Garmin | GTN™ 725 | Garmin GTN™ 725 Airplane Flight Manual Supplement, Dual Garmin GTN 725 Installation, ATR 42

Garmin GTN™ 725 Airplane Flight Manual Supplement, Dual Garmin GTN 725 Installation, ATR 42
© Copyright 2016
Garmin Ltd. 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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and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and
to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of
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Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: 913-397-8200
www.garmin.com
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190-01616-03 Rev. 2
Garmin International, Inc
Log of Revisions
FAA Approved Airplane Flight Manual Supplement for
Dual Garmin GTN 725 Installation in ATR – GIE Avions de Transport Régional
ATR 42.
REV
NO.
PAGE NO(S)
DESCRIPTION
DATE OF
APPROVAL
FAA APPROVED
1
ALL
Original Issue
02/25/2016
02/25/2016
2
ALL
Update to Main system software
version. Revised GPS equipment
approval. Revised GPS limitations.
Added Normal Procedures items.
See Cover
See Cover
190-01616-03 Rev. 2
FAA APPROVED
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FAA APPROVED
Table of Contents
Section 1.
General .................................................................................................... 7
USE OF THE SUPPLEMENT ................................................................................................................... 7
Garmin GTN 725 GNSS Navigation system Equipment approvals .................................................... 8
ABBREVIATIONS AND TERMINOLOGY .............................................................................................. 12
Section 2.
Limitations ............................................................................................ 15
GTN 725 GNSS (GPS/SBAS) Navigation system Limitations ........................................................... 15
Section 3.
Normal Procedures .............................................................................. 19
GTN 725 Unit Power Up and Database validation .............................................................................. 19
Glove Qualification Procedure ............................................................................................................. 19
Flight Director / Autopilot Normal Operating Procedures................................................................. 20
EFIS Display Normal Procedures ........................................................................................................ 20
Section 4.
Emergency Procedures ....................................................................... 27
Section 5.
Procedures Following Failures ........................................................... 29
Loss of GPS/SBAS Navigation Data .................................................................................................... 29
GPS Approach Downgrade .................................................................................................................. 30
Heading Data Source Failure ............................................................................................................... 30
Pressure Altitude Data Source Failure ................................................................................................ 30
Section 6.
Performances ....................................................................................... 31
Section 7.
Appendices and Supplements ............................................................ 33
Section 8.
System Description .............................................................................. 35
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190-01616-03 Rev. 2
FAA APPROVED
Section 1. General
The information in this supplement is FAA-approved material and must be attached to the Pilot’s Operating
Handbook and FAA Approved Airplane Flight Manual (POH/AFM) when the airplane has been modified by
installation of the Garmin Dual GTN 725 system in accordance with Garmin International, Inc. approved
data.
The information in this supplement supersedes or adds to the basic POH/AFM only as set forth below.
Users of the manual are advised to always refer to the supplement for possibly superseding information
and placarding applicable to operation of the airplane.
USE OF THE SUPPLEMENT
The following definitions apply to WARNINGS, CAUTIONS and NOTES found throughout the supplement:
WARNING
Operating procedures, techniques, etc., which may result in personal injury or loss of life if not
carefully followed.
CAUTION
Operating procedures, techniques, etc., which may result in damage to equipment if not
carefully followed.
NOTE
Operating procedures, techniques, etc., which is considered essential to emphasize.
190-01616-03 Rev. 2
FAA APPROVED
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Garmin GTN 725 GNSS Navigation system Equipment approvals
The long-range navigation system installed in this airplane consists of dual, independent GNSS long-range
navigation units with Satellite Based Augmentation System (SBAS). The system is comprised of two (2)
TSO-C146c / ETSO-C146 Class 3 GTN 725 navigation units, two (2) Garmin GA 36, antennas, GPS
software version 5.0 or later approved version in each GTN 725, and Main software 5.13 or later approved
version in each GTN 725.
The Garmin GTN 725 GNSS navigation systems as installed in this airplane complies with the requirements
of AC 20-138C and is approved for navigation using GPS and GPS/SBAS (within the coverage of a Satellite
Based Augmentation System signals complying with ICAO Annex 10) for IFR en-route, terminal area, and
non-precision approach.
The Garmin GTN 725 GNSS navigation system as installed in this airplane complies with the equipment,
performance, and functional requirements to conduct RNAV and RNP operations in accordance with the
following table:
Navigation
Specification
RNAV 10
RNP 10
Oceanic and
Remote
Areas of
Operation
(Class II
Navigation).
Operational
Requirements/
Authorization
GNSS FDE
availability must be
verified prior to flight.
Maximum predicted
FDE unavailability is
34 minutes.
Two GNSS systems
required to be
operational, (one
GNSS system for
those routes requiring
only one long range
navigation system)
Reference
Documents
FAA AC:
91-70A,
ICAO Flight
Plan Code
Item 10a
Code
Item 18
PBN/
R
A1
R
B2
FAA Order
8400.12C
EASA AMC
20-12
Notes
The GPS equipment as
installed complies with the
requirements for GPS
primary means of Class II
navigation in oceanic and
remote airspace without
reliance on other longrange navigation systems,
when used in conjunction
with the G1000 FDE
Prediction program, part
number 006-A0154-01
(010-G1000-00) or later
approved version.
No time limit using
GNSS as the primary
navigation sensor.
This does not
constitute an
operational approval.
B-RNAV /
RNAV 5
(Europe)
This does not
constitute an
operational approval.
FAA AC
90-96A
CHG 1,
EASA AMC
20-4A
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FAA APPROVED
Navigation
Specification
RNP 4
Oceanic and
Remote
Areas of
Operation
(Class II
Navigation).
Operational
Requirements/
Authorization
GNSS FDE
availability must be
verified prior to flight.
Maximum predicted
FDE unavailability is
25 minutes.
Reference
Documents
FAA AC:
91-70A,
ICAO Flight
Plan Code
Item 10a
Code
Item 18
PBN/
R
L1
FAA Order
8400.33
Two operational
long-range nav
systems, (or one
navigation system
and one GNSS
sensor for those
routes requiring only
one long-range
navigation sensor).
Notes
The GPS equipment as
installed complies with the
requirements for GPS
primary means of Class II
navigation in oceanic and
remote airspace without
reliance on other longrange navigation systems,
when used in conjunction
with the G1000 FDE
Prediction program, part
number 006-A0154-01
(010-G1000-00) or later
approved version.
Additional equipment may
be required to obtain
operational approval to
utilize RNP-4 performance.
No time limit using
GNSS as the primary
navigation sensor.
This does not
constitute an
operational approval.
RNAV 2
The GNSS RNAV
system is installed
and meets the
performance and
functional
requirements of AC
90-100A.
FAA AC
90-100A
CHG 2
R
C2
Includes RNAV Q and T
routes.
In accordance with
AC 90-100A, CHG 2,
Part 91 operators
(except subpart K)
following the aircraft
and training guidance
in AC 90-100A are
authorized to fly
RNAV 2 procedures.
Part 91 subpart K,
121, 125, 129, and
135 operators require
operational approval.
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Navigation
Specification
RNAV 1
Operational
Requirements/
Authorization
The GNSS RNAV
system is installed
and meets the
performance and
functional
requirements of AC
90-100A.
Reference
Documents
ICAO Flight
Plan Code
Notes
Item 10a
Code
Item 18
PBN/
FAA AC
90-100A
CHG 2
R
D2
Includes RNAV terminal
departure and arrival
procedures.
FAA AC
90-96A
CHG 1,
R
D2
ICAO flight plan code for
P-RNAV no longer exist.
P-RNAV utilizes RNAV 1
flight plan codes.
R
O2
Includes RNP terminal
departure and arrival
procedures.
In accordance with
AC 90-100A, Part 91
operators (except
subpart K) following
the aircraft and
training guidance in
AC 90-100A are
authorized to fly
RNAV 1 procedures.
Part 91 subpart K,
121, 125, 129, and
135 operators require
operational approval.
P-RNAV
(Europe)
This does not
constitute an
operational approval.
JAA TGL
10 Rev 1
RNP 1
In accordance with
AC 90-105, Part 91
operators (except
subpart K), following
the aircraft and
training guidance in
AC 90-105 are
authorized to fly
RNP 1 procedures.
FAA AC
90-105
Part 91 subpart K,
121, 125, 129, and
135 operators require
operational approval.
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190-01616-03 Rev. 2
FAA APPROVED
Navigation
Specification
RNP APCH
LNAV minima
Operational
Requirements/
Authorization
In accordance with
AC 90-105, Part 91
operators (except
subpart K), following
the aircraft and
training guidance in
AC 90-105 are
authorized to fly RNP
APCH LNAV minima
procedures.
Reference
Documents
FAA AC
90-105,
ICAO Flight
Plan Code
Item 10a
Code
Item 18
PBN/
R
S1
EASA AMC
20-27
Notes
Includes non-precision
approaches based on
conventional navigation
aids with “or GPS” in the
title and area navigation
approaches titled “GPS”,
“RNAV (GPS)”, and
“RNAV (GNSS)”.
Part 91 subpart K,
121, 125, 129, and
135 operators require
operational approval.
FDE/RAIM availability worldwide can be determined via the following:
• Using G1000 FDE Prediction program, part number 006-A0154-01 (010-G1000-00) or later
approved version with Garmin GA 36 antenna selected.
Also, within the United States:
• Via the FAA’s RAIM Service Availability Prediction Tool (SAPT) website: http://sapt.faa.gov.
• Contacting a Flight Service Station (not DUATS) to obtain non-precision approach RAIM.
Within Europe,
•
Using the G1000 FDE Prediction program,
•
Europe’s AUGER GPS RAIM Prediction Tool at http://augur.ecacnav.com/augur/app/home.
Determining FDE/RAIM availability is not necessary if SBAS coverage is confirmed to be available along
the entire route of flight. The route planning and FDE prediction program may be downloaded from the
Garmin G1000 website on the internet. For information on using the FDE Prediction Program, refer to
Garmin WAAS FDE Prediction Program, part number 190-00643-01, ‘FDE Prediction Program
Instructions’.
Navigation information is referenced to the WGS-84 reference system.
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FAA APPROVED
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ABBREVIATIONS AND TERMINOLOGY
The following glossary is applicable within the airplane flight manual supplement
AC
ADF
AFCS
AFM
AFMS
AIRAC
AMC
APCH
AP
APP
B-RNAV
CDI
DME
DR
DTRK
DUATS
EASA
EFIS
EHSI
ETSO
FAA
FDE
GA 36
GNSS
GPS
GPSS
GSPD
GTN
HDG
HSI
IAP
ICAO
IFR
ILS
JAA TGL
kt
LDA
LNAV
LNAV + V
LNAV/VNAV
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Advisory Circular
Automatic Direction Finder
Automatic Flight Control System
Airplane Flight Manual
Airplane Flight Manual Supplement
Aeronautical Information, Regulation, and Control
Acceptable Means of Compliance
Approach
Autopilot
Approach Phase
Basic Area Navigation
Course Deviation Indicator
Distance Measuring Equipment
Dead Reckoning
Desired Track
FAA’s Direct User Access Terminal Service
European Aviation Safety Agency
Electronic Flight Instrument System
Electronic Horizontal Situation Indicator
European Technical Standard Order
Federal Aviation Administration
Fixed Displacement Error
Garmin Antenna Model 36
Global Navigation Satellite System
Global Positioning System
Global Position Satellite System
Groundspeed
Garmin Touchscreen Navigator
AFCS heading mode
Horizontal Situation Indicator
Instrument Approach Procedure
International Civil Aviation Organization
Instrument Flight Rules
Instrument Landing System
Joint Aviation Authority Technical Guidance Letter
Knots
Localizer-Type Directional Aid
Lateral Navigation
Lateral Navigation with Advisory Vertical Guidance
Lateral Navigation / Vertical Navigation
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FAA APPROVED
LOC
LOC-BC
LOI
LP
LPV
MLS
MNPS
MSG
NAT
NM
P/N
pb
POH
P-RNAV
ODA
ODP
OFS
RAIM
RNAV
RNP
RNV
SAPT
SBAS
SDF
SID
STAR
STC
SW
TCS
TSO
TGT
TTG
V/L
VHF
VNAV
VOR
WGS-84
WX
190-01616-03 Rev. 2
FAA APPROVED
Localizer
Localizer Back Course
Loss of Integrity (GPS)
Localizer Performance
Localizer Performance with Vertical Guidance
Microwave Landing System
Minimum Navigation Performance Specification
Message
North Atlantic
Nautical Mile
Part Number
Push Button
Pilot’s Operating Handbook
Precision Area Navigation
Organization Designation Authorization
Obstacle Departure Procedure
Parallel Offset
Receiver autonomous integrity monitoring
Area Navigation
Required Navigation Performance
Area Navigation
Service Availability Prediction Tool
Satellite Based Augmentation System
Simplified Directional Facility
Standard Instrument Departure
Standard Terminal Arrival Route
Supplemental Type Certificate
Software
Touch Control Steering
Technical Standard Order
Target
Time To Go
VOR / Localizer
Very High Frequency
Vertical Navigation
VHF Omni-directional Range
World Geodetic System 1984
Weather
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190-01616-03 Rev. 2
FAA APPROVED
Section 2. Limitations
The Garmin GTN-725 Cockpit Reference Guide, part number 190-01007-04 Rev F (or later
approved revisions), must be immediately available to the flight crew.
The only approved sources of course guidance are on the external EHSI display. The moving map and CDI
depiction on the GTN display are for situational awareness only and are not approved for course guidance.
This AFMS is applicable to the software versions shown below:
Software Item
Software Version (or later FAA Approved version for this STC)
Main SW Version
5.13
GPS Software Version
5.0
Do not use SafeTaxi or Chartview functions as the basis for ground maneuvering. SafeTaxi and Chartview
are only to be used by the flight crew to orient themselves on the airport surface to improve pilot situational
awareness during ground operations.
The Glove Qualification Procedure in the Normal Procedures section of this AFMS must be successfully
completed on the ground before a glove covering the pilot’s fingers can be used while operating the
GTN 725 in flight.
Do not conduct the Glove Qualification Procedure while in flight.
GTN 725 GNSS (GPS/SBAS) Navigation system Limitations
NOTE
Limitations are in bolded text for this section only.
1. The flight crew must confirm at system initialization the currency of the Navigation database
and the database is appropriate for the region of intended operation.
2. Navigation information is referenced to WGS-84 reference system, and should only be used
where the Aeronautical Information Publication (including electronic data and aeronautical
charts) conform to WGS-84 or equivalent.
3. If the AIRAC cycle will change during flight, the flight crew must ensure the accuracy of
navigation data, including suitability of navigation facilities used to define the routes and
procedures for flight. If an amended chart affecting navigation data is published for the
procedure, the database must not be used to conduct the procedure. The Navigation database
is expected to be current for the duration of the flight.
4. GPS/SBAS based IFR enroute, oceanic, and terminal navigation is prohibited unless the flight
crew verifies and uses a valid, compatible, and current Navigation database or verifies each
waypoint for accuracy by reference to current approved data.
5. Navigation procedures with known database discrepancies are prohibited from being flown
using data from the navigation database until a new navigation database is installed in the
aircraft and the discrepancy is verified to have been corrected.
190-01616-03 Rev. 2
FAA APPROVED
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NOTE
Navigation database discrepancies can be reported at FlyGarmin.com then select “Aviation
Data Error Report”. Flight crew and operators can view Navigation data base alerts at
FlyGarmin.com then select “NavData Alerts”.
6. For flight planning purposes, IFR operations in areas where SBAS coverage is not available
along the entire route of flight, the flight crew must check FDE/RAIM availability.
7. For flight planning purposes, IFR operations within the U.S. National Airspace System on RNP
and RNAV procedures when SBAS signals are not available, the availability of GPS integrity
FDE/RAIM shall be confirmed for the intended route of flight. In the event of a predicted continuous
loss of RAIM of more than five minutes for any part of the intended route of flight, the flight should be
delayed, canceled, or re-routed on a track where FDE/RAIM requirements can be met. The flight may
also be re-planned using non-GNSS based navigational capabilities.
8. For flight planning purposes, for operations within European B-RNAV and P-RNAV airspace, if
more than one satellite is scheduled to be out of service, then the availability of GPS integrity
FDE/RAIM shall be confirmed for the intended flight (route and time). In the event of a predicted
continuous loss of FDE/RAIM of more than five minutes for any part of the intended flight, the flight
should be delayed, canceled, or re-routed on a track where FDE/RAIM requirements can be met.
9. For flight planning purposes, IFR operations where the route requires Class II navigation the
aircraft’s operator or flight crew must determine that FDE/RAIM will be available along the
intended route. Use the Garmin WFDE Prediction program to determine that there are no outages
on the specified route that would prevent the G1000 from providing primary means of Class II navigation
in oceanic and remote areas of operation that requires (RNP-10 or RNP-4) capability. If the Garmin
FDE Prediction program indicates fault exclusion (FDE/RAIM) is unavailable for more than 34 minutes
in accordance with FAA Order 8400.12C for RNP-10 requirements, or 25 minutes in accordance with
FAA Order 8400.33 for RNP-4 requirements, then the operation must be rescheduled when FDE/RAIM
is available.
10. Two GTN 725 units and two EHSI navigation displays must be operating and providing GPS
navigation guidance for operations in the following airspace:
•
•
•
•
RNP-4 (except for operations where single long range navigation system is authorized)
RNP-10 (except for operations in the Gulf of Mexico where single long range navigation
system RNP-10 is authorized)
NAT MNPS (except routes requiring only one long range navigation system)
Oceanic/Remoter Areas (Class II navigation) (except routes requiring only one long range
navigation system)
11. Manual entry of waypoints using latitude/longitude or place/bearing is prohibited for RNP and
RNAV routes.
This includes Standard Instrument Departures (SIDs) and Obstacle Departure
Procedures (ODPs), Standard Terminal Arrival (STAR), and enroute (including RNAV “Q” and RNAV
“T” routes). Whenever possible, RNP and RNAV routes should be loaded into the flight plan from the
database in their entirety, rather than loading route waypoints from the database into the flight plan
individually. Selecting and inserting individual named fixes from the database is permitted for
procedures not contained in the navigation database. In such cases, route waypoints can be loaded
into the flight plan by selecting and inserting individual named fixes from the database provided all fixes
along the published route to be flown are inserted.
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190-01616-03 Rev. 2
FAA APPROVED
12. Approach limitations utilizing GNSS for navigation:
•
“GPS”, “or GPS”, or “RNAV (GPS)” instrument approaches are prohibited unless the flight
crew verifies and uses the current Navigation database.
•
Flight crew planning on flying an RNAV instrument approach must ensure that the
Navigation database contains the planned RNAV Instrument Approach Procedure.
•
“GPS”, “or GPS”, or “RNAV (GPS)” instrument approaches must be loaded into the flight
plan by the procedure name from the Navigation database. Pilots are prohibited from flying
any approach path that contains manually entered waypoints.
•
When conducting instrument approaches referenced to true North, the NAV Angle on the
System - Units page must be set to True (To).
•
GPS based instrument approaches must be flown in accordance with an approved
instrument approach procedure that is loaded from the Navigation database.
•
IFR non-precision approach approval using the GPS/SBAS sensor is limited to published
approaches within the U.S. National Airspace System. Approaches to airports in other
airspace are not approved unless authorized by the appropriate governing authority.
•
Instrument approaches using GPS guidance may only be conducted when the GTN 725 is
operating in the approach mode. (LNAV)
•
The GTN 725 as installed in this aircraft is NOT approved for RNAV (GPS) approach
procedures including “LP”, “LPV”, “LNAV/VNAV”, or “LNAV+V”.
•
Use of the Garmin GTN 725 GPS/SBAS receivers to provide navigation guidance during the
final approach segment of an ILS, LOC, LOC-BC, LDA, SDF, MLS or any other type of
approach not approved for “or GPS” navigation is prohibited.
Note
The title of the procedure and notes on the IAP chart indicates the navigation equipment required
to join and fly an instrument approach procedure. GNSS navigation can be used as an alternate
means of navigation for the final approach segment of a VOR approach.
•
For non-RNAV (GPS) approach operations, the existing navigation receivers must be tuned
to the appropriate approach and landing frequencies prior to establishing the aircraft on the
approach.
190-01616-03 Rev. 2
FAA APPROVED
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190-01616-03 Rev. 2
FAA APPROVED
Section 3. Normal Procedures
GTN 725 Unit Power Up and Database validation
During system initialization, test annunciations are displayed. All system annunciations should
disappear typically within the first 30 seconds after power-up. Upon power-up, key annunciator lights
also become momentarily illuminated on the GTN 725 display bezel.
The splash screen displays the following information:
• Copyright
• Database List and System version
• Instrument Panel Self-Test
Current database information includes valid operating dates, cycle number, and database type. When
this information has been reviewed for currency (to ensure that no databases have expired), the pilot is
prompted to continue. Databases that are not current will be shown in amber.
Glove Qualification Procedure
This procedure is used to qualify a specific pilot/glove for use with the GTN 725 unit by guiding the user
through a variety of tasks that use the touchscreen. Due to differences in finger size and glove size, the
qualification granted by this procedure is specific to the pilot/glove.
1. Sit in the pilot’s seat.
2. Start the GTN in Demo mode by pressing and holding the Direct To key during power up.
3. Perform the tasks listed in the following table with a non-gloved hand. You do not need to record
any results for this step.
4. Perform the tasks listed in the following table with a gloved hand. For each task, determine whether
the operation is the same or worse as it was without the glove. Make a copy of the following table
and record the results. Retain a copy of these results for future reference. Items that may cause
the operation to be worse include, but are not limited to:
a. Multiple attempts to select a key
b. Unintentional selection of adjacent keys
c. Excessive force on the touchscreen to select a key
5. If all applicable tasks in the following table respond in the same way with and without a glove then
the glove used to complete these tasks may be used by the pilot.
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FAA APPROVED
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Task
Navigate to the Home Screen.
Touch the Demo key
Touch the GPS key
Touch the Waypoint key
Type “KSLE” using the touchscreen, then touch Enter.
Navigate to the Home Screen (Press HOME).
Touch the Flight Plan key.
Enter the following waypoints using the Add
Waypoint key at the bottom of the list of flight plan
waypoints:
KSLE
KMMV
KONP
BTG
Select BTG, then touch the Load Airway key to load
the following airway: V23 ALFOR.
While viewing the flight plan page, touch the Up/Down
arrow keys to scroll up and down to view the flight plan
waypoints.
Touch the Back key to return to the Home screen.
Operation With Glove (circle one)
NA
Same
Worse
Same
Worse
Same
Worse
Same
Worse
NA
Same
Worse
Same
Worse
Same
Worse
Same
Worse
Same
Worse
Tests Required for Glove Qualification
Flight Director / Autopilot Normal Operating Procedures
The GTN 725 may be coupled to the flight director and autopilot as follows:
1. On the EFIS Control Panel, press the RNV button to display RNAV information on the
EHSI.
2. On GC-600 Flight Guidance Controller couple the flight director to the desired GTN, insure
the white arrow next to the CPL switch is pointing to the appropriate side.
3. Select FD Bars to ON with switch on glareshield.
4. For Flight Director engagement select NAV on the GC-600 Flight Guidance Controller.
5. For Autopilot engagement select AP on the GC-600 Flight Guidance Controller.
No changes to the operation or annunciations have changed for the Flight Director / Autopilot.
For Flight Director / Autopilot operating instructions, refer to the approved ATR Flight Manual for
the autopilot.
EFIS Display Normal Procedures
Below are the Normal Operating procedures for the GTN Interface to the existing SPZ 6000 EFIS.
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EHSI – MAP DISPLAY (cont)
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RNV MSG is triggered by one of the messages listed in Section 2.1 of the Cockpit Reference
Guide under “Messages” on Pages 55 through 75.
Note:
Not all messages listed are applicable to the GTN 725 installation. The Cockpit Reference Guide
provides all applicable GTN 725 messages and all possible configurable functionality.
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FAA APPROVED
Section 4. Emergency Procedures
No Change
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190-01616-03 Rev. 2
FAA APPROVED
Section 5. Procedures Following Failures
Loss of GPS/SBAS Navigation Data
When the GPS/SBAS receiver is inoperative or GPS navigation information is not available or invalid, the
GTN will enter one of two modes: Dead Reckoning mode (DR) or Loss Of Integrity mode (LOI). The mode
is indicated on the GTN by an amber “DR” or “LOI”.
If the Loss of Integrity annunciation is displayed, revert to an alternate means of navigation appropriate to
the route and phase of flight.
If the Dead Reckoning annunciation is displayed, the map will continue to be displayed with an amber “DR‟
overwriting the ownship icon. Course guidance will be removed on the CDI. Aircraft position will be based
upon the last valid GPS position, then estimated by Dead Reckoning methods. Changes in true airspeed,
altitude, heading, or winds aloft can affect the estimated position substantially.
Dead Reckoning is only available in Enroute and Oceanic modes. Terminal and Approach modes do not
support Dead Reckoning.
If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) are available:
Navigation
........................ ..
USE ALTERNATE SOURCES
If No Alternate Navigation Sources Are Available:
DEAD RECKONING (DR) MODE:
Navigation
. . . . . . . . . . . . . . . . . . . . . . . ............. .
USE GTN
NOTE
All information normally derived from GPS will become less accurate over time.
LOSS OF INTEGRITY (LOI) MODE:
Navigation
................
FLY TOWARDS KNOWN VISUAL CONDITIONS
NOTE
190-01616-03 Rev. 2
FAA APPROVED
•
All information derived from GPS will be removed.
•
The airplane symbol is removed from all maps. The map will remain
centered at the last known position. “NO GPS POSITION” will be
annunciated in the center of the map.
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GPS Approach Downgrade
During a GPS approach in which GPS accuracy requirements cannot be met by the GPS receiver for any
GPS approach type, the GTN will flag all CDI guidance and display a system message “ABORT
APPROACH-GPS approach no longer available”. Immediately upon pilot acknowledgement of the
message, the unit will revert to Terminal navigation mode alarm limits. If the position integrity is within these
limits lateral guidance will be restored and the GPS may be used to execute the missed approach, otherwise
alternate means of navigation must be utilized.
If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) Are Available:
1. Navigation..........................................................................................USE ALTERNATE SOURCES
Heading Data Source Failure
Without a heading source to the GTN-725, the following features will not operate:
•
GPSS will not be provided to the autopilot for heading legs.
•
Map cannot be oriented to Heading Up.
1. Autopilot ..................................................................................... Select HDG mode for heading legs
Pressure Altitude Data Source Failure
Without a pressure altitude source to the GTN 725, automatic leg sequencing of legs requiring an altitude
source will SUSPend.
1. Manually sequence altitude legs, as prompted by the system.
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190-01616-03 Rev. 2
FAA APPROVED
Section 6. Performances
No Change.
190-01616-03 Rev. 2
FAA APPROVED
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190-01616-03 Rev. 2
FAA APPROVED
Section 7. Appendices and Supplements
No Change
190-01616-03 Rev. 2
FAA APPROVED
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190-01616-03 Rev. 2
FAA APPROVED
Section 8. System Description
Pilot’s Guide
The Garmin GTN 725 Pilot’s Guide, part number and revision listed below, contain additional information
regarding GTN system description, control and function. The Pilot’s Guide does not need to be immediately
available to the flight crew.
•
GTN 7XX Pilot’s Guide P/N 190-01007-03 Rev H or later.
190-01616-03 Rev. 2
FAA APPROVED
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