torqued to the appropriate value before proceeding to
remove the rack. Refer to Section 4.4 for torque values.
Perform an electrical bonding check as follows:
1. Remove the GTN 6XX or GTN 7XX from the mounting rack.
2. Remove the backplate assembly from the rack.
3. Measure the resistance between the mounting rack and the instrument panel, verify it is less than
or equal to 10 mΩ.
In the event of bonding test failure, remove the GTN rack, clean the attachment points with a bonding
brush at both the GTN rack and the aircraft, and re-attach the rack to the rails in the panel. Measure the
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resistance between the mounting rack and the instrument panel and ensure that the resistance is less than or
equal to 5 mΩ.
4. Re-install the backplate assembly and re-install the GTN in the mounting rack.
4.5.3
GMA 35 (Metallic or Tube-and-Fabric Aircraft)
NOTE
A bonding test failure may occur if a fastener is not secured to the specified torque value.
For installations that use screws in lieu of rivets to secure the rack to surrounding
structure, verify that the screws are torqued to the appropriate value before proceeding to
remove the rack. Refer to Section 4.4 for torque values.
NOTE
The GTN 7XX backplate assembly must be removed from the GTN rack prior to
performing step 4.
A bonding check is required for the GMA 35. Perform an electrical bonding check as follows:
1. Gain access to the GMA 35 by removing the GTN 7XX.
2. Remove the GMA unit from the mounting rack.
3. Remove backplate assembly from the rack.
4. Measure the resistance between the mounting rack and nearby exposed portion of aircraft metallic
structure and verify it is less than or equal to 10 mΩ.
In the event of bonding test failure, remove the GMA 35 rack and clean the attachment points with a
bonding brush at both the GMA rack and the aircraft attachment points. Measure the resistance between
the mounting rack and nearby exposed portion of aircraft metallic structure and ensure that the resistance is
less than or equal to 2.5 mΩ.
5. Re-install the backplate assembly and re-install the GMA unit in the mounting rack.
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4.5.4
GMA 35 (Composite Aircraft)
NOTE
A bonding test failure may occur if a fastener is not secured to the specified torque value.
For installations that use screws in lieu of rivets to secure the rack to surrounding
structure, verify that the screws are torqued to the appropriate value before proceeding to
remove the rack. Refer to Section 4.4 for torque values.
NOTE
The GTN 7XX backplate assembly must be removed from the GTN rack prior to
performing step 4.
1.
2.
3.
4.
Gain access to the GMA 35 by removing the GTN 7XX.
Remove the GMA unit from the mounting rack.
Remove the backplate assembly from the rack.
Measure the resistance between the mounting rack and the instrument panel and verify it is less
than or equal to 10 mΩ.
In the event of bonding test failure, remove the GMA 35 rack and clean the attachment points with a
bonding brush at both the GMA rack and the aircraft attachment points. Re-verify the resistance between
the mounting rack and the instrument panel and ensure that the resistance is less than or equal to 5 mΩ.
5. Re-install the backplate assembly and re-install the GMA unit in the mounting rack.
4.5.5 Flight Stream 210 (Metallic or Tube-and-Fabric Aircraft)
1. Disconnect the shield terminations from the Flight Stream connector backshell.
2. Measure the resistance between the connector and nearby exposed portion of aircraft metallic
structure and check that it is less than or equal to 20 mΩ.
In the event of bonding test failure, remove the Flight Stream connector bonding strap from the aircraft
ground plane and clean the attachment point with a bonding brush. Re-attach the bonding strap to the
aircraft ground plane; torque to 12-15 in-lbf. Measure the resistance between the Flight Stream connector
and aircraft structure, ensuring that the resistance is less than or equal to 10 mΩ. If cleaning the far side of
the strap is not enough, remove, clean, and re-attach on the Flight Stream 210 side.
3. Connect the shield terminations to the Flight Stream connector backshell.
4.5.6 Flight Stream 210 (Composite Aircraft)
1. Disconnect the shield terminations from the Flight Stream connector backshell.
2. Measure the resistance between the connector and instrument panel (or other aircraft ground) and
check that it is less than or equal to 20 mΩ.
In the event of bonding test failure, remove the Flight Stream connector bonding strap from the aircraft
ground plane and clean the attachment point with a bonding brush. Re-attach the bonding strap to the
aircraft ground plane; torque to 12-15 in-lbf. Measure the resistance between the Flight Stream connector
and aircraft ground, ensuring that the resistance is less than or equal to 10 mΩ. If cleaning the far side of
the strap is not enough, remove, clean, and re-attach on the Flight Stream 210 side.
3. Connect the shield terminations to the Flight Stream connector backshell.
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4.6 Transient Voltage Suppressor (TVS) (If Installed)
After a suspected lightning strike, each TVS and TVS assembly (if installed) must be replaced. Refer to
Section 6.9 for information on installing in-line TVSs.
4.6.1
GTN TVS1 Check (GTN #1 Only)
NOTE
The GTN should be the only LRU connected to the NAV/GPS circuit breaker. If other
equipment is connected to the NAV/GPS circuit breaker, it must be disconnected prior to
conducting the following check. No other TVS devices should be on this circuit. If the TVS
being checked is not isolated, erroneous readings may result.
For a dual GTN installation, only GTN #1 will have the TVS protection. The following checks will only
apply to GTN #1. Reference the appropriate GTN power interconnect drawings. To check the TVS on the
GTN power inputs, the following steps should be followed:
1. Remove the GTN as described in Section 6.1.
2. Open the GTN’s circuit breaker and use a multimeter to perform a diode check between P1001-19
and ground:
a. The meter should indicate open with the red lead on P1001-19 and the black lead on ground.
b. The meter should indicate a diode drop of between 2.0V and 2.5V with the red lead on ground
and the black lead on P1001-19.
i)
If the diode drop is outside of the above range, replace the TVS.
ii) If the meter indicates a short during steps 2a or 2b, replace the TVS.
iii) If the meter indicates an open in both directions, check the continuity of the fuse.
iv) If the fuse is open, replace the fuse and repeat the check.
v) If the fuse is good, check the wiring for faults. If the wiring is good, replace the TVS.
3. Verify continuity between P1001-19 and P1001-20.
4. Re-install the GTN as described in Section 6.1 and reset the GTN’s circuit breaker.
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4.6.2 GTN TVS2 Assembly Check (GTN #1 Only)
The TVS assembly (refer to Section 6.9) and fuse on the power bus side of GTN #1 must be inspected.
Verify operation of all four TVSs prior to replacing any failed TVS.
TO GTN #1
5A
CONTINUITY CHECK
1 2 3 4
TVS ASSEMBLY
CONNECTOR
1 2 3 4
STRIPE ON
TVS INDICATES
CATHODE SIDE
T T T T
V V V V
S S S S
TVS DIODE CHECK
Figure 4-1 TVS Assembly Check
Check the TVS assembly (TVS2) as follows:
1. Ensure that the power to the bus is off and disconnect the connector in the TVS assembly.
2. Use a multimeter to perform a diode check between the first connector contact (socket contact on
the first TVS) and ground. Refer to Figure 4-1 for additional details.
3. The meter should indicate open with the red lead on the connector socket contact and the black
lead on ground.
a. The meter should indicate a diode drop of between 2.0V and 2.5V with the red lead on ground
and the black lead on the connector socket contact.
i)
If the diode drop is outside of the above range, replace the TVS diode corresponding to the
contact being checked.
ii) If the meter indicates a short, replace the TVS diode corresponding to the contact being
checked.
iii) If the meter indicates an open, check the wiring for faults. If the wiring is good, replace the
TVS diode corresponding to the contact being checked.
4. Repeat checks in the previous step for each of the three remaining contacts/TVS diodes.
5. On the other connector, verify continuity between each of the four contacts and the power bus.
a. If there is no continuity between the power bus and all four contacts, check the continuity of
the fuse.
b. If there is continuity between the power bus and some contacts, but not others, check the
wiring to the open contacts and repair as necessary.
6. Reconnect the connector in the TVS assembly.
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4.7 GPS/SBAS Antenna Cable Overbraid Inspection (If Installed)
The GPS/SBAS antenna cable overbraid must be inspected after a known or suspected lightning strike.
Check the antenna and overbraid for the following:
1. Check the cable overbraid for pinching, melting, or evidence of arcing at the GPS/SBAS antenna
end and at the GTN 6XX/7XX.
2. Check the lug at the GTN end for evidence of arcing and verify that the lug is still secured to the
overbraid and to the GTN connector shield block.
3. Check that the overbraid is securely attached at the GPS/SBAS antenna end and at the
GTN6XX/7XX.
If any of these checks shows evidence of a lightning strike, replace the overbraid assembly in accordance
with Section 6.10.
4.8 WXR HSDB Cable Overbraid Inspection (If Installed)
The WXR HSDB cable overbraid must be inspected after a known or suspected lightning strike. Check the
overbraid for the following:
1. Check the cable overbraid for pinching, melting, or evidence of arcing at the WXR end and at the
bulkhead to which the WXR R/T is mounted.
2. Check the lug at the WXR end for evidence of arcing and verify that the lug is still secured to the
overbraid and to the WXR shield block.
3. Check that the overbraid is securely attached at the bulkhead end.
If any of these checks shows evidence of a lightning strike, replace the overbraid assembly in accordance
with Section 6.11.
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5 TROUBLESHOOTING
5.1 GTN General Troubleshooting ........................................................................................... 5-2
5.2 GTN Failure Annunciations................................................................................................ 5-6
5.3 GTN System Messages ....................................................................................................... 5-7
5.3.1 GTN System Related Alerts ......................................................................................... 5-7
5.4 Flight Stream Troubleshooting ......................................................................................... 5-24
5.5 GMA 35 Troubleshooting................................................................................................. 5-26
5.6 GMA 35 Failure Annunciations ....................................................................................... 5-27
5.7 GMA 35 System Messages............................................................................................... 5-27
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5.1 GTN General Troubleshooting
This section provides information to assist troubleshooting if problems occur after completing the
maintenance. Refer to the GTN System Configuration Log retained in the aircraft permanent records for a
list of the interfaced equipment and system configuration data. When troubleshooting the GTN or GMA
system, refer to the wire routing drawings and interconnect wiring diagrams that are retained in the aircraft
permanent records.
Table 5-1 GTN Troubleshooting Guide
Problem
The GTN does not
power on.
The GTN does not
compute a position.
Possible Cause
Corrective Action
The unit is not getting power to the
main connector P1001.
Ensure power is connected to the main
78-pin connector P1001, pins 19 and 20,
and ground to P1001, pins 77 and 78.
Check circuit breakers and main
avionics switch.
Not receiving adequate GPS
signals.
Check the GPS antenna connections.
Make sure the aircraft is clear of
hangars, buildings, trees, etc.
Wait 20 minutes for GTN to download
full GPS almanac and acquire position.
GPS signal levels
drop when avionics
are turned on.
Noise interference from other
avionics.
Turn all avionics off, then turn on each
piece one at a time to isolate the source
of the interference. Route GPS cable
and locate GPS antenna away from
sources of interference.
Improper antenna installation or
coaxial routing.
Check GPS antenna installation,
connections, and cable routing. The
GPS antenna must be mounted on the
top of the aircraft.
Antenna shaded from satellites.
Make sure the aircraft is clear of
hangars, buildings, trees, etc.
The GPS signal
levels are very low.
Add a 1575.42 MHz notch filter in COM
coaxial.
RF interference at 1575.42 MHz
from VHF COM.
Fix or replace the COM.
Disconnect the ELT antenna coaxial to
check for possible re-radiation.
Move GPS antenna further from the
COM antenna.
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Problem
Possible Cause
Corrective Action
The PTT input is not being pulled
low.
Check that the MIC 1 Transmit
(P1003-11) input is pulled low for
transmit. The state of this discrete input
can be monitored on the Discrete
Inputs page found on the GTN
Diagnostics page. Refer to
Section 3.3.5.
No transmit power to COM.
Make sure power input is connected to
the COM 44-pin connector P1003-30,
-43, and -44, and ground to P1003-37,
-38, and -40.
The input voltage is too low.
Increase input supply voltage to
>11VDC.
The COM sidetone
level is too low or too
high.
Wrong type of headsets or
sidetone level needs adjustment.
If necessary, adjust the sidetone level.
Sidetone adjustment is found on the
COM Setup Config Mode page.
OBS Resolver won’t
calibrate.
Incompatible resolver or improper
connection.
Check the resolver specifications and
wiring.
The GTN COM does
not transmit.
OBS indication on
GTN does not agree
with OBS setting.
GTN resolver input not calibrated
correctly.
Resolver has not been calibrated.
Terrain audio volume level set too
low.
GTN Terrain Audio
not heard.
GTN is not receiving
heading from
compass system
(ARINC 429 heading
input used).
Check wiring and calibration.
Check audio panel volume and
audio wiring.
Increase Terrain audio volume level.
Check wiring.
Main software version has just
been updated.
Allow up to 5 minutes for the Terrain
audio clips to load. Cycle power on the
GTN and verify that Terrain audio is
working properly.
ARINC 429 input port speed not
correct.
Check ARINC 429 input port speed
setting for port that the device is
connected to and verify that the speed is
correct for that device.
Wiring connections are incorrect.
The raw data being received by the GTN
can be monitored on the ARINC Inputs
page found on the GTN Diagnostics
page. Refer to Section 3.3.5.
Check wiring.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-3
Problem
Autopilot is not
getting GPSS/Roll
Steering data from
the GTN (ARINC 429
Roll Steering used).
Tuning data not
updating DME.
Possible Cause
Corrective Action
GTN does not have a position or
flight plan entered.
Acquire GPS position and enter a flight
plan.
GTN ARINC 429 output not
configured correctly.
Check ARINC 429 output port setting for
port to which the autopilot is connected.
ARINC 429 output port speed not
correct.
Check ARINC 429 output port speed
setting for port that autopilot is
connected to and verify that the speed is
correct for autopilot.
Wiring connections are incorrect.
Check wiring.
Certain autopilots require
groundspeed for GPSS to be
enabled.
Ensure that groundspeed is provided if
required by the autopilot. This can be
accomplished using GTN Demo mode.
Incorrect configuration.
Check the DME Channel Mode on the
VOR/LOC/GS CDI page.
Wiring connections are incorrect.
Check wiring.
Output not configured correctly.
ARINC 429 device is
not receiving data
from the GTN.
RS-232 device is not
communicating with
the GTN.
CDI scaling on EFS
40/50 is not correct.
190-01007-A1
Rev. 11
GTN ARINC 429 output not
configured correctly.
Check ARINC 429 output port setting for
port that device is connected to.
Receiving LRU ARINC 429 input
port speed not correct.
Check ARINC 429 input port speed
setting for the port that the device is
connected to and verify that the speed is
correct for that device.
Wiring connections are incorrect.
Check wiring.
GTN RS-232 port not configured
correctly.
Check RS-232 port setting for the port
that the device is connected to.
Improper setup on the remote
device.
Verify the configuration of the other
device.
Device not compatible or improper
connection.
Verify GTN RX is connected to remote
device TX and GTN TX is connected to
remote device RX.
Multiple TX lines connected
together.
Verify that there is only one TX source
per RX port.
Wiring connections are incorrect.
Check wiring.
Baud rate and parity settings not
set correctly.
Ensure the correct baud rate and parity
settings are selected in Configuration
mode.
On EFS 40/50, (prior to SG465
software version 1501) FMS #1/#2
configuration is not set to
KLN 90-GPS.
Reconfigure EFS 40/50 for KLN 90-GPS
on FMS #1/#2 inputs as appropriate.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-4
Problem
GTN boots into
Configuration mode
rather than Normal
mode.
190-01007-A1
Rev. 11
Possible Cause
Software Loader Card is inserted
into SD card slot.
Corrective Action
Remove Software Loader Card and
insert database card. Ensure GTN
powers up in Normal mode after this.
Reload software into the GTN. Refer to
Section 3.2. Ensure the GTN powers up
in Normal mode after this.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-5
5.2 GTN Failure Annunciations
If data fields become invalid, the GTN typically annunciates the failures with a large red “X”, as shown in
Figure 5-1.
Figure 5-1 Failure Screen
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-6
5.3 GTN System Messages
5.3.1
GTN System Related Alerts
Table 5-2 Alert Text Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
CROSSFILL
ERROR - Crossfill is
inoperative. See
CRG for crossfilled
items.
An error was detected during
unit-to-unit communication of
data. This can be caused by
problems with HSDB wiring or
by either GTN needing service.
Refer to the Cockpit Reference
Guide (CRG) for crossfilled
items.
Start both GTNs in Configuration mode
and ensure that both GTNs are configured
for crossfill.
DEMO MODE Demo mode is
active. Do not use for
navigation.
The GTN is in Demo mode and
must not be used for actual
navigation.
CDI/HSI FLAG Main lateral/vertical
flag on CDI/HSI is
inoperative.
The main lateral or vertical
superflag has been turned off
due to an overcurrent condition.
Check the GTN main lateral and vertical
superflag connections to the CDI/HSI for
correct wiring, shorts to ground, and
overcurrent. Superflags should not drive
more than 320 mA.
GTN - GTN needs
service.
The GTN has detected an
internal failure.
Contact Garmin Technical Support.
COOLING - GTN
overtemp. Reducing
backlight brightness.
The GTN has detected
excessive display backlight
temperature. The backlight has
been automatically dimmed to
reduce the unit temperature.
KEY STUCK HOME key is stuck.
The bezel’s Home key is stuck
in the enabled or pressed state.
KEY STUCK Direct-to key is
stuck.
The bezel’s Direct-To key is
stuck in the enabled or pressed
state.
KNOB STUCK - Dual
concentric inner
knob is stuck in the
pressed position.
The inner large knob push-key is
stuck in the enabled or pressed
state. Knob is located on the
right side of the unit.
KNOB STUCK Volume knob is stuck
in the pressed
position.
The small knob push-key is
stuck in the enabled or pressed
state. Knob is located on the left
side of the unit.
190-01007-A1
Rev. 11
Check J1002 connection on crossfilled
GTN units.
Ensure that P1002-10 of GTN #2 is
connected to ground.
Check that the DEMO MODE SELECT*
input (P1002-1) is not tied to ground.
Ensure that the Direct-To key is not
stuck.
Check for adequate ventilation or check
cooling airflow.
Ensure the cooling fan is operating and is
unobstructed.
Press the Home key again to cycle its
operation.
If the message persists, contact Garmin
technical support.
Press the Direct-To key again to cycle its
operation.
If the message persists, contact Garmin
technical support.
Press the knob to cycle its operation.
If the message persists, contact Garmin
technical support.
Press the knob to cycle its operation. If
the message persists, contact Garmin
technical support.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-7
Alert Text
Possible Cause
Corrective Action
CROSSFILL
ERROR - GTN
software mismatch.
See CRG for
crossfilled items.
The software does not match
between GTNs. Crossfill
disabled. Refer to the Cockpit
Reference Guide (CRG) for
crossfilled items.
Check the software version of both GTNs
and ensure they match. Update the
software if needed.
CROSSFILL
ERROR - GTN
Navigation DB
mismatch. See CRG
for crossfilled items.
GTN #1 and GTN #2 have
different cycles of the navigation
database.
If it is desired to utilize the crossfill
function, load the most current cycles of
the navigation database to each GTN.
CONFIGURATION
MODULE - GTN
configuration module
needs service.
The GTN configuration module
has failed.
Verify the configuration module wiring is
correct.
The GTN configuration module
is incorrectly wired.
Replace the configuration module.
DATABASE - Chart
function unavailable.
The GTN is configured for
ChartView or FliteCharts and
chart verification has failed.
Re-install charts onto data card. Verify
correct chart type is selected in the
configuration options. If problem persists,
contact Garmin technical support for
service.
DATABASE - Terrain
database is not
installed, is corrupt,
or is not valid for this
system
The terrain database is not
available, which could result
from the database not being
present at start-up or the
database being corrupt.
Re-install the terrain database onto the
card. If problem persists, contact Garmin
technical support for service.
DATACARD ERROR
- Data card is invalid
or failed.
The data card is not being
properly read by the GTN.
Load the terrain database and any Charts
databases to a new data card. Replace
the failed data card.
DATACARD
REMOVED Reinsert data card.
External data card was
removed.
Re-insert data card.
DATA LOST - Pilot
stored data was lost.
Recheck settings.
User settings, such as map
detail level, NAV range ring on/
off, traffic overlay on/off, and
alert settings, have been lost.
Re-check pilot-configurable settings.
FLIGHT PLAN
IMPORT - Flight plan
import failed.
The requested flight plan could
not be imported because the
GTN was unable to decode the
contents of the flight plan.
If importing flight plan from an SD card,
ensure flight plan is properly formatted per
Guideline for GTN Flight Plan and User
Waypoint Files. If the problem persists,
contact Garmin technical support for
service.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-8
Alert Text
Possible Cause
Corrective Action
Press the switch again to cycle its
operation.
REMOTE KEY
STUCK - Remote
OBS key is stuck.
The remote OBS switch is stuck
in the enabled or pressed state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that the
state of the input changes when the OBS
switch is pressed and released.
Verify that the remote OBS switch wiring
is correct.
Contact Garmin technical support.
REMOTE KEY
STUCK - Remote
CDI key is stuck.
The remote CDI key is stuck in
the enabled or pressed state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that the
state of the input changes when the CDI
switch is pressed and released.
Verify that the CDI switch wiring is correct.
Press the switch again to cycle its
operation.
Contact Garmin technical support.
Press the switch again to cycle its
operation.
REMOTE KEY
STUCK - Remote go
around key is stuck.
The remote Go Around switch
is stuck in the enabled or
pressed state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that the
state of the input changes when the Go
Around switch is pressed and released.
If the state still shows as active, inspect
the wiring to ensure that it is not loose or
shorting to ground.
• Check the wires between P1001-43,
-58, and -59 and the fan to ensure they
are not cut, damaged, or broken
COOLING FAN The cooling fan has
failed.
The wiring to the fan may be
faulty, the fan connector may be
unplugged, or the fan may have
failed.
• Check that the fan connector is
completely engaged
• Check that the fan blades are not
obstructed and they can rotate freely
• Check P1001 for ground lugs pushing
on fan
The fan does not turn on if the unit is cool.
GNS CROSSFILL GTN user
waypoint(s) replaced
with GNS user
waypoint(s).
190-01007-A1
Rev. 11
A user waypoint from the GNS
replaced one or more existing
waypoints on the GTN.
Ensure that the waypoints on the GNS
have unique names before transferring to
the GTN to avoid overwriting existing
waypoints.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-9
Alert Text
Possible Cause
Corrective Action
GNS CROSSFILL Catalog full; not all
GNS waypoint(s)
transferred.
A user waypoint from the GNS
could not be created because
the user waypoint catalog is full.
Remove some of the waypoints from the
catalog to make room for the waypoints
from the GNS.
GNS CROSSFILL Waypoint transfer
failed.
Waypoint transfer failed/
incomplete.
The data transfer should be reattempted.
INTERNAL SD
CARD ERROR GTN needs service.
The GTN’s internal data storage
has become corrupt or
nonfunctional.
Contact Garmin technical support.
INTERNAL SD
CARD REMOVED GTN needs service.
The GTN’s internal data storage
has been removed or has
become nonfunctional.
Contact Garmin technical support.
USER WAYPOINT
IMPORT - User
waypoint import
failed.
User Waypoint import failed due
to improper format.
Ensure the media has the correct file
format. Refer to Guideline for GTN Flight
Plan and User Waypoint Files. If the
problem persists, contact Garmin
technical support for service.
Waiting to receive
information from
unit...
The GTN is not communicating
with the remote LRU.
Ensure remote LRU is powered on. Check
wiring and configuration.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-10
5.3.1.1
COM Related Alerts
Table 5-3 COM Alert Troubleshooting Guide
Alert Text
COM RADIO - COM
radio needs service.
Possible Cause
A failure has been detected in the
COM transceiver. The transceiver
may still be usable.
Corrective Action
This message may appear after
operations in Configuration mode.
Cycle power to the entire GTN (both
GPS/NAV and COM circuit breakers)
and see if the message has cleared.
Contact Garmin technical support.
Verify that COM connector pins
P1003-43 and P1004-44 are
receiving aircraft power.
COM RADIO - COM
radio may be
inoperative.
The GTN is not able to communicate
with its COM transceiver.
Verify that COM connector pins
P1003-37 and P1003-38 are
connected to aircraft ground.
If the message persists, contact
Garmin technical support.
Press the PTT switch to cycle its
operation.
If the message persists, contact
Garmin technical support.
REMOTE KEY STUCK
- COM push-to-talk key
is stuck.
The COM push-to-talk switch is stuck
in the enabled or pressed state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that
the state of the input changes when
the PTT switch is pressed and
released.
Verify that the PTT switch wiring is
correct.
REMOTE KEY STUCK
- COM remote transfer
key is stuck.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that
the state of the input changes when
the COM remote frequency
increment switch is pressed and
released.
The COM remote transfer key is
stuck in the enabled or pressed state.
Verify that the COM remote
frequency increment switch wiring
is correct.
Press the COM remote transfer
switch to cycle its operation.
If the problem persists, contact
Garmin technical support.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-11
Alert Text
REMOTE KEY STUCK
- COM remote
frequency increment
key is stuck.
Possible Cause
The COM remote frequency
increment key is stuck in the enabled
or pressed state.
Corrective Action
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that
the state of the input changes when
the COM remote frequency
increment switch is pressed and
released.
Verify that the COM remote
frequency increment switch wiring
is correct.
Press the COM remote frequency
increment key to cycle its operation.
If the problem persists, contact
Garmin technical support.
Press the COM remote frequency
decrement key to cycle its operation.
REMOTE KEY STUCK
- COM remote
frequency decrement
key is stuck.
COM remote frequency decrement
key is stuck in the enabled or pressed
state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check that
the state of the input changes when
the COM remote frequency
decrement switch is pressed and
released.
Verify that the COM remote
frequency decrement switch wiring
is correct.
If the problem persists, contact
Garmin technical support.
COM RADIO - COM
overtemp or
undervoltage.
Reducing transmitter
power.
COM RADIO - COM
locked to 121.5 MHz.
Hold remote COM
transfer key to exit.
190-01007-A1
Rev. 11
Ensure the fan is functioning properly
and check for adequate airflow
around the unit.
The COM is reporting a high
temperature.
Ensure that the COM radio is
receiving adequate input voltage
(11-33 VDC).
The COM remote transfer switch has
been pressed for at least 2 seconds.
In Lockout mode, the COM will tune
the active frequency to 121.5 MHz
and not allow the frequency to be
changed. COM Lockout mode can be
exited by pressing the COM remote
transfer switch for at least 2
seconds.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-12
5.3.1.2
GPS/SBAS Related Alerts
Table 5-4 GPS/SBAS Alert Troubleshooting Guide
Alert Text
Possible Cause
GPS RECEIVER GPS receiver has
failed. Check GPS
coaxial for electrical
short.
A failure has been detected
in the GPS/SBAS receiver.
Verify that the center conductor is not
shorted to the braid in the coaxial cable.
GPS antenna cable may be
shorted to ground.
Contact Garmin technical support for
assistance.
GPS RECEIVER GPS receiver needs
service.
The GTN has detected an
internal failure in the GPS/
SBAS receiver.
Contact Garmin technical support.
Improper antenna
installation or coaxial
routing.
Check GPS antenna installation,
connections, and cable routing. The GPS
antenna must be mounted on top of the
aircraft.
Antenna shaded from
satellites.
Make sure the aircraft is clear of hangars,
buildings, trees, etc.
LOSS OF
INTEGRITY (LOI) Verify GPS position
with other
navigation
equipment.
Corrective Action
Move GPS antenna further from the COM
antenna.
RF interference at
1575.42 MHz from VHF
COM.
Add a 1575.42 MHz notch filter in COM
coaxial.
Fix or replace the COM.
Disconnect the ELT antenna coaxial to check
for possible re-radiation.
GPS NAVIGATION
LOST - Insufficient
satellites. Use other
navigation source.
There is no GPS fix
available or the system is in
Dead Reckoning mode.
Wait for GPS satellite geometry to improve.
Ensure the aircraft has a clear view of the
sky.
RAIM has determined that the info from one
or more GPS satellites may be in error.
GPS NAVIGATION
LOST - Erroneous
position. Use other
navigation source.
An internal position warning
has occurred.
GPS RECEIVER Low internal clock
battery.
The GTN has detected a
low battery. Almanac data
may have been lost.
Replace the battery.
MARK ON TARGET
- Waypoint creation
has failed. MOT
requires GPS
position.
Mark on target waypoint
creation has failed because
of missing GPS position.
Wait for GPS satellite geometry to improve.
Ensure the aircraft has a clear view of the
sky. Re-attempt waypoint creation.
SEARCHING SKY Search-the-sky in
progress.
The GTN is searching the
sky for GPS satellites.
Wait 20 minutes for the unit to complete the
cycle or until the current position is located.
190-01007-A1
Rev. 11
Ensure the aircraft has a clear view of the
sky.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-13
5.3.1.3
VLOC/GS Related Alerts
Table 5-5 VLOC/GS Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
VLOC RECEIVER Navigation receiver needs
service.
The GTN 650/750 has detected a
failure in its navigation receiver.
Contact Garmin technical
support.
VLOC RECEIVER Navigation receiver has
failed.
The GTN 650/750 has detected
an internal failure in its VLOC
receiver.
Contact Garmin technical
support.
GLIDESLOPE - Glideslope
receiver needs service.
The GTN 650/750 has detected
an internal failure in its glideslope
receiver.
Contact Garmin technical
support.
GLIDESLOPE - Glideslope
receiver has failed.
The GTN has detected an
internal failure in its glideslope
receiver.
Contact Garmin technical
support.
Press the NAV remote transfer
switch to cycle its operation.
REMOTE KEY STUCK NAV remote transfer key is
stuck.
NAV remote transfer key is
stuck in the enabled or pressed
state.
Go to the GTN DIAGNOSTICS DISCRETE INPUTS page in
Configuration mode and check
that the state of the input
changes when the NAV remote
transfer switch is pressed and
released.
Verify that the NAV remote
transfer switch wiring is correct.
If the problem persists, contact
Garmin technical support.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-14
5.3.1.4
Remote Transponder Related Alerts
Table 5-6 Remote Transponder Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
TRANSPONDER 1 OR 2
- ADS-B Out system fault.
Pressure altitude source
inoperative or connection
lost.
The transponder has lost
communication with the
pressure altitude source.
Verify wiring between the transponder
and the pressure altitude source. If
problem persists, contact Garmin
technical support for service.
TRANSPONDER 1 OR 2
- Transponder has failed.
The transponder has
detected an internal fault and
transponder functionality
may be unavailable.
Return unit to Garmin technical
support for service.
TRANSPONDER 1 OR 2
- Transponder is in
ground test mode.
The transponder is operating
in a mode intended for
ground testing.
Cycle the power to the transponder.
TRANSPONDER 1 OR 2
- Transponder overtemp.
The transponder is reporting
that its internal temperature
is above upper operating
limits.
Check for adequate ventilation around
the transponder.
TRANSPONDER 1 OR 2
- Transponder undertemp.
The transponder is reporting
that its internal temperature
is below lower operating
limits.
Contact Garmin technical support for
service if this message persists.
TRANSPONDER 1 Transponder 1 needs
service.
The transponder is reporting
a system failure.
Refer to the transponder installation
manual.
TRANSPONDER 2 Transponder 2 needs
service.
The transponder is reporting
a system failure.
Refer to the transponder installation
manual.
TRANSPONDER 1 Transponder 1 is
inoperative or connection
to GTN is lost.
The GTN cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
If two transponders are present,
ensure that both GTNs are powered
on.
Check for proper configuration of the
GTN and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
Ensure that both GTNs are powered
on.
TRANSPONDER 2 Transponder 2 is
inoperative or connection
to GTN is lost.
The GTN cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
Check for proper configuration of the
GTN and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-15
Alert Text
Possible Cause
TRANSPONDER Transponder 1 and 2
Mode S addresses do not
match.
The transponders are
configured for different
Mode S addresses.
TRANSPONDER 1 –
ADS-B is not transmitting
position.
The transponder has
insufficient data to support
ADS-B.
TRANSPONDER 2 ADS-B is not transmitting
position.
The transponder has
insufficient data to support
ADS-B.
190-01007-A1
Rev. 11
Corrective Action
Check the Mode S address for each
transponder and verify that they
match.
Ensure the aircraft has a clear view of
the sky.
Refer to the transponder installation
manual.
Ensure the aircraft has a clear view of
the sky.
Refer to the transponder installation
manual.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-16
5.3.1.5
GAD 42 Alerts
Table 5-7 GAD 42 Alert Troubleshooting Guide
Alert Text
Possible Cause
GAD 42 - GAD 42
configuration needs service.
GAD 42 - GAD 42 needs
service.
5.3.1.6
Corrective Action
GAD 42 not powered up.
Ensure that the GAD 42 is
receiving power and is
connected to ground.
GTN is not receiving data from
GAD 42.
Verify wiring between the GTN
and the GAD 42.
GAD 42 is reporting an internal
failure.
Contact Garmin technical
support.
Traffic Related Alerts
Table 5-8 Traffic Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
Ensure the traffic device is
receiving power and is
connected to ground.
TRAFFIC - Traffic device is
inoperative or connection to
GTN is lost.
Traffic device is not powered
up.
Traffic device has failed.
Verify the wiring between the
GTN and the traffic device.
Raw ARINC 429 data can be
viewed on the GTN
DIAGNOSTICS - ARINC
INPUTS page in Configuration
mode.
TRAFFIC - Traffic device
battery low. Traffic device user
config settings not saved.
The connected traffic system is
reporting that it has a low
battery.
Traffic system may require
service. Refer to external traffic
system maintenance manual
for additional details.
TRAFFIC - TAS/TCAS has
been in standby for more than
60 seconds.
The GTN is in the airborne
state and the traffic device has
been in standby for more than
60 seconds.
Troubleshoot the traffic
system. Refer to traffic system
installation manual.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-17
5.3.1.7
Datalink Related Alerts
Table 5-9 Datalink Alert Troubleshooting Guide
Alert Text
DATALINK - FIS-B weather
has failed.
Possible Cause
Corrective Action
The FIS-B receiver is reporting
that it has failed. The display of
FIS-B products may be
unavailable.
Check wiring to ADS-B In
source. Check for internal
faults in the ADS-B equipment.
If problem persists, contact
Garmin technical support for
service.
Check for proper configuration.
Ensure the GDL 69 is powered
up.
DATALINK – GDL 69 is
inoperative or connection to
GTN is lost.
The GTN cannot communicate
with the GDL 69.
Verify that the GDL 69
Ethernet ports are enabled.
HSDB data from the GDL 69
can be routed to the GTN
through other Garmin LRUs.
Ensure that all Garmin LRUs
are powered up.
Check for proper configuration.
Ensure the GDL 88 is powered
up.
DATALINK – GDL 88 is
inoperative or connection to
GTN is lost.
The GTN cannot communicate
with the GDL 88.
DATALINK - GDL 88 ADS-B
failure. Unable to transmit
ADS-B messages.
GDL 88 is not able to transmit
an ADS-B message due to a
failure with the GDL 88 system
or antenna(s).
DATALINK – GDL 88 ADS-B
fault.
The GDL 88 has detected a
fault with one of the GDL 88
UAT/1090 antennas.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – ADS-B fault: UAT
receiver.
The GDL 88 has detected a
UAT receiver fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – ADS-B fault:
1090 receiver.
The GDL 88 has detected a
1090 receiver fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 ADS-B is
not transmitting position.
Check GPS devices.
The GDL 88 has detected a
position input fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 control
panel input fault. Check
transponder is in correct mode.
The GDL 88 has lost
communication with the
transponder.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 ADS-B
fault. Pressure altitude input is
invalid.
The GDL 88 has lost
communication with the
pressure altitude source.
Refer to the GDL 88 STC
Installation Manual.
190-01007-A1
Rev. 11
HSDB data from the GDL 69
can be routed to the GTN
through other Garmin LRUs.
Ensure that all Garmin LRUs
are powered up.
Check the GDL 88 Fault page
in Configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-18
Alert Text
DATALINK - GDL 88 ADS-B
traffic has failed.
Possible Cause
GDL 88 may have lost GPS
position.
The GDL 88 has detected an
internal failure.
Corrective Action
Check the GDL 88 Fault page
in Configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 CSA
Failure
The GDL 88 is reporting to the
GTN that the CSA application
has failed. Traffic alerting on
ADS-B traffic is unavailable.
Ensure the aircraft has a clear
view of the sky.
DATALINK – GDL 88 external
traffic system inoperative or
connection lost.
The GDL 88 has detected a
TAS/TCAS input fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 external
traffic system has a low
battery.
The GDL 88 is reporting that
the external traffic system has
a low battery.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – GDL 88
configuration module needs
service.
The GDL 88 has detected a
configuration module fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – GDL 88 needs
service.
DATALINK - GSR 56 is
inoperative or connection to
GTN is lost.
DATALINK – GSR 56 data
services inoperative;
registration required.
190-01007-A1
Rev. 11
GDL 88 has detected an
internal fault.
The GTN is not able to
communicate with the GSR 56
Iridium transceiver.
If the problem persists, contact
Garmin technical support.
Check the GDL 88 Fault page
in Configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
Verify that the GTN is
configured correctly for the
GSR 56.
Check the RS-232 wiring
between the GTN and GSR 56.
Check that the GSR 56 is
receiving aircraft power and is
connected to aircraft ground.
Registration settings have
been altered or deleted.
In Normal mode, select
System>External LRUs.
Select the More Info button
next to the GSR 56 LRU.
Select Connext Registration
and re-enter the access code.
Account has been deactivated.
Reactivate account.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-19
5.3.1.8
Weather Radar Alerts
Table 5-10 Weather Radar Alert Troubleshooting Guide
Alert Text
Possible Cause
GTN ARINC 708 input port or
ARINC 429 output not
configured correctly.
Corrective Action
Check ARINC 708 port setting
for port 1. Raw ARINC 708
data can be viewed on the
GTN DIAGNOSTICS - ARINC
INPUTS page in Configuration
mode.
Verify that ARINC 429 Out 3 is
configured for Radar Format 1.
WX RADAR FAIL – Weather
radar is inoperative.
Improper setup on the weather
radar.
Verify the configuration of the
weather radar.
Wiring connections are
incorrect.
Check wiring.
Weather radar is reporting a
system fault.
WX RADAR SERVICE –
Weather radar needs service.
Return unit for repair.
190-01007-A1
Rev. 11
Weather radar is reporting a
system failure.
Check weather radar status
page on the GTN in
Configuration mode.
Refer to the weather radar
installation manual.
Refer to the weather radar
installation manual for
troubleshooting.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-20
5.3.1.9
TAWS Related Alerts
Table 5-11 TAWS Alert Troubleshooting Guide
Alert Text
DATABASE- Terrain or
Obstacle database not
available.
Possible Cause
Corrective Action
The terrain or obstacle
database is missing or corrupt.
Reload these databases on the
external data card.
Press the TAWS Inhibit key to
cycle its operation.
REMOTE KEY STUCK TAWS inhibit key is stuck.
The TAWS Inhibit input is
stuck in the enabled or pressed
state.
Go to the GTN DIAGNOSTICS
- DISCRETE INPUTS page in
Configuration mode and check
that the state of the input
changes when the TAWS
Inhibit switch is pressed and
released.
Verify wiring to the switch.
If the problem persists, contact
Garmin technical support.
Verify wiring to the TAWS
Audio Inhibit input.
TAWS AUDIO INHIBITED The TAWS Audio Inhibit
discrete has been active for at
least 30 seconds.
There is a wiring problem or a
problem with the remote LRU
that is connected to the GTN
audio inhibit input.
Go to the GTN DIAGNOSTICS
- DISCRETE INPUTS page in
Configuration mode and check
the state of the discrete input.
If the problem persists, contact
Garmin technical support.
CONFIGURATION – Terrain/
TAWS configuration is invalid.
GTN needs service.
The TAWS configuration is
invalid due to a loss or
corrupted registry.
The TAWS/terrain
configuration setting must be
reselected. Reselect the
TAWS or terrain selection and
cycle power to the GTN.
If the problem persists, contact
Garmin technical support.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-21
5.3.1.10 Third-Party Sensors Related Alerts
Table 5-12 Third-Party Sensor Alert Troubleshooting Guide
Alert Text
Possible Cause
Corrective Action
REMOTE KEY STUCK - Pilot/
Co-Pilot voice command pushto-command key is stuck.
The remote push-tocommand switch has been in
pressed position for at least 30
seconds. This input will now be
ignored.
Press the PTC switch to cycle
its operation. Verify wiring to
the PTC switch. Check for a
faulty PTC switch. If the
problem persists, contact
Garmin technical support.
Stormscope is not powered up.
Ensure Stormscope is
receiving power and is
connected to ground.
Wiring corrections are
incorrect.
Check wiring.
Stormscope is reporting a
system failure.
Refer to Stormscope
installation manual for
troubleshooting.
The Stormscope is receiving
invalid heading.
Refer to Stormscope
installation manual for
troubleshooting.
STORMSCOPE - Stormscope
is inoperative or connection to
GTN is lost.
STORMSCOPE - Invalid
heading received from
Stormscope.
If the GTN is not expected to
receive pressure altitude,
ensure that ALTITUDE
SOURCE INPUT is configured
for “Not Connected.”
DATA SOURCE - Pressure
altitude source inoperative or
connection to GTN lost.
The GTN is configured to
receive pressure altitude, but is
not receiving it from any
source.
Check RS-232 port setting for
the port that the device is
connected to.
Verify the configuration of the
other device.
Verify the GTN RX channel is
connected to the remote
device TX channel.
Verify there is only one TX
source per RX port.
Check wiring.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-22
Alert Text
Possible Cause
Corrective Action
If the GTN is not expected to
receive heading, ensure that
Heading Source Input and
Synchro Heading Input
(GTN 7XX only) are configured
for “Not Connected.”
DATA SOURCE - Heading
source inoperative or connection
to GTN lost.
The GTN is configured to
receive heading, but is not
receiving it from any source.
Check ARINC 429 or RS-232
port setting for the port
connected to the heading
source.
Verify the configuration of the
heading source.
Check the RS-232,
ARINC 429, or Synchro
(GTN 7XX only) wiring
between the GTN and the
heading source.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-23
5.4 Flight Stream Troubleshooting
Table 5-13 Flight Stream Troubleshooting
Problem
Possible Cause
Corrective Action
Trying to pair with the device while
not on the Bluetooth Pairing page.
Access the Connext Bluetooth Pairing
page by pressing the Home key >
System key > Connext Setup > Flight
Stream 210. If Flight Stream 210 is the
only Bluetooth device, touching Connext
Setup will automatically open the Flight
Stream 210 page.
Flight Stream paired device storage
is full.
Refer to the list of paired devices and
verify that the queue is not full. If 13
devices have been previously paired with
the Flight Stream, remove a device from
the list to pair the new device with the
Flight Stream.
Ensure that the Flight Stream has
the latest certified software version.
Check software version and update if
there is a newer approved version.
Unable to pair PED
to Flight Stream
210/510.
Flight Stream 210
is connected but
Connext Setup
page is grayed out.
PED is not
receiving any data
from Flight Stream
210/510.
Check that the Flight Stream 210
connector is fully seated.
Flight Stream 210 has lost
communication with the GTN.
Check RS-232 wires and connections
between the GTN and Flight Stream 210.
Check power and ground wires and
connections to the Flight Stream 210.
1. Access the Connext Bluetooth
Pairing page by pressing the Home
key > System key > Connext Setup.
Devices need to be re-synced with
each other.
2. Remove the PED from the list of paired
devices on the GTN.
3. Remove the list of Bluetooth devices
on the PED.
4. Re-pair the devices.
Check that PED is paired to Flight Stream
210. Refer to the steps above for details.
PED is not
receiving data from
the GDL 88
(e.g., ADS-B traffic
and FIS-B).
Check that the Flight Stream 210
connector is fully seated.
Flight Stream 210 has lost
communication with the GDL 88.
Check RS-422 wires and connections
between the GDL 88 and Flight Stream
210.
Check power and ground wires and
connections to the Flight Stream 210.
Check that the GDL 88 RS-422 port is
configured for Connext Format 1.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-24
Problem
Possible Cause
PED is not
receiving data from
the GDL 69 (e.g.,
datalink weather).
Check that PED is paired to Flight Stream
210. Refer to the previous steps for
details.
Flight Stream 210 has lost
communication with the GDL 69.
PED will not control
GDL 69 Sirius XM
audio.
190-01007-A1
Rev. 11
Corrective Action
Check that the Flight Stream 210
connector is fully seated.
Check RS-232 wires and connections
between the GDL 69 and Flight Stream
210.
Check power and ground wires and
connections to the Flight Stream 210.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-25
5.5 GMA 35 Troubleshooting
This section provides information to assist troubleshooting if problems occur after completing
maintenance. Refer to the system configuration log retained in the aircraft permanent records for a list of
interfaced equipment and system configuration data.
Table 5-14 GMA 35 Troubleshooting
Problem
Audio volume, audio routing,
music, marker beacon status,
or intercom are not working
properly.
Possible Cause
GMA 35 is not configured properly.
GMA 35 is disconnected from aircraft
power or ground.
Corrective Action
Check the configuration
against the configuration log
to ensure that the GMA 35 is
configured properly.
Ensure power is connected to
P3502, pins 8 and 9, and
ground is connected to P3502,
pins 10 and 11.
Check circuit breakers and
avionics switch.
Audio panel operates only in
Failsafe mode (pilot headset
connected to one COM radio,
red “X” over the audio panel
control field).
Verify that the GMA 35 is fully
seated.
GMA 35 is not seated correctly.
RS-232 communication between the
GTN 7XX and the GMA 35 is not
functioning correctly.
190-01007-A1
Rev. 11
Check for proper configuration
of the GTN and GMA 35
RS-232 ports.
Check for correct wiring
between the audio panel and
the GTN 7XX.
SMA cable loose at antenna or on
back of GMA 35c.
Ensure cable is tight at
antenna and back of
GMA 35c.
Bluetooth disabled.
Enable Bluetooth under
Connext Setup > GMA 35c.
Trying to pair with the device while
not on the GMA 35c Pairing page.
Access the GMA 35c Pairing
page by touching the Home
key > System key > Connext
Setup > GMA 35c. If GMA
35c is the only Bluetooth
device, touching Connext
Setup will automatically open
GMA 35c page.
Bluetooth isn’t working.
Unable to pair PED to
GMA 35c.
Verify that counter-sunk
flathead screws are used to
secure the GMA 35
connectors to the backplate.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-26
5.6 GMA 35 Failure Annunciations
Figure 5-2 depicts a typical failure indication of the GMA 35 audio panel.
Figure 5-2 GMA 35 Failure Annunciation
5.7 GMA 35 System Messages
Table 5-15 Remote Audio Panel Alert Troubleshooting Guide
Alert Text
AUDIO PANEL - Audio panel
needs service.
AUDIO PANEL - Audio panel is
inoperative or connection to
GTN is lost.
Possible Cause
Audio panel should be
serviced.
Return audio panel to Garmin
for service.
Audio panel is not powered up.
Ensure the audio panel is
receiving power and connected
to ground.
Audio panel has failed.
Wiring connections are
incorrect.
190-01007-A1
Rev. 11
Corrective Action
Verify the wiring from the audio
panel to the GTN.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 5-27
6 EQUIPMENT REMOVAL AND RE-INSTALLATION
6.1 GTN.................................................................................................................................... 6-2
6.1.1
Display of Self-Test Data .......................................................................................... 6-5
6.2 GMA 35.............................................................................................................................. 6-6
6.3 Data Card/Flight Stream 510.............................................................................................. 6-9
6.4 Flight Stream 210 ............................................................................................................. 6-10
6.5 NAV Antenna Cable Diplexer ......................................................................................... 6-11
6.6 NAV Antenna Cable Splitter............................................................................................ 6-11
6.7 Configuration Module (P1001 Only) ............................................................................... 6-12
6.8 GTN Fan........................................................................................................................... 6-15
6.9 TVS and Fuse (Nonmetallic Aircraft Only)..................................................................... 6-18
6.9.1
Fuse .......................................................................................................................... 6-18
6.9.2
TVS .......................................................................................................................... 6-18
6.10 GPS/SBAS Antenna Cable Overbraid ............................................................................. 6-22
6.11 WXR HSDB Cable Overbraid ......................................................................................... 6-24
6.12 Instrument Panel Bonding Strap ...................................................................................... 6-26
6.13 Flight Stream 210 Bonding Strap..................................................................................... 6-27
This section describes how to remove and replace equipment associated with this STC. After removal and
re-installation, LRUs must be configured and tested as described in Section 7.
CAUTION
When removing and/or replacing a GTN, GMA 35, or any other item under the scope of
the STC installation, always ensure that the aircraft power is off. Unplug any auxiliary
power supply.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-1
6.1 GTN
Removal
1. Locate and open the GTN GPS/NAV and COM (GTN 635/650/750 only) circuit breakers.
2. Locate the unit retention mechanism access hole at the bottom-left corner of the unit face.
3. Insert a 3/32" hex tool into the access hole and turn the fastener counterclockwise until the unit is
forced out about 3/8 inches and can be freely pulled from the rack.
4. Slide the GTN unit out of the rack.
Re-installation
NOTE
It may be necessary to insert the hex drive tool into the access hole and turn the cam
mechanism 90° counterclockwise to ensure correct position prior to placing the unit in the
rack.
CAUTION
Be sure not to overtighten the unit into the rack. The application of hex drive tool torque
exceeding 15 in-lbf can damage the locking mechanism.
CAUTION
The Bluetooth antenna port on the GMA 35c has a tight clearance between the GMA and
GTN. Ensure the GMA and antenna cable are fully seated before inserting the GTN. The
face of the GMA 35c should be flush with the mounting rack when fully seated.
1. Ensure that the GTN GPS/NAV and COM circuit breakers are open.
2. Slide the GTN straight into the rack until it stops about 1 inch short of the fully seated position.
3. Insert a 3/32" hex drive into the unit retention mechanism access hole at the bottom of the unit face
and turn the tool clockwise while pressing the bezel until the unit is firmly seated in the rack.
4. Once the GTN is re-installed, verify that the unit power-up self-test sequence is successfully
completed and no failure messages or configuration error messages are annunciated. Section 6.1.1
outlines the power-up self-test sequence.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-2
211-60234-08
SCREW, 4-40 x .25 (4X)
1
330-00053-01
BNC CONNECTOR
1
330-00053-02
BNC/TNC CONNECTOR
2
1
212-00022-00
SHOULDER WASHER
115-01294-00
GTN 7XX MOUNTING RACK
1
1
330-00053-01
BNC CONNECTOR
1
1
253-00421-00
CHASSIS GASKET
125-00221-10
GTN 7XX BACKPLATE
1
1
4
371-00014-01
FAN
211-60234-23
SCREW, 4-40 x 1.375 (4X)
2
011-02326-0X
CONNECTOR KIT
1
PART OF P/N 011-02246-00 (GTN 725, BLACK) AND P/N 011-02246-02 (GTN 750, BLACK AND GRAY) KITS. REFER
TO THE TABLE FOR KIT CONTENT DIFFERENCES.
2
REFERENCE P/N 010-00819-50 (GTN 725, BLACK), P/N 010-00820-50 (GTN 750, BLACK), AND P/N 010-00890-50
(GTN 750, GRAY) KITS.
3
REFER TO TABLE FOR KIT REFERENCE INFORMATION.
4
TORQUE 4.5-5.2 IN-LBF.
BACKPLATE KIT
CONTENT DIFFERENCES
GTN 725
010-00819-50
CONNECTOR
KIT 2
011-02326-00
GTN 750 (BLACK)
010-00820-50
011-02326-02
011-02246-02
GTN 750 (GRAY)
010-00890-50
011-02326-02
011-02246-02
UNIT DESCRIPTION
INSTALLATION
KIT
BACKPLATE
KIT
2
011-02246-00
WASHER
QTY
(EACH)
212-00022-00
3
BNC
CONNECTOR
QTY
(EACH)
330-00053-02
2
1
3
0
2
Figure 6-1 GTN 7XX Mounting Rack Assembly
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-3
211-60234-08
SCREW, 4-40 x .25 (4X)
1
330-00053-02
BNC/TNC CONNECTOR
330-00053-01
BNC CONNECTOR
1
1
212-00022-00
SHOULDER WASHER
2
1
115-01293-00
GTN 6XX MOUNTING RACK
211-60234-23
SCREW, 4-40 x 1.375 (4X)
1
4
253-00421-00
1 CHASSIS GASKET
330-00053-01
1 BNC CONNECTOR
125-00220-10
1 GTN 6XX BACKPLATE
1
371-00014-01
FAN
2
011-02325-0X
CONNECTOR KIT
1
PART OF P/N 011-02245-00 (GTN 625, BLACK), P/N 011-02245-01 (GTN 635, BLACK), AND P/N 011-02245-02
(GTN 650, BLACK AND GRAY) KITS. REFER TO TABLE FOR KIT CONTENT DIFFERENCES.
2
REFERENCE P/N 010-00811-50 (GTN 625, BLACK), P/N 010-00812-50 (GTN 635, BLACK), P/N 010-00813-50
(GTN 650, BLACK), AND P/N 010-00889-50 (GTN 650, GRAY) KITS.
3
REFER TO TABLE FOR KIT REFERENCE INFORMATION.
4
TORQUE 4.5-5.2 IN-LBF.
BACKPLATE KIT
CONTENT DIFFERENCES
GTN 625
010-00811-50
CONNECTOR
KIT 2
011-02325-00
GTN 635
010-00812-50
011-02325-01
011-02245-01
GTN 650 (BLACK)
010-00813-50
011-02325-02
011-02245-02
GTN 650 (GRAY)
010-00889-50
011-02325-02
011-02245-02
UNIT DESCRIPTION
INSTALLATION
KIT
BACKPLATE
KIT
2
011-02245-00
WASHER
212-00022-00
QTY
(EACH)
BNC
CONNECTOR
QTY
(EACH)
1
0
2
1
3
3
330-00053-01
2
2
Figure 6-2 GTN 6XX Mounting Rack Assembly
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-4
6.1.1 Display of Self-Test Data
Following normal power-up, the database pages are displayed, followed by the Instrument Panel
Self-Test page. Touch Continue to display the Instrument Panel Self-Test page. During this time, the
electrical outputs are activated and set to the values listed below. Touch Continue to acknowledge the
Instrument Panel Self-Test page. This is not a required check, although this page can be useful for
troubleshooting installation problems.
Table 6-1 Self-Test Values
Parameter
Self-Test Value
Course Deviation
Half-scale left deviation, TO indication, flag pulled
Glideslope/Vert. Deviation
Half-scale up deviation, flag pulled
Annunciators
All On
Selected Course (OBS)
The GTN displays the OBS value (149.5° if interfaced to an HSI with
driven course pointer).
Desired Track
149.5° (Displayed as 150°)
Items below are not displayed on the Instrument Panel Self-Test page
Distance to Go
10.0 nautical miles
Time to Go
4 minutes
Bearing to Waypoint (RMI)
135°
Active Waypoint
“GARMN”
Groundspeed
150 knots
Present Position
N 39°04.05’, W 94°53.86’
Waypoint Alert
Active
Phase of Flight
En Route
Message Alert
Active
Leg/OBS Mode
Leg Mode
GPS Integrity
Invalid
Roll Steering (if applicable)
Flight Director commands 0° bank (level flight) for 5 seconds;
commands increasing right bank at 1°/second for 5 seconds;
commands 5° right bank for 5 seconds; commands decreasing right
bank at 1°/second for 5 seconds, until command is 0° bank again.
This cycle repeats continuously.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-5
6.2 GMA 35
Removal
1. Locate and open the audio panel circuit breaker.
2. Ensure that the GTN(s) are not receiving power prior to removal of the audio panel.
3. Remove the GTN 7XX.
4. GMA 35c only: Remove the Bluetooth antenna cable.
5. Locate the GMA 35 unit retention mechanism access hole at the bottom-center of the unit face.
6. Insert a 3/32" hex tool into the access hole and turn the fastener counterclockwise until the unit is
forced out about 3/8 inches and can be freely pulled from the rack.
7. Slide the GMA 35 unit out of the rack.
Re-installation
NOTE
Be sure not to overtighten the unit into the rack. The application of hex drive tool torque
exceeding 15 in-lbf can damage the locking mechanism.
1. Ensure that the audio panel circuit breaker is open and the GTN units are not receiving power.
2. Slide the GMA 35 straight into the rack until it stops.
3. Insert a 3/32" hex drive into the unit retention mechanism access hole at the bottom of the unit face
and turn the tool clockwise while pressing on the face of the unit until the GMA 35 is firmly seated
in the rack.
4. GMA 35c only: Re-install the Bluetooth antenna cable. Torque to 8-10 in-lbf using a 5/16 SMA
torque wrench.
5. Ensure the face of the GMA is flush with the edge of the GMA installation rack when seated.
6. Re-install the GTN 7XX.
7. Verify that there are no failure messages or annunciations when the GTN and audio panel is
powered on.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-6
211-60234-08
SCREW, 4-40 X .250
1
5
115-01464-00
GMA 35 MOUNTING RACK
5
2
3
211-63234-11
SCREW, 4-40 X .437
125-00040-00
1
GMA 35 BACKPLATE
2
011-00950-02 BACKSHELL (2X)
011-01169-00 GROUND ADAPTER (4X)
330-00185-44 CONNECTOR (2X)
336-00021-00 PINS (A/R)
1
PART OF 011-02300-00 BACKPLATE KIT.
2
PART OF 011-02302-00 CONNECTOR KIT.
3
PART OF 010-00831-01 INSTALLATION KIT.
4
REFER TO TABLE FOR KIT REFERENCE INFORMATION.
5
TORQUE 4.5 – 5.2 IN-LBS.
Unit DESCRIPTION
INSTALLATION KIT
CONNECTOR KIT
GMA 35
010-00831-01
011-02302-00
011-02300-00
GMA 35
010-00831-21
011-02302-00
011-02300-00
GMA 35c
010-00831-41
011-02302-00
011-02300-00
3
BACKPLATE KIT
4
Figure 6-3 GMA 35 Mounting Rack Assembly Overview
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-7
325-00458-()
700-00076-00
BLUETOOTH ANTENNA/CABLE KIT
011-03909-00
GMA35c ONLY
211-60234-08 GMA35 BACK PLATE KIT
4 PLACES
011-02300-00
125-00040-00
011-02299-()
115-01464-00
211-63234-11
4 PLACES
330-00185-44
GMA 35 CONNECTOR KIT 2 PLACES
011-02302-00
011-00950-02
2 PLACE
011-01169-00
Figure 6-4 GMA 35c Mounting Rack Assembly Overview
190-01007-A1
Rev.11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-8
6.3 Data Card/Flight Stream 510
CAUTION
Handle the data cards carefully. Do not touch the connector edge of the data card.
NOTE
A data card or Flight Stream 510 containing databases is required for full system
functionality. One of the two must be installed.
Removal
1. Ensure that the GTN is turned off.
2. Remove the data card/Flight Stream 510 by pressing the card until it disengages and then pull the
card to extract from the unit.
Re-installation
1. With the label facing right, insert the new data card/Flight Stream 510 into the data card slot on the
front-left of the GTN by pushing the card straight into the slot.
2. Press until it is fully inserted and locked into position.
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6.4 Flight Stream 210
Refer to Figure 6-5 when performing the following steps:
Removal
1. Locate and open the BT Link circuit breaker.
2. Unscrew the two jackscrews on the Flight Stream connector. Remove connector.
3. Locate the four #6 mounting screws for the unit and unscrew them; remove the Flight Stream
device.
Re-installation
1. Ensure that the BT Link circuit breaker is open.
NOTE
Ensure that the Flight Stream is mounted with the arrow pointing in the direction of flight.
2. Re-install the Flight Stream device using the four previously removed #6 mounting screws.
Tighten fasteners until snug and turn an additional one-quarter turn.
3. Attach the connector, tightening the two jackscrews.
4. Close the BT Link circuit breaker.
HT
IG
ON
OF
FL
TI
C
RE
DI
FLIGHT STREAM 210: P/N 011-03257-40
CONNECTOR KIT ASSEMBLY: P/N 011-03258-00
Figure 6-5 Flight Stream Assembly Overview
(Bonding Strap Not Shown)
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6.5 NAV Antenna Cable Diplexer
Removal
1. Disconnect the coaxial connectors from diplexer, taking note of which coaxial connectors are
connected to each port on the diplexer.
2. Remove the mounting screws and diplexer.
Re-installation
1. Re-install the diplexer over the existing hole pattern and re-install fasteners. Torque fasteners
within 22-25 in-lbf.
2. Diplexer fasteners are standard steel fasteners with 0.1900-32UNF-2A thread. Refer to aircraft
parts catalog or standard practices manual for recommendations.
3. Reconnect the coaxial connectors to the diplexer.
6.6 NAV Antenna Cable Splitter
Removal
1. Disconnect the coaxial connectors from the splitter, taking note of which coaxial connectors are
connected to each port on the splitter.
2. Remove the mounting screws and splitter.
Re-installation
1. Re-install the splitter over the existing hole pattern and re-install fasteners. Torque fasteners within
5-6 in-lbf. Splitter fasteners are standard steel fasteners with 0.1380-40UNF-2A thread. Refer to
aircraft parts catalog or standard practices manual for recommendations.
2. Reconnect the coaxial connectors to the splitter.
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6.7 Configuration Module (P1001 Only)
GTN P1001 connector assemblies serve as the housing for a configuration module. This section lists
configuration module assemblies.
Table 6-2 Configuration Module Wire Color Reference Chart
Color
Function
P1001 Contact
Red
Vcc
65
Black
Ground
64
Yellow
Data
62
White
Clock
63
NOTE
The pin contacts supplied with the GTN configuration module are specifically made to
accommodate 28 AWG wire. The crimp tool should have the indenter set to the correct
setting when crimping these contacts to the configuration module harness.
Configuration modules are located within the GTN harness connector backshell (item 6, Figure 6-6). There
are two configuration module kits that have been approved for use with the GTNs. The P/N 011-00979-00
configuration module kit has a spacer (Figure 6-7). The P/N 011-00979-03 configuration module kit does
not use a spacer (Figure 6-6). The P/N 011-00979-03 configuration module kit is recommended for all
replacements. The instructions for removal/replacement of a configuration module apply equally to either
part number. Unless otherwise noted, refer to the corresponding backshell assembly drawing when
performing the following removal and re-installation steps.
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Table 6-3 Configuration Module Kit P/N 011-00979-03 (P1001)
Figure 6-6
Reference
Description
Garmin P/N
1
Configuration Module, PCB Board Assembly w/EEPROM
011-02178-00
3
4-Conductor Harness
325-00122-00
4
Pin Contact, Crimp, #22D
336-00021-00
Figure 6-6 Backshell Assembly (Potted Configuration Module)
Removal
1. Disconnect the connector (5) from the GTN backplate assembly.
2. Remove two screws (8) from cover (7) and remove cover. Refer to Figure 6-6 for this step.
3. Unplug the connector from the configuration module (1).
4. Remove the configuration module from the backshell (6).
Re-installation
1. Inspect the connector for damaged pins (4) or wires (3).
2. Place the configuration module (1) in position.
3. Insert connector into the configuration module (1).
4. Place the cover (7) back on the connector and re-install screws (8). Refer to Figure 6-6 for this
step.
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Page 6-13
Table 6-4 Configuration Module Kit P/N 011-00979-00 (P1001)
Figure 6-7
Reference
Description
Garmin P/N
1
Configuration Module, PCB Board Assembly w/EEPROM
012-00605-00
2
Spacer, Configuration Module
213-00043-00
3
4-Conductor Harness
325-00122-00
4
Pin Contact, Crimp, #22D
336-00021-00
5
x2
6
1
2
3
4
7
Figure 6-7 Backshell Assembly (Configuration Module with Spacer)
Removal
1. Disconnect the connector from the GTN backplate assembly.
2. Remove two screws (5) from cover (6) and remove cover.
3. Unplug the connector from the configuration module (1).
4. Remove the configuration module from the backshell (7).
Re-installation
1. Inspect the connector for damaged pins (4) or wires (3).
2. Apply spacer (2) by wrapping it around the PCB board (1) making sure to insert the plastic
connector mounted on the board into the hole provided in the spacer.
3. Place the configuration module (1) in position.
4. Insert connector into the configuration module (1).
5. Place the cover (6) back on the connector and re-install screws (5).
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6.8 GTN Fan
CAUTION
To avoid damage to the GTN, take precautions to prevent Electro-Static Discharge (ESD)
when handling the GTN, connectors, fan, and associated wiring. ESD damage can be
prevented by touching an object that is of the same electrical potential as the GTN before
handling the GTN itself.
The GTN cooling fan assembly is located behind the unit rack. Fan removal and replacement details for
specific installations fall outside the scope of this manual.
Removal
1. Remove power from aircraft.
2. Remove the GTN unit from the rack. Refer to Section 6.1.
3. Loosen the four 4-40 x 0.25" panhead screws at each corner of the inside rear wall of the rack.
4. While depressing the metal spring at the lower-left corner of the rack’s rear face, slide the
connector backplate to the left. The connector backplate is now free of the rack.
5. Disconnect the fan power connector. Be careful to avoid damaging the fan wires.
6. Remove the four 4-40 x 1.375" panhead screws attaching the fan to the backplate.
Re-installation
1. Position the fan on the backplate with the fan connector pigtail oriented along the left edge of the
backplate, as shown in Figure 6-8.
2. Re-install screws.
3. Connect fan power connector.
Figure 6-8 Fan/Backplate Orientation (GTN 7XX)
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Table 6-5 lists part numbers for the fan kit that are used with P1001 only.
Table 6-5 Fan Kit
Figure 6-9 Ref
Description
Garmin P/N
1
Fan Cable Assembly, 3-Conductor Harness
320-00600-00
2
Pin Contact, Crimp, #22D
336-00021-00
3
Silicone Fusion Tape
249-00114-00
Table 6-6 Fan Cable Wire Color Reference Chart
Color
Function
P1001 Contact
Red
Power
59
Black
Ground
43
Yellow
Fan tach
58
Fan Wiring Harness Replacement
1. Strip 0.17 inches of insulation from each wire prior to crimping. Crimp socket contacts onto each
wire of the 3-conductor wire harness. Insert newly crimped socket contacts and wires into the
appropriate connector housing location, as shown in Figure 6-9.
2. Plug the 3-conductor wire harness connector into the connector on the fan.
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Page 6-16
Figure 6-9 Fan Wiring Replacement
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page 6-17
6.9 TVS and Fuse (Nonmetallic Aircraft Only)
This section applies to IFR nonmetallic aircraft only. VFR nonmetallic aircraft do not require the use of
TVSs or fuses.
Certain nonmetallic aircraft will require TVSs at the main power input of the GTN.
The following materials are used to construct TVS1 and TVS2:
Transient Voltage Suppression Materials
 Transient voltage suppressor 30KPA48A (TVS1 and/or TVS2)
 Transient voltage suppressor 15KPA48A (TVS1 only)
 Fuse, 3AG, fast-acting, 4A Littelfuse, P/N 0312004 (TVS1 assembly)
 Fuse, 10A Littelfuse, P/N 0312010 (TVS2 assembly)
 Fuse holder, inline, Cooper Bussman, P/N HFB (TVS1 and TVS2)
 Connector, 4-pin plug (socket housing) and cap (pin housing) (TVS2)
 Tyco electronics P/Ns 1-480424-0 and 1-480426-0 (TVS2)
 Sockets, qty. 4, Tyco Electronics, P/N 60617-1 or 60619-1 (TVS2)
 Pins, qty. 4, Tyco Electronics, P/N 60618-1 or 60620-1 (TVS2)
 Electrical tie-down strap, MS3367-1-X
6.9.1 Fuse
Removal
1. Open the fuse holder and remove the fuse.
Re-installation or Replacement
1. If the fuse continuity checks good, re-install fuse and close the fuse holder. If the fuse is open,
replace the fuse and close the fuse holder.
The fuse for TVS1 is a 3AG fast-acting, 4A Littelfuse (P/N 0312004). The fuse for TVS2 is a 10A
Littelfuse (P/N 0312010).
6.9.2 TVS
The 15KPA48A or the 30KPA48A can be used for TVS1, but only the 30KPA48A can be used for TVS2.
TVS1 Removal
1. Remove the shield block grounding screw and remove the ring terminal from the backshell of the
connector, as shown in Figure 6-10.
2. Open the fuse holder and remove the fuse.
3. Carefully remove heat shrink from the TVS ensuring not to cut the insulation on the wire under the
heat shrink.
4. On the fuse end of the TVS, use a soldering iron to heat the solder joint to remove the TVS.
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TVS1 Replacement
CAUTION
Be aware of the orientation of the TVS during replacement. Refer to Figure 6-10 for
proper alignment of the TVS.
1. Solder new TVS onto the exposed wire from the fuse holder.
2. Solder a small piece of wire to the opposite end of the TVS. The total wire length to the
environmental splice is not to exceed 6 inches.
3. Install heat shrink over the exposed TVS and solder joints.
4. Attach the ring terminal to the new lead, as shown in Figure 6-10.
5. Place the fuse back into the fuse holder and close the holder.
6. Re-attach the ring terminal to the backshell of the connector.
Figure 6-10 TVS/Fuse Replacement (TVS1/F1)
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TVS2 Removal
1. Remove the ring terminal from ground, as shown in Figure 6-12.
2. Carefully remove heat shrink from the TVS assembly, ensuring not to cut the insulation on the
wire under the heat shrink.
3. If replacing the entire TVS assembly, unplug the 4-pin connector and proceed to step 1 of the
replacement. If it is not necessary to replace all of the TVSs, carefully unpin the failed TVS(s).
4. Apply heat with a soldering iron to the opposite end of the TVS assembly so that the bad TVS(s)
can be removed. Use caution when applying heat to the solder joint to ensure that the remaining
TVSs aren’t damaged.
TVS2 Replacement
1. When installing new TVSs, cut the leads to 0.75 +0.00/-0.10 inches on both sides.
2. Crimp and solder each of the TVS banded side (cathode) leads to their specific sockets. Refer to
Figure 6-11.
3. Insert sockets into the 4-pin connector.
4. Install heat shrink around the four TVSs – this will help to hold them in place during the following
steps.
5. Solder the un-banded end of the TVS assembly together, as shown in Figure 6-12, onto a length of
18 AWG wire. Attach a terminal lug onto the wire end.
6. Carefully remove heat shrink installed in step 3 from the TVS, ensuring not to cut the insulation on
the wire under the heat shrink.
7. Attach an appropriately sized section of heat shrink to cover the soldered TVS leads and four TVS
pieces. A second appropriately sized (larger) section of heat shrink should then be attached to
shrink over the 4-pin connector with sockets and back over the four TVSs. These two pieces of
heat shrink should overlap along the entire length of the TVSs.
8. Mate the 4-pin connector together.
9. Reconnect the power end of the assembly to the power bus.
10. Reconnect the ground end of the assembly to ground.
11. Perform a polarity check per Section 6.9.2.1.
SOCKET CONTACT
CRIMP AND SOLDER
0.5"
MAX
Figure 6-11 Detail of TVS Pin Assembly
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Page 6-20
DETAIL OF TVS
HEAT SHRINK
ANODE
CATHODE
FUSE
HOLDER
0.44"
Max
SOLDER
TO
GROUND
TO POWER
BUS
0.75"
Max
Environmental Splice
TVS (Qty. 4)
4 Pin Connector
12.0"
Max
NOTE:
All four TVSs must be installed with the cathode facing the connector.
Figure 6-12 TVS2 Assembly
6.9.2.1 TVS2 Assembly Polarity Check
Using a multimeter that is set to the diode mode, check conductivity across the entire TVS2 assembly. In
one direction, the meter should read open, and in the other direction, it should read 2.0 to 2.5 volts. When
installed in the aircraft, the TVS assembly should be oriented so that it does not normally conduct from
power to ground. The meter should indicate open when the red lead is attached to the power bus terminal
lug and the black lead is attached to the ground terminal lug. The meter should indicate 2.0 to 2.5 volts
when the red lead is attached to the ground terminal lug and the black lead is attached to the power bus
terminal lug.
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Page 6-21
6.10 GPS/SBAS Antenna Cable Overbraid
The following removal and replacement steps are provided as guidance for replacing the cable overbraid
assembly. Refer to Figure 6-13.
Removal
1. Gain access to the GPS/SBAS antenna cable.
2. Disconnect the overbraid terminal lug from the shield block.
3. Disconnect the GPS coaxial cable connector at the GTN backplate.
4. Gain access to the GPS antenna and disconnect the antenna end of the coaxial cable.
5. Refer to the wire routing diagram and remove the entire cable assembly from the aircraft.
6. Remove the two visible electrical tie down connectors.
7. Unfold the overbraid that is doubled over and remove the remaining tie down connector.
8. Remove the antenna cable from the overbraid and visually inspect the cable insulation for damage.
Replacement
NOTE
The length of overbraid required for replacement of the assembly will be the length of the
GPS/SBAS antenna cable plus 6 inches. Refer to Figure 6-13 before beginning the
re-installation steps below.
1.
2.
3.
4.
5.
6.
7.
8.
9.
If the antenna cable insulation shows signs of damage, replace the cable.
Test the GPS coaxial cable for continuity. Replace the cable if it fails the continuity test.
Slide the new overbraid over the entire length of the GPS/SBAS antenna cable.
Roll back approximately 1.5 inches of the overbraid end at the antenna end.
Leaving the rolled-back portion free, secure the antenna end of the overbraid around the
GPS/SBAS antenna connector with an electrical tie-down strap.
Fold the free overbraid ends back over the tie-down strap and secure them to the cable with two
additional tie-down straps.
Re-install the cable in the aircraft and connect the cable to the GPS antenna.
At the GTN end of the overbraid, comb out a maximum of 2 inches of braid, twist it, cut to length
if necessary, and terminate with a #10 terminal lug.
Connect the remaining end of the antenna cable to the GTN and terminal lug to the P1001 shield
block ground.
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Page 6-22
NOTES:
1
THE OVERBRAID MUST BE INSERTED INTO THE GROUNDING LUG BY COMBING OUT AND
TWISTING THE WIRE STRANDS AND BEFORE TERMINATING THEM IN A TERMINAL LUG.
2
WHEN REINSTALLING OVERBRAID AT CONNECTOR END OF PIGTAIL, THE OVERBRAID IS
PUSHED DOWN UNTIL IT TOUCHES THE TOP SURFACE OF THE CONNECTOR.
CONTINUE PUSHING BRAID DOWN BY SPREADING IT OUT ALONG THE TOP SURFACE
OF THE CONNECTOR. APPLY THE FIRST CABLE TIE AROUND THE BRAID AND ANTENNA
CABLE WHERE IT ENTERS THE CONNECTOR. THEN LIFT THE SPREAD PORTION OF
THE BRAID UP TO COVER THE FIRST CABLE TIE, DOUBLING BACK ON ITSELF. INSTALL
THE REMAINING TWO CABLE TIES ABOVE THE BULGE CREATED BY THE FIRST CABLE
TIE WHICH IS NOW COVERED BY THE BRAID.
ANTENNA
CONNECTOR
GPS/SBAS ANTENNA
#8 TERMINAL LUG
MS25036-156
CONNECT TO P1001
SHIELD BLOCK
GROUND
CABLE TIE DOWN
MS3367-1-X
3 PLCS
1
1.5"
2
TO GPS ANTENNA CONNECTOR
ON GTN BACKPLATE
OVERBRAID DOUBLED BACK
ON SELF
2" MAX
OVERBRAID INTSTALLED OVER ENTIRE
LENGTH OF THE GPS ANTENNA CABLE
OVERBRAID
AIRCRAFT SPRUCE P/N 863
Figure 6-13 GPS/SBAS Antenna Cable Overbraid
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6.11 WXR HSDB Cable Overbraid
The following removal and replacement steps are provided as guidance for replacing the cable overbraid
assembly. The overbraid assembly drawing is shown in Figure 6-14.
Removal
1. Remove the radome to gain access to the GWX radar.
2. Disconnect the cable connector at the weather radar.
3. At the other end of the overbraid, disconnect the terminal ground lug from the bulkhead.
4. Remove the electrical tie-down strap.
5. Remove the backshell from the GWX weather radar connector.
6. Unpin the necessary cables from the GWX connector and pull the overbraid off of the wire.
Replacement
NOTE
The length of overbraid required is approximately equal to the length of the WXR cabling
in the radome area (measured from the bulkhead to the WXR R/T connector) plus 6 inches.
1. If any cable insulation shows signs of damage, replace the cable(s).
2. Slide the new overbraid over the HSDB cabling from the WXR R/T to the bulkhead.
3. At the bulkhead end of the overbraid, comb out a maximum of 2 inches of braid, twist it, cut to
length if necessary, and terminate with a MS20659-131 5/16" terminal lug.
4. With a NASM970-5 (AN970-5) 0.063” thick washer between the terminal lug and bulkhead,
secure the terminal lug to the existing bulkhead location.
5. At the WXR R/T end of the overbraid, fold 1 inch of overbraid back over itself. Position the
overbraid so that the fold will lie under the backshell cover plate, while the overbraid ends will lie
just outside the strain relief bar.
6. Re-pin the cables to the WXR connector and re-install the backshell cover plate and strain relief
bar.
7. Verify overbraid terminal bonding by checking the resistance between the overbraid and the
bulkhead. The resistance should be less than 2.5 mΩ.
CAUTION
All overbraid ends must be secured outside the backshell by the strain relief bar. Refer to
Figure 6-14. Failure to do so may allow the overbraid ends to contact and short HSDB
pins, resulting in weather radar malfunction or damage.
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Page 6-24
OVERBRAID
QQB575R30T0437
OR
QQB575F36T0781
OVERBRAID INSTALLED OVER WEATHER
RADAR CABLING THAT IS IN RADOME AREA,
PRIOR TO ENTERING THE METAL FUSELAGE
ELECTRICAL TIE-DOWN STRAP
MS3367-{1, 2, or 7}-X
OVERBRAID ENDS
Ensure that the
overbraid does not
protrude more than ¼”
past the strain relief bar
into the backshell.
ALL HSDB CABLING THAT ENTERS THE
METAL FUSELAGE
1
5/16" TERMINAL LUG
MS20659-131
WEATHER RADAR
CONNECTOR
NOTES:
1
THE OVERBRAID MUST BE INSERTED INTO THE GROUNDING LUG BY "COMBING" IT OUT
INTO A FLAT CONFIGURATION AND THEN COMPRESS INTO A SMALL DIAMETER BUNDLE
NEAR ITS END WHICH MAY BE INSERTED INTO THE GROUNDING LUG.
BULKHEAD
2" MAXIMUM
EXPOSED CABLE
OVERBRAID
Figure 6-14 WXR HSDB Cable Overbraid Details
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6.12 Instrument Panel Bonding Strap
The following steps are provided as guidance for replacing a damaged instrument panel bonding strap.
Reference the bonding strap hardware stack up in Figure 6-15.
Removal
The bonding strap is attached in two locations. The terminal lug is secured with a lock nut. To remove the
strap, access both sides of the instrument panel and the nearby structure and unbolt the hardware.
Replacement
NOTE
The instrument panel bonding strap should be as short as practical and must not exceed
6 inches in length.
1. Construct a bonding strap by attaching 5/16" inside diameter insulated terminal lugs
(MS20659-131) to both ends of the braid (3/4" tinned copper flat braid (QQB575F36T781) may
be used).
2. If needed, clean the attachment locations with a bonding brush.
3. Secure each end of the bonding strap to the previously installed locations. Ensure that the strap
does not loop back on itself and that the hardware is as shown in Figure 6-15. The washers must
seat fully against the aircraft metallic structure, without overhang or interference from other
hardware.
4. Using a milliohm meter, verify that the resistance between the connected structure is less than
2.5 mΩ.
BOLT
LUG
WASHER 1
WASHER 2
WASHER 3
WASHER 3
INSTRUMENT PANEL
LOCK NUT
Figure 6-15 Instrument Panel Bonding
Table 6-7 Instrument Panel Bonding Hardware
Hardware
P/N
Bolt
AN5-XA
Washer 1 (5/16" lock washer)
NASM35338-45
Washer 2 (5/16" flat washer)
NAS1149F0532P
Washer 3 (0.063" thick flat washer)
NASM970-5 or AN970-5
Locknut (5/16")
MS21042, MS20364, MS21045, or MS20365
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6.13 Flight Stream 210 Bonding Strap
The following removal and replacement steps are provided as guidance for replacing the Flight Stream
bonding strap. The bonding strap assembly drawing is shown in Figure 6-16.
NOTE
The aircraft structure side of the bonding strap may be mounted using a nut in lieu of a nut
plate. If a nut was used in lieu of a nut plate, further disassembly of the aircraft may be
required to gain access to the nut.
Removal
1. Disconnect one end of the bonding strap from the aircraft ground location.
2. Disconnect the other end of the bonding strap from the shield block on the Flight Stream connector
backshell.
3. Remove the bonding strap.
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Replacement
NOTE
The Flight Stream bonding strap should be as short as practical and must not exceed
20 inches. When installed, the bonding strap must not loop back on itself.
1. Construct a bonding strap no longer than 20 inches by attaching 10AWG terminal lugs to both
ends of 1/4" braid (QQB575R36T0250) or wider.
2. If needed, clean the attachment locations with a bonding brush.
3. Secure each end of the bonding strap to the previously installed locations. Ensure that the strap
does not loop back on itself and that the hardware is as shown in Figure 6-16. The washers must
seat fully against the aircraft metallic structure without overhang or interference from other
hardware.
4. Using a milliohm meter, verify that the resistance between the connected structure is less than
2.5 mΩ.
In the event of a bonding test failure, remove the bonding strap from the aircraft ground point and clean the
attachment point with a bonding brush. Re-install the bonding strap and perform the electrical bonding test
in accordance with Section 4.5 again.
5
2
1
3
6
4
2
3
4
3
Figure 6-16 Flight Stream Bonding
Table 6-8 Flight Stream Bonding Hardware
Refer to
Figure 6-16
1
Screw
Hardware
P/N
AN515, AN515B, or AN515C
2
Lock washer
MS35338-137
3
Flat washer
NAS1149CN832R or AN960C-8
4
Terminal Lugs
(7 AWG or 10 AWG depending on size of braid)
MS25036
5
Screw
MS51957-42
6
Braid
QQB575R36T0250
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7 EQUIPMENT CONFIGURATION AND TESTING
7.1 GTN 6XX/7XX................................................................................................................... 7-2
7.1.1 GTN Configuration Steps ............................................................................................. 7-4
7.1.2 GTN Ground Checks .................................................................................................... 7-4
7.2 GMA 35 .............................................................................................................................. 7-8
7.2.1 GMA 35 Audio Panel Configuration (GTN 7XX Only) .............................................. 7-8
7.2.2 GMA 35 Audio Panel Checkout (GTN 7XX Only) ..................................................... 7-9
7.3 Configuration Module....................................................................................................... 7-12
7.4 Interfaced Equipment........................................................................................................ 7-13
7.4.1 Navigation Indicator ................................................................................................... 7-13
7.4.2 Serial Tuned DME ...................................................................................................... 7-16
7.4.3 Displays ...................................................................................................................... 7-16
7.4.4 Transponder ................................................................................................................ 7-20
7.4.5 Traffic or Weather System.......................................................................................... 7-21
7.4.6 Weather Radar ............................................................................................................ 7-23
7.4.7 GDL 88 ....................................................................................................................... 7-24
7.4.8 Fan Interface Check .................................................................................................... 7-24
7.4.9 Flight Stream 210/510 Interface Checks .................................................................... 7-24
7.5 Enabled Features............................................................................................................... 7-26
7.5.1 Terrain Configuration and Checks (For Units with Terrain Alerting/TAWS Only) .. 7-26
This section provides procedures to be followed after an LRU is replaced. At the beginning of each LRU
section, instructions are given to guide the technician for various removal and replacement scenarios.
These instructions define necessary procedures to be followed for situations in which original equipment
was re-installed, as well as for situations in which new equipment (i.e., new serial number) is installed.
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7.1 GTN 6XX/7XX
Original GTN 6XX/7XX Re-installed
If the removed GTN is installed in its original position, no software loading or configuration setting
changes are required. This does not include units that were returned for repair, as their software and
configuration files are deleted during the repair testing progress. It is recommended to perform the
Connector Engagement Check to ensure that the GTN is properly seated to the connectors. Refer to
Section 7.1.2.1.
New, Repaired, or Exchanged GTN Installed
If a new, repaired, or exchanged GTN is installed, the correct software must be loaded to the unit. Some
configuration files must be set. Refer to the summary in Table 7.1. Any enabled features, such as TAWS B
or ChartView, will not need to be re-enabled if the configuration module was left in the aircraft.
This section covers the necessary steps to configure and test a replacement GTN unit. The steps provided
in this section are only applicable for replacement of an equivalent GTN unit (e.g., 750 for 750, 625 for
625, etc.). If wiring updates are needed, or the configuration module is being replaced simultaneously,
refer to GTN 6XX/7XX Part 23 AML STC Installation Manual for installation instructions.
Table 7-1 Configuration and Checkout Procedures
Modification
Required Action
Affected Models
New units or units returned from the factory will
include a different COM squelch calibration
procedure. If the unit replaced was configured
prior to July 2014, it is likely that the COM
squelch settings should be re-evaluated prior to
returning to service. Verify COM squelch is
acceptable per Section 7.1.2.4.
Repeat configuration steps described in
Section 7.1.1.1 (COM Configuration).
Replacing GTN with
equivalent unit
Repeat configuration steps described in
Section 7.4.1.1.2 (VOR/LOC/GS Configuration)
and Section 7.4.2.1 (Serial Tuned DME
Configuration).
GTN 6XX/7XX
Perform ground checks per Section 7.1.2 (GTN
Ground Checks), Section 7.4.1.2.2 (VOR/ILS/GS
Indicator) and Section 7.4.2.2 (Interface Check).
Ensure that the GTN software is the specified
version on the GTN Part 23 AML STC Equipment
List (P/N 005-00533-C1). Ensure that the
Basemap, Navigation, SafeTaxi, and Obstacle
databases are up-to-date per Section 3.4 and
insert SD card from previous GTN into the
replacement unit.
Replacing configuration
module with new module
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Database cards need to be recreated when
updating the configuration module. Refer to
Section 3.4 for instructions regarding database
updates.
GTN 6XX/7XX
Feature enablements must be reactivated. A new
feature enablement card is required. Contact
Garmin for a new feature enablement card.
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Modification
Replacing navigation
indicator
Required Action
Repeat calibration per section Section 7.4.1.1.1.1
(OBS Resolver Calibration) (if using GPS) or
Section 7.4.1.1.2.1 (Calibrate Resolver) if using
VOR/LOC/GS receiver.
Affected Models
GTN 6XX/7XX
Refer to Section 7.2.1 for configuration steps.
Replacing GMA 35
Perform checkout procedures per Section 7.2.2.
Ensure that the GMA software is the specified
version on Equipment List, GTN 6XX/7XX Part 23
AML STC (P/N 005-00533-C1).
GMA 35
Refer to Section 7.2.1 for configuration steps.
Perform checkout procedures per Section 7.2.2.
Replacing GMA 35c
Perform the connector engagement check. Refer
to Section 7.1.2.1 for details. Ensure that the
GMA software is the specified version on
Equipment List, GTN 6XX/7XX Part 23 AML STC
(P/N 005-00533-C1).
GMA 35c
Replacing a serial tuned DME
Perform interface check per Section 7.4.2.2
(Interface Check).
GTN 650/750
Replacing a display
Perform the appropriate interface check per
Section 7.4.3 (Displays).
GTN 6XX/7XX
Replacing a transponder
Configure remote transponder per
Section 7.4.4.1 (Remote Transponder
Configuration).
GTN 6XX/7XX
Perform interface check per Section 7.4.2.2
(Interface Check).
Replacing altitude encoders,
air data computers, or fuel-air
data computers
No action required.
GTN 6XX/7XX
Replacing traffic system or
weather system
Perform the appropriate interface check per
Section 7.4.5.
GTN 6XX/7XX
Replacing weather radar
Perform the appropriate interface check per
Section 7.4.6.
GTN 725/750
Replacing fan
Perform the fan interface check per Section 7.4.8
(Fan Interface Check).
GTN 6XX/7XX
Replacing a
Flight Stream 210
No configuration/interface checkout procedures
are required to return to service.
Flight Stream 210
Replacing a
Flight Stream 510
Update databases as necessary, as described in
Section 3.4.
Flight Stream 510
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7.1.1 GTN Configuration Steps
7.1.1.1 COM Configuration Page (GTN 635/650/750 Only)
Select the COM Configuration page from the GTN Setup page. These values are set at the factory and
rarely require calibration.
To enable or disable the COM radio, touch the COM key to toggle between Enabled and Disabled. The
COM radio defaults to the enabled state.
Review the COM configuration settings on the GTN and compare them against the GTN Configuration
and Checkout Log. A copy of the GTN Configuration and Checkout Log form may be found in the
appendices of this document. If any of the settings differ from the checkout log, update the settings to the
correct value. For information regarding individual settings, refer to GTN 6XX/7XX Part 23 AML STC
Installation Manual.
7.1.1.2 Enabled Features
Refer to Section 7.5 for instructions on feature enablement. If the configuration module is not replaced, the
enabled features will be retained upon replacing the GTN.
7.1.2 GTN Ground Checks
Ground checks of the GTN require the GTN to be powered up in Configuration mode, as described in
Section 3.3.
7.1.2.1 Connector Engagement Check
Prior to configuration and checkout of the GTN, the connector engagement should be checked as described
below:
1. Ensure that the GTN GPS/NAV and COM circuit breakers are open.
2. Slide the GTN straight into the rack until it stops about 1 inch short of the fully seated position.
3. Insert a 3/32" hex drive into the unit retention mechanism access hole at the bottom of the unit face
and turn the tool clockwise while pressing the bezel until the unit is firmly seated in the rack.
4. With the GTN seated, reapply power by closing the circuit breakers and turning on the avionics
master switch (if installed).
5. Insert the hex drive into the unit retention mechanism access hole. Turn the tool counterclockwise
to back out the retention mechanism. Ensure that three complete revolutions of the Allen screw
can be performed without a red “X” indication or loss of power to the GTN.
NOTE
If power is lost, or the red “X” condition occurs with fewer than three turns, ensure there
are no obstructions to the unit fully seating in the rack. The mounting rack may need to be
moved aft (i.e., toward the pilot) such that the aircraft panel does not obstruct the unit
from properly engaging in the rack.
6. Open the circuit breakers to remove power from the unit and re-seat the GTN per step 3. Close the
breakers to restore power to the unit.
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7.1.2.2
Signal Acquisition Check
NOTE
All other avionics should be turned off at the start of this test, with the GTN powered on in
Normal mode. After re-installation, the initial acquisition of position can take up to
20 minutes. Subsequent acquisitions will not take as long.
NOTE
For best results, this check should be performed outdoors away from large buildings or
objects that could obstruct the GPS antenna.
Ensure the GTN is able to acquire sufficient satellites to compute a GPS position. From the Home page,
touch the System key and then touch the GPS Status key. Under GPS Solution, ensure that a “3D Fix” or
“3D Diff Fix” is obtained. If the unit is unable to acquire satellites, move the aircraft away from
obstructions that might be shading GPS reception. If the GPS solution does not improve, check the GPS
antenna installation.
Once GPS position information is available, verify that the LAT/LON agree with a known reference
position.
7.1.2.3 Receiver/Transmitter Operation (GTN 635/650/750 Only)
Tune the unit to a local VHF frequency and verify the receiver output produces a clear and understandable
audio output. Verify the transmitter functions properly by contacting another station and getting a report of
reliable communications.
7.1.2.4
COM RX Squelch Check (GTN 635/650/750 Only)
NOTE
COM RX Squelch was referred to as COM RF Squelch in software versions prior to v6.50.
The COM RX Squelch settings allow adjustment of the noise signal strength required to
break squelch for the COM receiver.
In late 2013, Garmin changed the GTN COM radio factory calibration process to allow the level at which
the auto squelch opens or closes to be set at a more sensitive level. The COM RX squelch range (0-100)
was remapped, as shown in Table 7-2. Installations of radios with the expanded sensitivity calibration
process may require a different COM RX Squelch setting to achieve the desired RX squelch performance.
All current production units are shipped with the expanded sensitivity calibration process.
Approximate levels when the auto squelch opens and closes for various COM RX squelch settings is
provided in Table 7-2. Installations of GTNs with the expanded sensitivity calibration will generally use a
COM RX Squelch setting of 75 or higher. Installations of GTNs with the original sensitivity calibration
will generally use a COM RX squelch setting of 0 or higher.
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Table 7-2 Summary of COM RX Squelch Settings and Auto Squelch Levels
Original
Calibration
Approximation
Expanded Calibration
Approximation
Auto Squelch open
-99 dBm
-105 dBm
Auto Squelch close
-101 dBm
-107 dBm
Auto Squelch open
-97 dBm
-99 dBm
Auto Squelch close
-99 dBm
-101 dBm
Auto Squelch open
-93 dBm
-93 dBm
Auto Squelch close
-95 dBm
-95 dBm
COM RX Squelch Setting
0
75
100
To set the COM Squelch setting, tune the COM to a local COM frequency. Verify squelch breaks when the
pilot begins talking. If the squelch breaks too early, increase the value. If it does not open when the pilot
begins speaking over the radio, decrease the value.
COM Carrier Squelch Check (GTN Main Software v6.50 or Later, COM v2.30 or Later)
COM carrier squelch settings allow adjustment of the carrier signal strength required to break squelch for
the COM receiver.
The COM carrier squelch level adjustment reduces the sensitivity of the COM receiver. Elevated, ambient
RF interference levels in certain flight environments, such as aircraft operating busy airport environments
or aircraft with equipment installed that interferes with the COM radio, may require adjustment of the
COM carrier squelch to reduce undesired squelch breaks.
Table 7-3 COM Carrier Squelch Selections
Selection
Description
Basic
Applies a COM carrier squelch value of 0 to 25 kHz and 8.33 kHz spacing.
Advanced
Allows the adjustment of COM carrier squelch values.
Spacing
Allows the adjustment of COM carrier squelch values for 25 kHz and 8.33 kHz
spacing separately.
Squelch
The COM carrier squelch is adjustable in the range of 0 to 100. The default value is
0. Decreasing the value allows the carrier squelch to be broken with low signal
levels. Increasing the value requires higher signal levels to break carrier squelch.
Table 7-4 lists approximate levels when the carrier squelch opens for various COM Carrier Squelch
settings. Installations requiring adjustment generally use a COM carrier squelch setting of 33 or higher for
25 kHz spacing and 0 for 8.33 kHz spacing.
Table 7-4 COM Carrier Squelch Selections
COM RF Squelch
Setting [1]
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Carrier Squelch Open Approximation
25kHz Spacing
8.33 kHz Spacing [3]
0 [3]
-96 dBm
-94 dBm
33
-93 dBm
-91 dBm
55 [2]
-91 dBm
-89 dBm
66
-90 dBm
-88 dBm
100
-87 dBm
-85 dBm
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Notes:
[1] The COM carrier squelch range (0-100) is a linear response.
[2] Many aviation COM radios have the carrier squelch set to open at approximately -91 dBm in
25 kHz spacing and -94 dBm in 8.33 kHz spacing.
[3] Setting the 8.33 kHz COM carrier squelch value to 0 ensures compliance with ETSO-2C169a.
When the 8.33 kHz COM carrier squelch is set to a non-zero value, the COM receiver may not
meet the multi-carrier sensitivity requirement of 3.1.3.2 of ED-23C.
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7.2 GMA 35
The following steps must be performed when replacing a GMA 35 Audio Panel:
1. Configure audio panel per Section 7.2.1.
2. Perform ground check per Section 7.2.2.
7.2.1 GMA 35 Audio Panel Configuration (GTN 7XX Only)
7.2.1.1 GMA 35 Audio Panel Settings
In Configuration mode, touch the External Systems key (refer to Figure 3-8) followed by the Audio
Panel key. The Audio Panel page (Figure 7-1) will be displayed. Touch the Configure key to access
configuration settings for audio routing, volume, and miscellaneous options. Refer to Figure 7-1. Touch
Back to return to the Audio Panel page.
Touch the Connected Radios key to set the status (Present or Not Present) of COM 2, COM 3, NAV 1,
NAV 2, RCVR 3, RCVR 4, RCVR 5, TEL, Music 1, Music 2, and Marker Beacon. Touch Back to return
to the Audio Panel page.
Review the GMA 35 Audio Panel configuration settings on the GTN and compare them against the GTN
Configuration Log. A copy of the GTN Configuration Log form may be found in the appendices of this
document. If any of the settings differ from the checkout log, update the settings to the correct value. For
information regarding individual settings, refer to GTN 6XX/7XX Part 23 AML STC Installation Manual.
Figure 7-1 Audio Panel Page
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7.2.2 GMA 35 Audio Panel Checkout (GTN 7XX Only)
7.2.2.1 GMA 35 Interface Check (GTN 7XX Only)
1. With the GTN running, and the GMA 35 Audio Panel powered on, go to the home page and touch
the Audio Panel key.
2. Ensure that a red “X” is not displayed over the Audio Panel key.
After configuring the audio panel, an in-aircraft checkout may be performed with a good microphone,
headset, speaker, and avionics receivers. For testing the marker beacon, use a ramp tester that transmits a
75 MHz marker beacon test signal.
For instructions on how to operate the GMA 35 in Normal mode during checkout procedures, refer to
GTN 725/750 Pilot’s Guide.
NOTE
In the following procedural steps, allow for variation in the configuration settings for the
particular installation under test.
7.2.2.2 GMA 35c Bluetooth Audio Check
While on the ground, turn on the GTN and GMA 35c. A compatible Bluetooth-capable device is required.
NOTE
To verify telephone audio, a Bluetooth-compatible phone is required.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Go to the GMA 35c page by touching System → Connext Setup → GMA 35c.
Ensure Bluetooth is enabled.
On the PED, view the list of available Bluetooth devices.
Select the device that matches the Bluetooth name shown on the GTN screen.
Verify the PED is paired with the GTN. A green check mark is displayed by the paired device.
Touch Intercom on the GTN 725/750.
Touch Bluetooth Audio and set distribution to Pilot, Copilot, and Passenger.
Touch Radio to mute Bluetooth during radio transmissions.
Touch Intercom to mute Bluetooth during intercom transmissions.
Verify audio from PED is distributed to the selected positions.
Tune and monitor a COM frequency to ensure communications over the radio are easily heard
over the audio.
NOTE
If different values are used for the telephone and audio volume settings, repeat this
procedure while making a call from a Bluetooth-compatible phone.
12. Adjust the Bluetooth volume as necessary.
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7.2.2.3 Failsafe Operation Check
1. Power the GMA 35 off by opening the audio panel circuit breaker.
2. Check the failsafe operation by exercising the COM1 microphone, microphone key, and audio
over the pilot’s headphones.
NOTE
Use of a true mono headset is required for this test to ensure proper wiring, even if a
stereo jack is provided in the installation. Wiring left channel (tip contact) and right
channel (ring contact) backwards will cause Failsafe mode not to function with mono
headsets. Use of a true mono headset is required for this test (not a stereo headset with a
mono/stereo switch because headset manufactures differ on how they accomplish this
switching). This will guarantee the condition of the right channel (ring terminal) being
shorted to the return (sleeve terminal) by the mono headset’s plug. During power-on
operation, this short will not damage the audio panel.
3. Verify that COM1 can key and transmit the pilot’s mic audio by verifying received sidetone or
checking reception of the transmission with another radio tuned to receive this transmission (verify
Pilot PTT and mic operation is delivered to this transceiver).
4. Turn the unit back on to continue testing.
NOTE
If the configuration setting COM 1 is Connected as COM 2 is set to True, then the
COM 2 microphone should be exercised rather than COM 1.
7.2.2.4 COM Transceiver Operational Check
1. Connect a headset to the pilot’s headset output and mic input jack.
2. Verify that each installed transceiver (COM) can be heard when selected.
NOTE
Depending on configuration settings, the mic selected COM may mute audio from other
COMs.
3. Verify that each installed transceiver keys for transmission and transmits clear audio from the
pilot’s mic when selected for transmission and the pilot PTT key is pressed. Verifying
transmission with a separate radio that is not in the system is recommended because the audio
panel can be configured to simulate received sidetone internally.
NOTE
Depending on configuration settings, other transceivers may be muted during transmit.
The audio panel may mute the speaker during PTT.
4. Move the headset to the copilot’s headset jacks and verify that any one of the installed transceivers
(testing each is not necessary) receives and transmits copilot mic properly as above.
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7.2.2.5 NAV Audio Check
Ensure the GMA 35 and each installed NAV receiver is powered on.
1. Tune the NAV receiver to a local VOR station.
2. Ensure the Morse code identifier is being received over the crew headsets.
3. If the audio is not heard, verify the wiring to the audio panel.
4. Ensure the audio volume is sufficient for all anticipated cockpit noise conditions.
Repeat steps 1 through 4 for each installed NAV receiver.
7.2.2.6 Alert Audio Check
If there is an alert audio source connected to the GMA 35, the interface should be verified as described
below:
1. Cause the alert audio source to produce audio (e.g., if a traffic system is installed, command the
traffic system into Self-Test mode; if a TAWS system is installed, command the TAWS system into
Self-Test mode).
2. Verify that the alert audio source is heard in the pilot and copilot headsets and that the audio
volume is sufficient for all anticipated cockpit noise conditions. Adjust the audio volume level as
needed. For modification of configuration settings, refer to GTN 6XX/7XX Part 23 AML STC
Installation Manual.
3. If the alert audio source is not heard in the crew headsets, check the wiring from the source to the
GMA 35 alert audio inputs.
Repeat steps 1 through 3 for each alert audio source connected to the GMA 35.
7.2.2.7 Receiver Audio Check
If there are receiver audio sources connected to the GMA 35, the interface should be verified as described
below. Ensure the GMA 35, as well as each interfaced receiver (e.g., DME, ADF, etc.), is powered on.
1. Plug in a headset at pilot and copilot position.
2. Tune the installed receiver to a valid station.
3. Ensure audio is being received over the crew headsets.
4. Ensure the audio volume is sufficient for all anticipated cockpit noise conditions. Adjust the audio
output level as needed at the receiver.
Repeat steps 2 through 4 for each installed receiver.
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7.2.2.8
Intercom System (ICS) Check
NOTE
If a mono headset is plugged into a stereo phone jack position, damage will not occur to
the GMA 35. If a passenger plugs a mono headset in any passenger position, stereo
listeners will lose one channel.
1. Place the audio panel into ALL ICS mode (refer to GTN 725/750 Pilot’s Guide) so that all ICS
positions hear all others.
2. De-select or turn off other audio sources (e.g., MKR, transceivers, receivers, alerts). Some
configurations may mute passenger intercom audio to crew when aircraft audio is present.
3. From the pilot headset position, verify the pilot, copilot, and all passenger mic inputs can be heard
in the pilot’s headset when speaking into the mic input under test (adjust pilot ICS volume, if
necessary).
4. Speak into the pilot’s mic and verify that pilot mic audio is heard in the copilot headset (adjust
copilot ICS volume, if necessary) and in each passenger headset (adjust passenger ICS volume, if
necessary).
7.2.2.9 Music System Check (if installed)
1. Set the intercom to the ALL mode.
2. Connect a stereo audio source to MUSIC 1 or MUSIC 2. Verify that stereo audio is heard over the
pilot headset position.
3. Tune a station on COM 1 and verify that the sound is muted by active COM 1 audio (break squelch
on COM 1, if necessary).
4. Verify that stereo audio is heard in the passenger headsets.
7.3 Configuration Module
Upon replacing a configuration module with a new configuration module unit, no further action is
required. Installation of a used configuration module is not recommended.
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7.4 Interfaced Equipment
This manual does not cover the removal/replacement of the following interfaced equipment. However, the
following procedures are required to ensure proper functionality with the interfaced equipment. Perform
the following calibration procedures and interface checks after re-installing or replacing any of the
optionally interfaced equipment.
7.4.1 Navigation Indicator
1. Perform calibration per Section 7.4.1.1.1.1 (if using GPS) or Section 7.4.1.1.2.1 (GTN 650/750
only) if using VOR/LOC/GS receiver.
2. Perform ground checks per Section 7.4.1.2 and the appropriate interface check.
7.4.1.1 Navigation Indicator Calibration
7.4.1.1.1 Main Indicator (Analog) Configuration Page
Select the Main Indicator (Analog) Configuration page, shown in Figure 7-2, from the GTN Setup page.
This page allows you to calibrate the OBS resolver, configure the CDI key, selected course for GPS and
VLOC, as well as the V-Flag state. Configurable fields are described in the following sections.
Figure 7-2 Main Indicator (Analog) Configuration Page
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7.4.1.1.1.1 Main Indicator OBS Resolver Calibration
To calibrate the OBS resolver, touch the Calibrate key from the Main Indicator Configuration page.
Next, select 150˚ on the External CDI/HSI then touch the OK key, as prompted on the display. After the
OBS resolver has completed calibrating, the GTN will display, “OBS Resolver Calibration Complete!”
Touch OK after the calibration is complete. Verify OBS operation by checking that the selected course
displayed at the top of the page is within 2° of the selected course.
The Main Indicator (Analog) Configuration page allows the CDI connected to the NAV board (P1001) to
be ground checked and allows the NAV indicator interface to be verified. Refer to Section 7.4.1.2.1 for the
ground check.
7.4.1.1.2
VOR/LOC/GS Configuration Page
(GTN 650/750 Only)
Select the VOR/LOC/GS key on the GTN Setup page. This
page allows you to verify the CDI outputs from the
VOR/LOC/GS receiver as well as the OBS resolver input to
the VOR receiver. It allows you to select the format for the
DME tuning data.
7.4.1.1.2.1 Calibrate OBS Resolver
To calibrate the OBS resolver, touch the Calibrate key from
the VOR/LOC/GS Configuration page. Next, select 150˚ on
the external CDI/HSI, then touch the OK key when
prompted by the display. Touch OK after calibration is
complete. Verify OBS operation by checking that the
selected course displayed at the top of the page is within 2°
of the selected course.
Figure 7-3 VOR/LOC/GS
Configuration Page
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7.4.1.2 Navigation Indicator Ground Checks (Configuration Mode)
7.4.1.2.1 Main Indicator Check (Analog Only)
NOTE
If the GTN is interfaced to an electronic HSI/EFIS, and the main indicator analog output
is not used, this check is not required.
NOTE
To verify if the indicator is interfaced with the GTN on the main connector (P1001),
examine the response of the indicator during the GTN self-test upon power-up. If the
indicator responds according to the values described on the screen, then it is connected to
the main connector.
If the GTN is interfaced to an analog indicator on the main connector (P1001), perform the following steps
in Configuration mode. Refer to Section 3.3.
1. From the Configuration Mode page (Figure 3-8), touch GTN Diagnostics key.
2. Touch the Main Indicator (Analog) key.
3. Verify correct operation of the lateral deviation, flag, and TO/FROM flag using the corresponding
selections.
4. Verify correct operation of the vertical deviation and flag using the corresponding selections.
5. Verify correct operation of the OBS knob using the OBS Resolver Setting display. At 30°
increments around the OBS card, ensure that the indicated value is within 2° of the value set on the
indicator. If the resolver is not within 2°, calibrate the resolver as described in Section 7.4.1.1.1.1.
7.4.1.2.2 VOR/LOC/GS Indicator
If the GTN is interfaced to an analog indicator on the VOR/ILS connector (P1004), perform the following
steps:
1. From the Configuration Mode page (Figure 3-8), touch GTN Diagnostics key.
2. Touch the VOR/ILS Indicator (Analog) key.
3. Verify correct operation of the lateral deviation, flag, and TO/FROM flag using the corresponding
selections.
4. Verify correct operation of the vertical deviation and flag using the corresponding selections.
5. Verify correct operation of the OBS knob using the Selected Course display. At 30° increments
around the OBS card, ensure that the indicated value is within 2° of the value set on the indicator.
If the resolver is not within 2°, calibrate the resolver as described in Section 7.4.1.1.2.1.
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7.4.2 Serial Tuned DME
7.4.2.1 Serial Tuned DME Configuration
Under the VOR/LOC/GS Configuration page, set the DME mode and DME Channel mode to the values
specified in the configuration checkout log. Configuration of these settings is required if exchanging
GTN 650/750 units, but is not required if replacing a DME with an equivalent unit.
7.4.2.2 Interface Check (650/750 Only)
Verify the interface performing the following steps:
1. Select a VOR/ILS channel that corresponds to (1) a DME station within a 40 nautical mile range or
(2) the frequency of a DME ground tester.
2. Verify that the DME locks on to the signal and a valid distance is displayed.
3. Tune an invalid VOR station. Verify that the DME data is flagged.
4. If multiple GTNs are set up to remotely channel a DME, repeat steps 1-3 using the other GTN.
7.4.3 Displays
Perform the appropriate interface check for the replaced EHSI, EFIS, PFD, or MFD. No additional
configuration on the GTN is required when replacing a display with an equivalent unit.
7.4.3.1 Honeywell (Bendix/King) EFS 40/50 Interface Check
If a Honeywell EFS 40/50 has been connected to the GTN, the interface should be verified as described in
this section.
1. Cycle power to the first GTN and acknowledge the prompts until on the Instrument Panel
Self-Test page (refer to Section 6.1.1).
2. Ensure that GPS1 data displays by pressing the 1-2 key on the EFS 40/50 control panel.
3. While the GTN displays the Instrument Panel Self-Test page, verify that the EFS 40/50 displays
data from the GPS source:
 Course Deviation: Half-scale left deviation, TO indication, flag pulled
 Active Waypoint: GARMN
 Vertical Deviation: Half-scale up deviation (only if installation is setup to display GPS vertical
deviation)
4. On the GTN, verify that an OBS value displays and is not dashed out.
5. Using a VOR test set, verify that the CDI deviation on the EFS 40/50 displays correctly.
6. Cycle power to the second GTN and acknowledge the prompts until on the Instrument Panel
Self-Test page.
7. If a second GTN is installed, switch to GPS2 data by pressing the 1-2 key on the EFS 40/50 control
panel and repeat steps 3 through 5 with GTN #2.
7.4.3.2 Sandel SN3308 Interface Check
If a Sandel EHSI has been connected to the GTN, the interface should be verified as described in one of the
following sections, as appropriate for the installation.
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7.4.3.2.1 One GTN/One SN3308
1. Cycle power to the GTN and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
2. Ensure that the SN3308 receives valid heading.
NOTE
The Vertical Deviation Indication will not be displayed unless the SN3308 is receiving
valid heading.
3. While the GTN is displaying the Instrument Panel Self-Test page, verify that the SN3308 displays
the following data from the GPS source:
 Course Deviation: Half-scale left deviation, TO indication, flag pulled
 Vertical Deviation: Half-scale up deviation, flag pulled
 Active Waypoint: GARMN
4. On the GTN, verify that an OBS value displays and is not dashed out.
5. Acknowledge the self-test on the GTN by touching the Continue key.
6. Select VLOC on the GTN and verify that the SN3308 displays NAV 1 or NAV 2 (depending on
the GTN navigation source configuration).
7. Using a VOR test set, verify that the CDI deviation on the SN3308 displays correctly.
7.4.3.2.2 Two GTNs/One SN3308
1. Remove power from GTN #2 by opening up the circuit breaker.
2. Cycle power to GTN #1 and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
3. Select GPS1 as the navigation source by pressing the NAV key on the SN3308. Verify that “GPS1”
displays on the SN3308.
4. Ensure that the SN3308 receives valid heading. The Vertical Deviation Indication will not display
unless the SN3308 receives valid heading.
5. While GTN #1 displays the Instrument Panel Self-Test page, verify that the SN3308 displays the
following data from GPS1:
 Course Deviation: Half-scale left deviation, TO indication, flag pulled
 Vertical Deviation: Half-scale up deviation, flag pulled
 Active Waypoint: GARMN
6. On GTN #1, verify that an OBS value displays and is not dashed out.
7. Acknowledge the self-test on GTN #1 by touching the Continue key.
8. Select VLOC on GTN #1 and verify that the SN3308 displays “NAV 1” or “NAV 2” depending on
which navigation source the GTN is.
9. Using a VOR test set, verify that the CDI deviation on the SN3308 displays correctly.
10. Remove power from GTN #1 and apply power to GTN #2. Acknowledge the prompts until the
Instrument Panel Self-Test page displays. Refer to Section 6.1.1. Select GPS2 by pressing the
NAV key on the SN3308.
11. Repeat steps 5 through 9 with GTN #2.
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7.4.3.2.3 Two GTNs/Two SN3308s
1. Remove power from GTN #2.
2. Cycle power to GTN #1 and acknowledge the prompts until on the Instrument Panel Self- Test
page (refer to Section 6.1.1). Select GPS1 as the navigation source by pressing the NAV key on the
SN3308 #1. Verify that “GPS1” displays on the SN3308.
3. Ensure that the SN3308 receives valid heading. The Vertical Deviation Indication will not display
unless the SN3308 receives valid heading.
4. While GTN #1 displays the Instrument Panel Self-Test page, verify that the SN3308 displays the
following data from GPS1:
 Course Deviation: Half-scale left deviation, TO indication, flag pulled
 Vertical Deviation: Half-scale up deviation, flag pulled
 Active Waypoint: GARMN
5. On GTN #1, verify that an OBS value displays and is not dashed out.
6. Acknowledge the self-test on GTN #1 by touching the Continue key.
7. Select VLOC on GTN #1 and verify that the SN3308 displays “NAV 1” or “NAV 2” depending on
which navigation source the GTN is.
8. Using a VOR test set, verify that the CDI deviation on the SN3308 displays correctly.
9. Remove power from GTN #1 and apply power to GTN #2. Acknowledge the prompts until the
Instrument Panel Self-Test page displays (refer to Section 6.1.1).
10. Select GPS2 by pressing the NAV key on the SN3308.
11. Repeat steps 4 through 8 with GTN #2.
Perform the same procedure for the second SN3308. Ensure that SN3308 #2 receives valid heading by
ensuring the vertical deviation indication displays.
7.4.3.3 Sandel SN3500/4500 Interface Check
If a Sandel SN3500/4500 EHSI has been connected to the GTN, the interface should be verified as
described in this section.
1. Cycle power to the GTN and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
2. Ensure that the SN3500/4500 receives valid heading. The Vertical Deviation Indication will not
display unless the SN3500/4500 is receiving valid heading.
3. While the GTN displays the Instrument Panel Self-Test page, verify that the SN3500/4500
displays data from the GPS source:
 Course Deviation: Half-scale left deviation, TO indication, flag pulled
 Vertical Deviation: Half-scale up deviation, flag pulled
 Active Waypoint: GARMN
4. On the GTN, verify that an OBS value displays and is not dashed out.
5. Acknowledge the self-test on the GTN by touching the Continue key.
6. Select VLOC on the GTN and verify that the SN3500/4500 displays “NAV 1” or “NAV 2”
depending on which navigation source the GTN is.
7. Ensure that the NAV1 (or NAV2) indication does not have a red line through it.
8. Repeat steps 3 through 7 for GTN #2, if installed.
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7.4.3.4 EHSI Deviation Scaling for HSI/CDI Driven by GTN through ARINC 429 Data
If the GTN has a serial connection to an EFIS display, proper scaling of the EFIS CDI and VDI must be
verified.
1. Cycle power to the GTN and acknowledge the prompts until on the Instrument Panel Self-Test
page (refer to Section 6.1.1).
2. With the Instrument Panel Self-Test page displayed on the GTN, look on the EHSI/EFIS and
verify that the lateral deviation is half-scale left and not flagged.
3. With the Instrument Panel Self-Test page displayed on the GTN, look on the EHSI/EFIS and
verify that the vertical deviation is half-scale up and not flagged.
7.4.3.5 GMX200/MX20 Interface Check
The Garmin GMX 200 or MX20 interface should be verified as described in this section.
1. Ensure that the GTN has a 3-D position fix.
2. Create and activate a flight plan on the GTN by touching the Direct-To key and entering a
waypoint.
3. Verify that the RTE and POS data flags does not display on the GMX 200/MX20.
4. Verify that the flight plan displays on the GMX 200/MX20 using the flight plan (FPL) function.
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7.4.4 Transponder
1. For remote transponders, configure transponder per Section 7.4.4.1.
2. Perform interface check per Section 7.4.4.2.
7.4.4.1 Remote Transponder Configuration
A remote transponder can be configured by the GTN through RS-232 if a transponder is configured for one
of the RS-232 ports. To configure the transponder, it must first be selected as Present and the type of
transponder installed must be specified. To do this, access the Interfaced Equipment page on the
GTN Setup page (Figure 3-11). Next, go to the External Systems page and touch the XPDR key. This
displays the page shown in Figure 7-4, which allows the remote transponder to be configured. The remote
transponder should be configured in accordance with the installation manual for that specific transponder.
NOTE
If the GTN controls any transponder (GTX 3XX/3XXR), then that transponder will boot
into the same mode (Normal or Configuration) as the GTN.
NOTE
If the GTN is not communicating with the GTX transponder, all of the editable fields for
the setup items shown in the following sections will be dashed out. If the fields are dashed
out, check the wiring and pin connections from the GTN to the transponder.
NOTE
The GTX 335R/345R must be configured through the GTX 3X5 Install Tool. Refer to
GTX 3X5 TSO Installation Manual for more information.
NOTE
The GTN can interface to the GTX 3XX; however, configuration of the panel-mounted
GTX 3XX is not supported. These transponders should be configured per their installation
manuals rather than through the GTN.
Figure 7-4 XPDR1 Configuration Page
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7.4.4.2 Transponder Interface Check
If the GTN is interfaced to a GTX 32/33/3X5R remote transponder, or a GTX 3XX configured as a remote
transponder, the following checks must be completed:
1. With the GTN unit running in Normal mode, and the transponder powered on, go to the home page
and ensure there is not a red “X” over the transponder data field on the screen.
2. Check that a code can be entered into the Code field. Enter a code using the keypad and then touch
the Enter key. Check that the code that was entered is displayed in the Transponder Data field.
3. If dual transponders are installed, select Transponder 2 and perform steps 1 and 2 for the second
transponder as well.
4. To verify wiring is not crossed, open the Transponder 1 circuit breaker and verify the
Transponder 1 data field has a red “X”.
5. Repeat the steps 1 through 3 for GTN #2.
7.4.5 Traffic or Weather System
Perform the appropriate interface check for the traffic or weather system. Additional GTN configuration
steps are not required for replacing a traffic or weather device with an equivalent unit.
7.4.5.1 Ryan TCAD Traffic System Interface Check
If a Ryan TCAD has been connected to the GTN 6XX/7XX unit, the traffic interface should be verified as
described in this section.
1. Go the Traffic page on the GTN from the Home page group.
2. Verify that “NO DATA” is not displayed in yellow in the center of the Traffic page.
3. Using the SHIELD SETUP under the Traffic menu, verify that the shield mode can be changed.
7.4.5.2 ARINC 429 Traffic System Interface Check
If a Garmin GTS 8XX Traffic system, L-3 Communications SKY497/SKY899 SkyWatch® sensor, or a
Honeywell (Bendix/King) KTA 810 TAS/KMH 820 IHAS has been connected to the GTN through
ARINC 429, the traffic interface should be verified as described in this section.
1. Go to the Traffic page on the GTN from the home page.
2. Verify that “NO DATA” is not displayed in yellow in the center of the Traffic page.
3. If the GTN is configured to control the traffic system, verify that the traffic system mode can be
changed from STBY to OPER.
4. Switch the traffic system mode to STBY, and then run the traffic self-test from the menu.
5. Verify that the traffic system executes a self-test and that a self-test pattern is displayed on the
GTN traffic display.
6. Restart the GTN in Configuration mode.
7. On the Traffic page in the External Systems page group, verify that there is data displayed in the
Altitude field.
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7.4.5.3 Stormscope® Interface Check
If an L-3 Communications WX-500 Stormscope has been connected to the GTN, the Stormscope interface
should be verified as described in this section.
1. Go to the Lightning page on the GTN.
2. Verify that “STORMSCOPE FAILED” is not displayed in yellow in the center of the Lightning
page.
3. Verify that the Stormscope mode can be changed from Strike to Cell, and vice versa.
7.4.5.4 TIS (Garmin GTX 33/330/335) Interface Check
If a Garmin GTX 33/330/335 transponder has been connected to the GTN as a TIS traffic source, the
traffic interface should be verified as described in this section.
1. Select the Traffic Map from the GTN home page.
2. Verify that “TIS FAIL” is not displayed in the upper-left corner under Traffic Status, and that “NO
DATA” (yellow) is not displayed over the ownship symbol.
3. On the upper-left corner of the Traffic Map page, verify that the status of the traffic system is
either “TIS Standby” or “TIS Operating/Unavailable” (i.e., “TAS” should not be displayed).
The following additional steps should only be completed if the GTN is controlling the traffic system.
1. Open the transponder circuit breaker and verify the Air Data fields have a red “X”.
2. If a squat switch (or airspeed switch) is connected to the GTX 3XX, ensure that it is in AIR mode.
3. Alternately, touch the Standby key and Operate key to change the mode of the traffic system. It
may take several seconds for the traffic system to change modes.
4. Verify that the mode of the traffic system can be changed.
7.4.5.5 GTX 345/345R Interface Check
When testing the GTX 345/345R, the aircraft must be located outside and have an unobstructed view of the
sky. If the GTX 345/345R is installed and connected to the GTN as the ADS-B In source, check the
operation as follows:
1. With the GTN unit running in Normal mode, and the transponder powered on, go to the home page
and press the System key.
2. Press the External LRUs key and make sure that the status for the GTX is a green checkmark.
3. Press the More Info key for the GTX and make sure that the GPS status and software versions are
reported.
4. Repeated the preceding steps for GTN #2.
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7.4.6 Weather Radar
Perform the appropriate interface check for the weather radar. No additional GTN configuration steps are
required for replacing a weather radar with an equivalent unit.
7.4.6.1 GWX 68/70/75 Weather Radar Interface Check
This section verifies that the interface between the GTN 7XX and the GWX 68/70/75 weather radar is
functional.
1. Start the GTN in Normal mode.
2. On the home page, touch the Weather key and then the Radar key.
3. Touch the Mode key and select Standby mode and wait for the warm-up to complete.
4. Touch the Mode key again and select Test mode.
5. Verify that the GWX 68/70/75 begins sweeping and the test pattern is shown.
6. If supported by the installation, verify that stabilization is on (“STAB On” is displayed in the
upper-right corner of the radar display).
7. Touch the Mode key, set the mode to Off.
8. Repeat steps 1 through 7 for the second GTN 7XX, if installed.
7.4.6.2 ARINC 708 Weather Radar Interface Check
This section verifies that the interface between the GTN 7XX and ARINC 708 weather radar is functional.
WARNING
Aircraft should be outdoors and personnel should not be in front of the weather radar
when it is radiating (i.e., when Weather or Ground mode is selected on the GTN).
1.
2.
3.
4.
5.
6.
Start the GTN in Normal mode. If there are dual GTN 7XXs, start both in Normal mode.
On each GTN, go to the home page, touch Weather and then Radar.
On one GTN, touch the Mode key and select Standby mode and wait for the warm-up to complete.
Touch the Mode key again and select Test mode.
Verify that the radar begins sweeping and the test pattern is shown.
If stabilization is supplied to the radar, turn the radar to Weather mode and turn stabilization On in
the weather menu. Verify that “STAB On” is displayed in the upper-right corner or the radar
display. If “STAB INOP” is displayed, verify that stabilization is being supplied to the weather
radar R/T.
7. Touch the Mode key to set the mode to Off.
NOTE
If only one GTN 7XX is installed, the following steps do not have to be carried out.
8. Repeat steps 1 through 7 for the second GTN 7XX.
9. On each GTN 7XX, touch the Mode key and select Standby mode and wait for the warm-up to
complete.
10. On each GTN 7XX, touch the Mode key again and select Test mode.
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11. On GTN #1, touch the Zoom Out key to increase the range of the radar display. Verify that the
range on GTN #1 changes and the range on GTN #2 does not change.
12. On GTN #2, touch the Zoom Out key to increase the range of the radar display – select a different
zoom level than GTN #1. Verify that the range on GTN #2 changes and the range on GTN #1 does
not change.
13. On each GTN 7XX, use the Mode key to set the mode to Off.
7.4.7 GDL 88
When testing the GDL 88, the aircraft must be located outside and have an unobstructed view of the sky. If
the GDL 88 is installed and connected to the GTN, perform the following steps. No additional
configuration steps are required when replacing the GDL 88 with an equivalent unit.
1. Start all GTNs in Configuration mode as described in Section 3.3.
2. Touch the External Systems key.
3. Touch the GDL 88 key.
4. Touch Diagnostics and then the GPS/SBAS Data key.
5. Verify that the GDL 88 is receiving valid position source data.
6. Verify that the status of the External PPS connection(s) is valid.
7.4.8 Fan Interface Check
The fan that is mounted to the GTN backplate should be checked after replacing the fan. With the GTN
unit running in Normal mode, and the fan powered on and running, go to the home page and touch the
Message Queue key. Ensure that the “COOLING FAN- the cooling fan has failed” message is not
displayed. Note that the fan may take a few minutes to power on if the unit is below normal operating
temperature.
7.4.9 Flight Stream 210/510 Interface Checks
7.4.9.1 Bluetooth Setup
When the Flight Stream 210/510 device is powered on, Pairing mode will not be enabled until the Connext
Setup page is opened on the GTN.
The default Flight Stream 210/510 Bluetooth name is “Flight Stream” followed by the three-digit model
number (i.e., “210” or “510”) and then the last four digits of the MAC address (e.g., Flight Stream 210
4000). A pop-up will appear on the GTN screen asking the pilot to confirm the new Bluetooth pairing.
Select Yes to finish pairing the device.
Bluetooth setup only needs to be run when pairing with a device for the first time. Once a connection is
established with a Bluetooth device, the Flight Stream 210/510 will automatically connect to the Bluetooth
device upon power-up. The Flight Stream may be connected to up to four Bluetooth devices
simultaneously. The Flight Stream 210/510 will also save up to 13 Bluetooth device pairings.
1. Enable Bluetooth connectivity on the PED. Once enabled, Flight Stream 210/510 will be viewable
in the list of available devices.
2. Select the Flight Stream 210/510 from the list of available Bluetooth devices on the PED.
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After pairing the Flight Stream 210/510 with the PED, make sure the device is communicating with the
GTN, GDL 88 (if installed), and GDL 69A (if installed). This test should be performed outside, away from
buildings and large obstructions. If any of the tests below are unsuccessful, refer to Section 6 for
troubleshooting information.
7.4.9.2 Flight Stream 210 Interface Checks:
GTN Interface Check
1. On the Garmin Pilot application, go to the Flight Plan page and create a flight plan.
2. Select the Connext icon at the top of the page.
3. Next select the option to send the flight plan to the GTN. If successful, a message will be available
on the GTN.
GDL 88 Interface Check (If installed)
1. Go to the Traffic page on the GTN.
2. Go to the Traffic page on the Garmin Pilot application.
3. On the GTN Traffic page, touch the Menu key.
4. Touch the Test key. If the Test key is unavailable, ADS-B Status must be turned off first.
5. Make sure the traffic targets are displayed on the PED.
GDL 69/69A Interface Check (If installed)
1. On the Garmin Pilot application, go to the Connext page.
2. Select SiriusXM under Status and make sure weather data is available.
7.4.9.3 Flight Stream 510 Interface Checks:
GTN Interface Check
1. On the Garmin Pilot application, go to the Flight Plan page and create a flight plan.
2. Select the Connext icon at the top of the page.
3. Next, select the option to send the flight plan to the GTN. If successful, a message will be available
on the GTN.
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7.5 Enabled Features
Refer to Section 3.3.4 for guidance on enabling features.
7.5.1 Terrain Configuration and Checks (For Units with Terrain Alerting/TAWS Only)
Reconfigure terrain settings per the configuration checkout log. The terrain configuration settings are
located under the GTN Options menu.
Figure 7-5 Audio Configuration Page
Figure 7-6 Terrain Configuration Page
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7.5.1.1 Terrain System Check
While on the ground, turn on the GTN following normal power-up procedures. Turn on the audio panel.
NOTE
A 3D GPS position fix is required to conduct the check.
1.
2.
3.
4.
Select the Terrain page from the Normal mode home page.
Touch the Menu key.
Touch the Test Terrain or Test TAWS key.
Wait until the Terrain Alerting/TAWS self-test completes (10-15 seconds) to hear the Terrain/
TAWS system status aural message.
 The aural message “Terrain System Test OK” or “TAWS System Test OK” will be annunciated
if the Terrain/TAWS system is functioning properly
 The aural message “Terrain System Failure” or “TAWS System Failure” will be annunciated if
the Terrain/TAWS system is NOT functioning properly. “Terrain Fail” or “TAWS FAIL” will
appear in amber on the screen
If no audio message is heard, then a fault exists within the audio system or associated wiring and the
Terrain/TAWS capability must be considered non-functional. Verify continuity of wiring from GTN to
audio panel as specified in GTN 6XX/7XX Part 23 AMC STC Installation Manual (P/N 190-01007-A3).
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8 RETURN TO SERVICE PROCEDURE
8.1 Maintenance Records
After conducting required return to service procedures in accordance with Table 7-1 and updating aircraft
records in accordance with this section and in compliance with 14 CFR 43.9 and 14 CFR 91.417, the
aircraft may be returned to service.
Record the following information in the appropriate aircraft maintenance logs:
 Software versions loaded during maintenance
 Part and serial numbers of any LRU replaced
 Any other applicable information related to the maintenance work performed on the aircraft
Verify that replacement LRUs’ software and/or FPGA versions match those in the configuration log from
Appendix A in the aircraft records.
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APPENDIX A
AIRCRAFT-SPECIFIC INFORMATION
Acrobat Reader 8.0 or later is necessary to view and fill out the form. You can download Acrobat Reader
by visiting www.adobe.com.
When updating software, it is unnecessary to fill out a new configuration log. The Current Revision
Description identifies all pages with changes. Fill out the applicable pages and append them to the back of
the existing configuration log.
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GENERAL INFORMATION
Date:
/
/
By:
AIRCRAFT:
AIRCRAFT MAKE:
AIRCRAFT MODEL:
AIRCRAFT SERIAL #:
AIRCRAFT REG. #:
GTN #1:
Unit P/N:
Mod Level:
Unit Model:
Serial #:
GPS Antenna P/N #:
GPS Antenna Model:
GTN #2: 
[N/A]
Unit P/N:
Mod Level:
Unit Model:
Serial #:
GPS Antenna P/N #:
GPS Antenna Model:
GMA 35: 
[N/A]
Unit P/N:
Mod Level:
Unit Model:
Serial #:
FLIGHT STREAM:  [N/A]
Unit P/N:
Mod Level:
Unit Model:
Serial #:
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GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1
SYSTEM INFORMATION
GTN SOFTWARE VERSIONS
Main Board
Software:
Boot Code:
FPGA:
Touch Controller Board
Software:
Boot Code:
GPS/WAAS Board
Software:
NAV Board 
[N/A]
Software:
COM Board 
Boot Code:
FPGA:
Boot Code:
FPGA:
[N/A]
Software:
GTN SETUP MENU
ARINC 429 CONFIGURATION
In 1: 
High 
Low
Out 1: 
High 
Low
In 2: 
High 
Low
Out 2: 
High 
Low
In 3: 
High 
Low
Out 3: 
High 
Low
In 4: 
High 
Low
SDI: 
Common

LNAV 1 
LNAV 2
RS-232 CONFIGURATION
In 1:
Out 1:
In 2:
Out 2:
In 3:
Out 3:
In 4:
Out 4:
In 5:
Out 5:
In 6:
Out 6:
MORE RS-232 CONFIGURATION
Forward ALT to GTX
Enabled Disabled
This setting is only available if a transponder is configured on a RS-232 port.
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GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 - CONTINUED
GTN SETUP MENU - CONTINUED
HSDB (ETHERNET) CONFIGURATION
Port 1: 
Connected

Not Connected
Port 3: 
Connected

Not Connected
Port 2: 
Connected

Not Connected
Port 4: 
Connected

Not Connected
INTERFACED EQUIPMENT CONFIGURATION
Cross-Side Navigator:

Present Not Present
GDU #1:

Present Not Present
Type:
GDU #2:

Present Not Present
Type:
GDU #3:

Present Not Present
Type:
GDL 69/69A:

Present Not Present
Type:
GDL 88/88D:

Present Not Present
Type:
ADS-B In Source:

Present Not Present
Type:
Transponder #1:

Present Not Present Type:
Transponder #2:
 Present Not Present
GSR 56:

Present Not Present
GWX:

Present Not Present
GDL 88
Type:
Type:
MAIN INDICATOR (ANALOG) CONFIGURATION
CDI Key: 
Enabled 
Disabled 
N/A
Selected Course for VLOC: 
Allow 
Ignore 
N/A
Selected Course for GPS:
V-Flag State: 
Normal 
Declutter

Allow 
Ignore
LIGHTING CONFIGURATION
(IF ENHANCED LIGHTING IS DISABLED)
Lighting Configuration:
 [N/A]
Display Source: 
Photocell 
Lighting Bus 1 Keys Source: 
Photocell 
Lighting Bus 1 
Lighting Bus 2
Display Minimum Level:
%
Display Minimum Level:
%
Configure Photocell:[N/A]
Response Time:
sec Slope:
Offset:
Photocell Override
Key Backlight Cutoff:
Configure Lighting Bus:
%
Photocell Transition:
[N/A]
Lighting Bus 1:

14 VDC 
28 VDC 
5 VDC 
5VAC
Response Time:
sec Slope:
Offset:
Lighting Bus 2: 
[N/A] 
14 VDC 
28 VDC 
5 VDC 
5VAC
Response Time:
190-01007-A1
Rev. 11
sec Slope:
Offset:
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-4
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 - CONTINUED
GTN SETUP MENU - CONTINUED
ENHANCED LIGHTING CONFIGURATION
(IF ENABLED ON MAIN SYSTEM CONFIGURATION PAGE)
ENHANCED LIGHTING:[N/A]
SOURCE SETTINGS
Display Source: 
Photocell 
Lighting Bus 1 Keys Source: 
Photocell 
Lighting Bus 1 
Lighting Bus 2
Photocell: Response Time:
sec
Lighting Bus 1: 
[N/A] Input Type: 
14 VDC 
28 VDC 
5 VDC 
5VAC Response Time:
sec
Lighting Bus 2: 
[N/A] Input Type: 
14 VDC 
28 VDC 
5 VDC 
5VAC Response Time:
sec
DAY MODE OPERATION
Photocell Transition:
%
Key Backlight Cutoff:
%
%
Maximum Level:
%
DISPLAY
Minimum Level:
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
KEYS
Minimum Level:
%
Maximum Level:
%
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
NIGHT MODE OPERATION 
[N/A]
Photocell Transition:
%
Key Backlight Cutoff:
%
%
Maximum Level:
%
DISPLAY
Minimum Level:
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
KEYS
Minimum Level:
%
Maximum Level:
%
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-5
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 - CONTINUED
GTN SETUP MENU - CONTINUED
AUDIO CONFIGURATION
Alert Volume Level:
%
VOICE COMMAND CONFIGURATION
Voice Commands: 
Off On
Mute Commands: Off
“Say…” Commands: 
Off On
TRAFFIC CONFIGURATION
Traffic Intruder Symbol Color: 
Cyan 
White
GTN Control of Traffic System: 
Yes 
No
MAIN SYSTEM CONFIGURATION
Airframe Type: Fixed Wing
Heading Source Input: 
Connected 
Not Connected
Air/Ground Threshold:
Radio Altimeter Input: 
Connected 
Not Connected
( Radio Altimeter not approved under this STC)
KT
Air/Ground Discrete: 
Active for Airborne
Altitude Source Input: 
Connected 
Not Connected
Enhanced Lighting Mode: 
Enabled 
Disabled


Active for Ground
GPS Antenna Height Above Ground:________FT
Fuel Type: 
AV Gas 
Jet A 
Jet B
Pilot Position: 
Right 
Left
Synchro Heading Input: 
Connected 
Not Connected Crossfill Status Alert: 
Enabled 
Disabled
GPS Select: 
Auto 
Prompt
(Crossfill Status Alert not approved under this STC)
Database SYNC: Pilot Control Enabled Disabled System ID: GTN 1 
GTN 2
Airspace Labels: Enabled Disabled
Blackout Mode: Enabled
Disabled
Checklist Page Title: Checklist 
Task List
COM CONFIGURATION (GTN 635/650/750 ONLY)
COM Radio: 
Enabled 
Disabled
RX Squelch Mode: Basic
COM RX Squelch:
Sidetone Source: External Internal
MIC 1 Gain:
%
dB
Sidetone Volume:
Advanced
Spacing
Squelch
dB
Sidetone Pilot Control: Enabled Disabled
VOR/LOC/GS CONFIGURATION (GTN 650/750 ONLY)
NAV Radio:

Enabled

Disabled
DME Mode: 
Directed Freq. 1 
Directed Freq. 2
ARINC 429 TX Speed:

High

Low
DME Channel Mode:
ARINC 429 SDI:

Common 
VOR/ILS 1 
VOR/ILS 2
ARINC 453/708 CONFIGURATION
Port 1: External Weather Radar: 
Off 
On
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-6
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 - CONTINUED
GTN SETUP MENU - CONTINUED
DISCRETES CONFIGURATION
J1001-16:
J1001-52: VLOC Annunciate
J1001-36:
J1001-53:
J1001-37:
J1001-54:
J1001-38:
J1001-55:
J1001-39:
J1001-56: ILS/GPS Approach Annunciate
J1002-01: Demo Mode Select
J1001-57:
J1002-10:
J1001-71:
J1002-11:
J1001-72:
J1005-33*: Synchro Valid - Low
J1001-73:
J1005-53*:
J1001-74:
J1005-54*: Synchro Valid - High
J1001-75:
J1001-14:
J1002-76:
J1001-15: GPS Annunciate
J1002-03:
J1001-33:
J1002-12:
J1001-34:
J1005-13*:
J1001-35:
J1005-34*:
*Available only on GTN 725 and GTN 750 units.
NAVIGATION FEATURES
Mark on Target:

Enabled 
Disabled (Mark on Target not approved under this STC)
RF Procedure Legs: 
Enabled

Disabled
OWNSHIP CONFIGURATION
Ownship Configuration: __________________________________________________
Selection of ownship color magenta is not covered under this STC.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-7
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 - CONTINUED
GTN OPTIONS MENU
TERRAIN CONFIGURATION
Terrain Mode: 
Terrain Proximity 
TAWS A 
TAWS B ‰ Terrain Alerting
TAWS Audio Clips
GSD Caution: “Glideslope”
RLC Caution: 
“Wire Ahead” x2
NCR Caution: 
“Don’t Sink”

“Caution Wire” x2
ITI Caution:

“Too Low Terrain”
ECR Caution: “Terrain, Terrain”

“Terrain Ahead” x2

“Caution Terrain” x2
EDR Caution: “Sink Rate”
RTC Caution:

“Terrain Ahead” x2

“Caution Terrain” x2
FIT Flap Caution: “Too Low Flaps”
IOI Warning:

“Obstacle Ahead Pull Up” x2

“Obstacle” x2 “Pull Up” x2
FIT Gear Caution: “Too Low Gear”
ILI Warning:

“Wire Ahead Pull Up” x2

“Wire” x2 “Pull Up” x2
PDA Caution: “Too Low Terrain”
RLC Warning: 
“Wire Ahead Pull Up” x2

“Wire” x2 “Pull Up” x2
FIT Speed Caution: “Too Low Terrain”
ROC Warning: 
“Obstacle Ahead Pull Up” x2

“Obstacle” x2 “Pull Up” x2
FIT Takeoff Caution: “Too Low Terrain”
IOI Caution:
ITI Warning:

“Obstacle Ahead” x2

“Terrain” x2 “Pull Up” x2
RTC Warning: 
“Terrain Ahead Pull Up” x2

“Caution Obstacle” x2
ROC Caution:
ILI Caution:

“Terrain Ahead Pull Up” x2

“Obstacle Ahead” x2

“Terrain” x2 “Pull Up” x2

“Caution Obstacle” x2
ECR Warning: “Tone Tone Pull Up”

“Wire Ahead” x2
EDR Warning: “Tone Tone Pull Up”

“Caution Wire” x2
500 FT:
“Five Hundred”
Terrain Alert Settings
Runway Surface: 
Any

Hard Only

Hard/Soft

Water
Minimum Runway Length:
FT
Approach Speed: (TAWS A Only)
[N/A]
KT
MAX Flap Extension Speed: (TAWS A Only)
[N/A]
KT
MAX Gear Extension Speed: (TAWS A Only)

[N/A]
KT
Flap Position Discrete: (TAWS A Only)
 [N/A] 
Active for Landing 
Active for Non-Landing
Landing Gear Position Discrete: (TAWS A Only)  [N/A] 
Active for Landing 
Active for Non-Landing
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-8
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 – CONTINUED
GTN OPTIONS MENU - CONTINUED
CHARTS
Charts Configured:

None

FliteCharts

ChartView
COM TRANSMIT POWER
Com Transmit Power:

Normal

16W

N/A
WEATHER RADAR
Digital Radar:

N/A 
Enabled
Turbulence Detection:

N/A 
Enabled
N/A 
Enabled
Ground Clutter Suppression:  
SEARCH AND RESCUE
Search and Rescue:

N/A 
Enabled
Parallel Track:

N/A 
Enabled
Sector Search:

N/A 
Enabled
Expanding Square:

N/A 
Enabled
Orbit:

N/A 
Enabled
190-01007-A1
Rev. 11
SAR PATTERNS
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-9
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #1 – CONTINUED
NOTES
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-10
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2
SYSTEM INFORMATION
GTN SOFTWARE VERSIONS
Main Board
Software:
Boot Code:
FPGA:
Touch Controller Board
Software:
Boot Code:
GPS/WAAS Board
Software:
NAV Board 
[N/A]
Software:
COM Board 
Boot Code:
FPGA:
Boot Code:
FPGA:
[N/A]
Software:
GTN SETUP MENU
ARINC 429 CONFIGURATION
In 1: 
High 
Low
Out 1: 
High 
Low
In 2: 
High 
Low
Out 2: 
High 
Low
In 3: 
High 
Low
Out 3: 
High 
Low
In 4: 
High 
Low
SDI: 
Common 
LNAV 1 
LNAV 2
RS-232 CONFIGURATION
In 1:
Out 1:
In 2:
Out 2:
In 3:
Out 3:
In 4:
Out 4:
In 5:
Out 5:
In 6:
Out 6:
MORE RS-232 CONFIGURATION
Forward ALT to GTX

LNAV 1 
LNAV 2
This setting is only available if a transponder is configured on a RS-232 port.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-11
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 - CONTINUED
GTN SETUP MENU - CONTINUED
HSDB (ETHERNET) CONFIGURATION
Port 1: 
Connected

Not Connected
Port 3: 
Connected

Not Connected
Port 2: 
Connected

Not Connected
Port 4: 
Connected

Not Connected
INTERFACED EQUIPMENT CONFIGURATION
Cross-Side Navigator:

Present Not Present
GDU #1:

Present Not Present Type:
GDU #2:

Present Not Present Type:
GDU #3:

Present Not Present Type:
GDL 69/69A:

Present Not Present Type:
GDL 88/88D:

Present Not Present Type:
ADS-B In Source:

Present Not Present Type:
Transponder #1:

Present Not Present Type:
Transponder #2:

Present Not Present Type:
GSR 56:

Present Not Present
GWX:
 Present Not Present Type:
GDL 88
MAIN INDICATOR (ANALOG) CONFIGURATION
CDI Key: 
Enabled 
Disabled 
N/A
Selected Course for VLOC: 
Allow 
Ignore 
N/A
Selected Course for GPS:
V-Flag State: 
Normal 
Declutter

Allow 
Ignore
LIGHTING CONFIGURATION
(IF ENHANCED LIGHTING IS DISABLED)
Lighting Configuration:
 [N/A]
Display Source: 
Photocell 
Lighting Bus 1 Keys Source: 
Photocell 
Lighting Bus 1 
Lighting Bus 2
Display Minimum Level:
%
Display Minimum Level:
%
Configure Photocell:[N/A]
Response Time:
sec Slope:
Offset:
Photocell Override
Key Backlight Cutoff:
Configure Lighting Bus:
%
Photocell Transition:
[N/A]
Lighting Bus 1:

14 VDC 
28 VDC 
5 VDC 
5VAC
Response Time:
sec Slope:
Offset:
Lighting Bus 2: 
[N/A] 
14 VDC 
28 VDC 
5 VDC 
5VAC
Response Time:
190-01007-A1
Rev. 11
sec Slope:
Offset:
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-12
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 - CONTINUED
GTN SETUP MENU - CONTINUED
ENHANCED LIGHTING CONFIGURATION
(IF ENABLED ON MAIN SYSTEM CONFIGURATION PAGE)
ENHANCED LIGHTING:[N/A]
SOURCE SETTINGS
Display Source: 
Photocell 
Lighting Bus 1 Keys Source: 
Photocell 
Lighting Bus 1 
Lighting Bus 2
Photocell: Response Time:
sec
Lighting Bus 1: 
[N/A] Input Type: 
14 VDC 
28 VDC 
5 VDC 
5VAC Response Time:
sec
Lighting Bus 2: 
[N/A] Input Type: 
14 VDC 
28 VDC 
5 VDC 
5VAC Response Time:
sec
DAY MODE OPERATION
Photocell Transition:
%
Key Backlight Cutoff:
%
%
Maximum Level:
%
DISPLAY
Minimum Level:
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
KEYS
Minimum Level:
%
Maximum Level:
%
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
NIGHT MODE OPERATION 
[N/A]
Photocell Transition:
%
Key Backlight Cutoff:
%
%
Maximum Level:
%
DISPLAY
Minimum Level:
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
KEYS
Minimum Level:
%
Maximum Level:
%
Configure Curve
Vertex 1: Input Level
% Output Level
% Vertex 3: Input Level
% Output Level
%
Vertex 2: Input Level
% Output Level
% Vertex 4: Input Level
% Output Level
%
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-13
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 - CONTINUED
GTN SETUP MENU - CONTINUED
AUDIO CONFIGURATION
Alert Volume Level:
%
VOICE COMMAND CONFIGURATION
Voice Commands: 
Off On
“Say…” Commands: 
Off On
Mute Commands: 
Off
TRAFFIC CONFIGURATION
Traffic Intruder Symbol Color: 
Cyan 
White
GTN Control of Traffic System: 
Yes 
No
MAIN SYSTEM CONFIGURATION
Airframe Type: Fixed Wing
Heading Source Input: 
Connected 
Not Connected
Air/Ground Threshold:
Radio Altimeter Input: 
Connected 
Not Connected
( Radio Altimeter not approved under this STC)
KT
Air/Ground Discrete: 
Active for Airborne
Altitude Source Input: 
Connected 
Not Connected
Enhanced Lighting Mode: Enabled Disabled
Active for Ground
GPS Antenna Height Above Ground:________FT
Fuel Type: 
AV Gas 
Jet A 
Jet B
Pilot Position: 
Right 
Left
Synchro Heading Input: 
Connected 
Not Connected Crossfill Status Alert: 
Enabled 
Disabled
GPS Select: 
Auto 
Prompt
(Crossfill Status Alert not approved under this STC)
Database SYNC: Pilot Control Enabled Disabled System ID: GTN 1 GTN 2
Airspace Labels: Enabled Disabled Blackout Mode: Enabled Disabled
Checklist Page Title: Checklist 
Task List
COM CONFIGURATION (GTN 635/650/750 ONLY)
COM Radio: 
Enabled 
Disabled
RX Squelch Mode: Basic
COM RX Squelch:
Sidetone Source: External Internal
MIC 1 Gain:
%
dB
Sidetone Volume:
Advanced
Spacing
Squelch
dB
Sidetone Pilot Control: Enabled Disabled
VOR/LOC/GS CONFIGURATION (GTN 650/750 ONLY)
NAV Radio:

Enabled 
Disabled
DME Mode: 
Directed Freq. 1 
Directed Freq. 2
ARINC 429 TX Speed:

High
DME Channel Mode:
ARINC 429 SDI:

Common 
VOR/ILS 1 
VOR/ILS 2

Low
ARINC 453/708 CONFIGURATION
Port 1: External Weather Radar: 
Off 
On
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-14
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 - CONTINUED
GTN SETUP MENU - CONTINUED
DISCRETES CONFIGURATION
J1001-16:
J1001-52: VLOC Annunciate
J1001-36:
J1001-53:
J1001-37:
J1001-54:
J1001-38:
J1001-55:
J1001-39:
J1001-56: ILS/GPS Approach Annunciate
J1002-01: Demo Mode Select
J1001-57:
J1002-10:
J1001-71:
J1002-11:
J1001-72:
J1005-33*: Synchro Valid - Low
J1001-73:
J1005-53*: Do Not Use
J1001-74:
J1005-54*: Synchro Valid - High
J1001-75:
J1001-14:
J1002-76:
J1001-15: GPS Annunciate
J1002-03:
J1001-33:
J1002-12:
J1001-34:
J1005-13*:
J1001-35:
J1005-34*:
*Available only on GTN 725 and GTN 750 units.
NAVIGATION FEATURES
Mark on Target:

Enabled 
Disabled (Mark on Target not approved under this STC)
RF Procedure Legs: 
Enabled 
Disabled
OWNSHIP CONFIGURATION
Ownship Configuration: __________________________________________________
Selection of ownship color magenta is not covered under this STC.
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-15
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 - CONTINUED
GTN OPTIONS MENU
TERRAIN CONFIGURATION
Terrain Mode: 
Terrain Proximity 
TAWS A 
TAWS B ‰ Terrain Alerting
TAWS Audio Clips
GSD Caution: “Glideslope”
RLC Caution: 
“Wire Ahead” x2
NCR Caution: 
“Don’t Sink”

“Caution Wire” x2
ITI Caution:

“Too Low Terrain”
ECR Caution: “Terrain, Terrain”

“Terrain Ahead” x2

“Caution Terrain” x2
EDR Caution: “Sink Rate”
RTC Caution:

“Terrain Ahead” x2

“Caution Terrain” x2
FIT Flap Caution: “Too Low Flaps”
IOI Warning:

“Obstacle Ahead Pull Up” x2

“Obstacle” x2 “Pull Up” x2
FIT Gear Caution: “Too Low Gear”
ILI Warning:

“Wire Ahead Pull Up” x2

“Wire” x2 “Pull Up” x2
PDA Caution: “Too Low Terrain”
RLC Warning: 
“Wire Ahead Pull Up” x2

“Wire” x2 “Pull Up” x2
FIT Speed Caution: “Too Low Terrain”
ROC Warning: 
“Obstacle Ahead Pull Up” x2

“Obstacle” x2 “Pull Up” x2
FIT Takeoff Caution: “Too Low Terrain”
IOI Caution:
ITI Warning:

“Obstacle Ahead” x2

“Terrain” x2 “Pull Up” x2
RTC Warning: 
“Terrain Ahead Pull Up” x2

“Caution Obstacle” x2
ROC Caution:
ILI Caution:

“Terrain Ahead Pull Up” x2

“Obstacle Ahead” x2

“Terrain” x2 “Pull Up” x2

“Caution Obstacle” x2
ECR Warning: “Tone Tone Pull Up”

“Wire Ahead” x2
EDR Warning: “Tone Tone Pull Up”

“Caution Wire” x2
500 FT:
“Five Hundred”
Terrain Alerting Settings
Runway Surface: 
Any

Hard Only

Hard/Soft

Water
Minimum Runway Length:
FT
Approach Speed: (TAWS A Only)
[N/A]
KT
MAX Flap Extension Speed: (TAWS A Only)
[N/A]
KT
MAX Gear Extension Speed: (TAWS A Only)

[N/A]
KT
Flap Position Discrete: (TAWS A Only)
 [N/A] 
Active for Landing 
Active for Non-Landing
Landing Gear Position Discrete: (TAWS A Only)  [N/A] 
Active for Landing 
Active for Non-Landing
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-16
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 – CONTINUED
GTN OPTIONS MENU - CONTINUED
CHARTS
Charts Configured:

None

FliteCharts

ChartView
COM TRANSMIT POWER
Com Transmit Power:

Normal

16W

N/A
WEATHER RADAR
Digital Radar:

N/A 
Enabled
Turbulence Detection:

N/A 
Enabled
N/A 
Enabled
Ground Clutter Suppression:  
SEARCH AND RESCUE
Search and Rescue:

N/A 
Enabled
Parallel Track:

N/A 
Enabled
Sector Search:

N/A 
Enabled
Expanding Square:

N/A 
Enabled
Orbit:

N/A 
Enabled
190-01007-A1
Rev. 11
SAR PATTERNS
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-17
GTN 6XX/7XX PART 23 CONFIGURATION LOG – GTN #2 – CONTINUED
NOTES
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-18
GTN 6XX/7XX PART 23 CONFIGURATION LOG
GMA 35 AUDIO PANEL CONFIGURATION  [N/A] Software Version:
AUDIO PANEL CONFIGURATION
INTERCOM
Mute PASS to CREW intercom during alerts
Mute PASS to CREW intercom during selected audio
Passengers hear selected audio
Receiver 5 is passenger

True 
False

True 
False

True 
False

True 
False
PASSENGER ADDRESS
Disable PA functionality

True 
False
MUSIC
Mute PASS music during intercom

True 
False
ALERTS
Passengers hear alerts

True 
False
SECONDARY RADIOS
Mute secondary radios on primary radio reception

True 
False
SIDETONE
Audio Processor generates COM1 internal sidetone
Audio Processor generates COM2 internal sidetone
Audio Processor generates COM3 internal sidetone

True 
False

True 
False

True 
False
COM 1/2 CONNECTIONS
COM 1 is connected as COM2

True 
False
SPEAKER
Ambient Noise Mic On

True 
False
HEADSET
Ambient Noise Mic On

True 
False
INPUT VOLUME
Alert 1 input audio volume
Alert 2 input audio volume
Alert 3 input audio volume
Alert 4 input audio volume
Failsafe Warn input audio volume
Marker volume
dB
dB
dB
dB
dB
dB
Music 1
Music 2
Telephone
Bluetooth Audio
Bluetooth Telephone
Audio Clips
dB
dB
dB
dB
dB
dB
SPEAKER VOLUME
Pilot PA
dB
Crew Audio
dB
Copilot PA
dB
Alert Audio Sum
dB
ALERT1
ALERT2
ALERT3
ALERT4
dB
dB
dB
dB
SQUELCH THRESHOLD
COM1
COM2
COM3
dB
dB
dB
NAV1
NAV2
RCVR3
dB
dB
dB
RCVR4
RCVR5
WARN1
dB
dB
dB
OTHER
Marker Beacon high sense threshold
Marker Beacon low sense threshold
Marker external lamp lighting offset
dB
dB
dB
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-19
GTN 6XX/7XX PART 23 CONFIGURATION LOG
GMA 35 AUDIO PANEL CONFIGURATION – CONTINUED
AUDIO PANEL DISCRETES
J3501-16:
J3502-14:
J3502-30:
AUDIO PANEL CONNECTED RADIOS
COM 2:

Present

Not Present
COM 3:

Present

Not Present
NAV 1:

Present

Not Present
NAV 2:

Present

Not Present
RCVR 3:

Present

Not Present
Type:
RCVR 4:

Present

Not Present
Type:
RCVR 5:

Present

Not Present
Type:
TEL:

Present

Not Present
MUSIC 1:

Present

Not Present
MUSIC 2:

Present

Not Present
MARKER BEACON:

Present

Not Present
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-20
Wire Routing
Single Engine
The following diagram depicts approximate location of all LRUs and antenna(s) along with the wire routing for the
GTN 6XX/7XX, GMA 35, and Flight Stream 210 throughout the aircraft structure for a single-engine aircraft.
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-21
Twin Engine
The following diagram depicts approximate location of all LRUs and antenna(s) along with the wire routing for the
GTN 6XX/7XX, GMA 35, and Flight Stream 210 throughout the aircraft structure for a twin-engine aircraft.
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-22
Aircraft Wiring Diagrams
Attach the aircraft wiring diagrams showing the equipment installed by this STC or a markup of the interconnect
diagrams from the STC installation manual detailing which equipment was installed and how it was connected.
NOTE
Electrical loads for equipment installed by this STC are listed in GTN 6XX/7XX AML STC
Installation Manual.
Check all that apply and add a brief description of the
location.
SPLITTER
Included in Installation: Yes No
Description of Location:
DIPLEXER
Included in Installation: Yes No
Description of Location:
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-23
Equipment Interfaced to the GTN 6XX/7XX
The purpose of the GTN Interfaced Equipment Lists (GTN #1 and GTN #2 (if applicable)) is to document the
equipment that is interfaced to the GTN(s). Use the following guidance when filling out these tables:

Installed?: Check “Yes” if the equipment is installed in the aircraft and interfaced to the GTN. If the equipment
is not installed in the aircraft, check “No.” If the equipment is installed in the aircraft but not interfaced to the
GTN, check “No.”

Model(s): Enter the model number or numbers of the equipment that is interfaced to the GTN.

Interface(s): Enter the type of interface used to connect to the GTN.

GTN Port Numbers: When applicable, enter the GTN port number or numbers used for the interface. This
column is generally applicable only to serial ports such as RS-232 and ARINC 429.

Covered by GTN STC Installation Manual?: Refer to Section 3. Check “Yes” if the equipment is listed in
Appendix C of GTN 6XX/7XX AML STC Installation Manual. Check “No” if the equipment is not listed in
Appendix C of GTN 6XX/7XX AML STC Installation Manual.
NOTE
This information is optional and is not required to be completed or maintained with the aircraft
records.
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-24
GTN #1 Interfaced Equipment List
Equipment Type
COM Antenna
Installed: 
Yes 
No
NAV Antenna
Installed: 
Yes 
No
AUDIO PANEL
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
AIR DATA COMPUTER(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
ALTITUDE SERIALIZER OR FUEL/AIR DATA
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
AUTOPILOT
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-25
GTN #1 Interfaced Equipment List - CONTINUED
AUTOPILOT ROLL STEERING CONVERTER
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
EFIS DISPLAY(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
EHSI(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
GSR 56
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-26
GTN #1 Interfaced Equipment List - CONTINUED
GDL 88
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
IRU/AHRS UNIT(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TRANSPONDER(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
NAV INDICATORS
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-27
GTN #1 Interfaced Equipment List - CONTINUED
TRAFFIC SOURCE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TAWS (EXTERNAL TO GTN)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER SOURCE: WX-500 STORMSCOPE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER SOURCE: GDL 69/69A
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-28
GTN #1 Interfaced Equipment List - CONTINUED
DME
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
CDI/HSI SOURCE SELECTION ANNUNCIATOR
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TAWS ANNUNCIATOR PANEL
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
MULTIFUNCTION DISPLAY(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-29
GTN #1 Interfaced Equipment List - CONTINUED
INTERFACE ADAPTER(S) (E.G., GAD 42)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
SYNCHRO HEADING SOURCE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER RADAR
Installed: Yes No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes No
If a second GTN is not installed in the aircraft, check this box and do not fill out the following table.

[GTN #2 Not Installed]
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-30
GTN #2 Interfaced Equipment
COM Antenna
Installed: 
Yes 
No
Equipment Type
NAV Antenna
Installed: 
Yes 
No
AUDIO PANEL
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
AIR DATA COMPUTER(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
ALTITUDE SERIALIZER OR FUEL/AIR DATA
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
AUTOPILOT
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-31
GTN #2 Interfaced Equipment - CONTINUED
AUTOPILOT ROLL STEERING CONVERTER
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
EFIS DISPLAY(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
EHSI(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
GSR 56
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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Page A-32
GTN #2 Interfaced Equipment - CONTINUED
GDL 88
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
IRU/AHRS UNIT(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TRANSPONDER(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
NAV INDICATORS
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
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Page A-33
GTN #2 Interfaced Equipment - CONTINUED
TRAFFIC SOURCE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TAWS (EXTERNAL TO GTN)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER SOURCE: WX-500 STORMSCOPE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER SOURCE: GDL 69/69A
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-34
GTN #2 Interfaced Equipment - CONTINUED
DME
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
CDI/HSI SOURCE SELECTION ANNUNCIATOR
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
TAWS ANNUNCIATOR PANEL
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
MULTIFUNCTION DISPLAY(S)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-35
GTN #2 Interfaced Equipment - CONTINUED
INTERFACE ADAPTER(S) (E.G., GAD 42)
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
SYNCHRO HEADING SOURCE
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
WEATHER RADAR
Installed: 
Yes 
No
Model(s):
Interface(s) (Analog, RS-232, ARINC 429, etc.):
GTN Port Number(s) (if applicable):
Covered by GTN STC Installation Manual? 
Yes 
No
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-36
Equipment Interfaced to the GMA 35
The purpose of the GMA 35 Interfaced Equipment List is to document the equipment that is interfaced to the GTN(s).
Use the following guidance when filling out these tables:

Installed?: Check “Yes” if the equipment is installed in the aircraft and interfaced to the GTN. If the equipment
is not installed in the aircraft, check “No.” If the equipment is installed in the aircraft but not interfaced to the
GTN, check “No.”

Model(s): Enter the model number or numbers of the equipment that is interfaced to the GTN.

Interface(s): Enter the type of interface used to connect to the GTN.
If a GMA 35 audio panel is not installed in the aircraft, check this box and do not fill out the following table.

[GMA 35 Not Installed]
NOTE
This information is optional and is not required to be completed or maintained with the aircraft
records.
COM RADIO #1
Equipment Type
Installed: 
Yes 
No
Model(s):
COM RADIO #2
Installed: 
Yes 
No
Model(s):
COM RADIO #3
Installed: 
Yes 
No
Model(s):
NAV RADIO #1
Installed: 
Yes 
No
Model(s):
NAV RADIO #2
Installed: 
Yes 
No
Model(s):
NAV RADIO #3
Installed: 
Yes 
No
Model(s):
NAV RADIO #4
Installed: 
Yes 
No
Model(s):
Marker Beacon Antenna
Installed: 
Yes 
No
190-01007-A1
Rev. 11
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Page A-37
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