Garmin | GMA™ 342 | Garmin GMA™ 342 GMA342/345 Installation Manual

Garmin GMA™ 342 GMA342/345 Installation Manual
GMA 342/345
Installation Manual
190-01878-02
April, 2018
Revision 3
© 2018
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied,
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the express prior written consent of Garmin. Garmin hereby grants permission to download a
single copy of this manual and of any revision to this manual onto a hard drive or other electronic
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provided that such electronic or printed copy of this manual or revision must contain the complete
text of this copyright notice and provided further that any unauthorized commercial distribution of
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©2017 The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and
any use of such marks by Garmin is under license. Other trademarks and trade names are those of their
respective owners.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Aviation Panel-Mount Technical Support Line (Toll Free) 1.888.606.5482
Garmin (Europe) Ltd.
Liberty House, Hounsdown Business Park
Southampton, Hampshire SO40 9LR U.K.
Garmin aviation support and warranty information can be found at www.flygarmin.com.
RECORD OF REVISIONS
Revision
Revision Date
1
01/17/17
Initial Release
2
09/18/17
Updated Transmitter Grant of Equipment Authorization info
3
04/05/18
Updated Post Installation Checkout Procedure, added 3-COM unit info
190-01878-02
Rev. 3
Description
GMA 342/345 Installation Manual
Page A
CURRENT REVISION DESCRIPTION
Revision
3
190-01878-02
Rev. 3
Page
Number
Section
Number
ii
Front
Added note regarding 3-COM unit
iii
Front
Added Software License Agreement info
1-1, 1-2
1.2
Updated to include 3-COM unit info
1-2
1.2.1
Updated to include 3-COM unit info
1-4
1.3.2
Updated to include 3-COM unit info
1-7–1-8
1.4
1-10
1.5, 1.6
Updated to include 3-COM unit info
2-1
2.2.1
Updated to include 3-COM unit info
2-3
2.3.2
Updated washer suppliers list
2-4
2.4.1
Updated to include 3-COM unit info
2-9
2.8.5.1
Updated to include 3-COM unit info
2-10, 2-11
2.8.6
Updated Front Panel Config info
2-12
2.8.7
Updated to include 3-COM unit info
2-13
2.9.3
Updated to include 3-COM unit info
3-4–3-7
3.7
Updated Post Installation Checkout section
3-7
3.9
Updated to include 3-COM unit info
4-1, 4-2
4.2.1
Updated to include 3-COM unit pin info
4-6
4.5.2
Added Table 1-7 to include 3-COM unit info
4-7
4.5.4
Updated note regarding AUX buttons and added note for
3-COM units
4-9
4.5.7
Added Table 1-13 to include 3-COM unit info
A-1
A.2
Added note regarding 3-COM unit
A-2
A.3
Updated Figure A-1 to include 3-COM unit info
B-3
Appdx B
Added Figure B-3 Panel Cutout Drawing
C-2, C-3,
C-5–C-8
Appdx C
Updated Figure C-2, Figure C-3, Figure C-5, Figure C-6,
and Figure C-7, added Figure C-8
Description of Change
Updated certification info to include 3-COM unit info
GMA 342/345 Installation Manual
Page i
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
("EAR") issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and
which may not be exported, released, or disclosed to foreign nationals inside or outside of the United States
without first obtaining an export license. The preceding statement is required to be included on any and all
reproductions in whole or in part of this manual.
DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES
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 web site at www.garmin.com/prop65.
NOTE
Unless otherwise noted, information listed for the GMA 345 also applies to the GMA 345
3-COM version unit.
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page ii
SOFTWARE LICENSE AGREEMENT
BY USING THE DEVICE, COMPONENT OR SYSTEM MANUFACTURED OR SOLD BY GARMIN
(“THE GARMIN PRODUCT”), YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS
OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT
CAREFULLY. Garmin Ltd. and its subsidiaries (“Garmin”) grants you a limited license to use the
software embedded in the Garmin Product (the “Software”) in binary executable form in the normal
operation of the Garmin Product. Title, ownership rights, and intellectual property rights in and to the
Software remain with Garmin and/or its third-party providers. You acknowledge that the Software is the
property of Garmin and/or its third-party providers and is protected under the United States of America
copyright laws and international copyright treaties. You further acknowledge that the structure,
organization, and code of the Software are valuable trade secrets of Garmin and/or its third-party providers
and that the Software in source code form remains a valuable trade secret of Garmin and/or its third-party
providers. You agree not to reproduce, decompile, disassemble, modify, reverse assemble, reverse
engineer, or reduce to human readable form the Software or any part thereof or create any derivative works
based on the Software. You agree not to export or re-export the Software to any country in violation of the
export control laws of the United States of America.
190-01878-02
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GMA 342/345 Installation Manual
Page iii
TABLE OF CONTENTS
Section 1 General Description ...........................................................................1-1
1.1 Introduction...................................................................................................................... 1-1
1.2 Equipment Description .................................................................................................... 1-1
1.3 Technical Specifications .................................................................................................. 1-3
1.4 Certification ..................................................................................................................... 1-7
1.5 Operating Instructions.................................................................................................... 1-10
1.6 Reference Documents .................................................................................................... 1-10
Section 2 Installation Overview .........................................................................2-1
2.1 Introduction...................................................................................................................... 2-1
2.2 Installation Materials ....................................................................................................... 2-1
2.3 Available Accessories...................................................................................................... 2-2
2.4 Installation Considerations .............................................................................................. 2-4
2.5 Cabling and Wiring.......................................................................................................... 2-7
2.6 Electrical Bonding ........................................................................................................... 2-7
2.7 Cooling Air ...................................................................................................................... 2-8
2.8 Configuration, and Adjustment Options .......................................................................... 2-8
2.9 Updating Software ......................................................................................................... 2-13
2.10 Electrical Noise............................................................................................................ 2-14
2.11 Mounting Requirements .............................................................................................. 2-15
Section 3 Installation Procedure........................................................................3-1
3.1 Unpacking Unit................................................................................................................ 3-1
3.2 Electrical Connections ..................................................................................................... 3-1
3.3 Antenna Installation ......................................................................................................... 3-2
3.4 Shield Block Backshell Installation Instructions ............................................................. 3-2
3.5 Backshell Assembly......................................................................................................... 3-3
3.6 Unit Installation ............................................................................................................... 3-3
3.7 Post Installation Checkout .............................................................................................. 3-4
3.8 Continued Airworthiness ................................................................................................. 3-7
3.9 Diagnostics Information .................................................................................................. 3-7
3.10 Disabling Bluetooth Connectivity (GMA 345 only) ..................................................... 3-8
Section 4 System Interconnects .........................................................................4-1
4.1 Connector Description ..................................................................................................... 4-1
4.2 Pin List ............................................................................................................................. 4-1
4.3 Aircraft Power.................................................................................................................. 4-4
4.4 Lighting Bus .................................................................................................................... 4-5
4.5 Audio Inputs/Outputs and Mic Keys ............................................................................... 4-5
4.6 Discrete Inputs ............................................................................................................... 4-10
4.7 Marker Beacon............................................................................................................... 4-12
190-01878-02
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GMA 342/345 Installation Manual
Page iii
Section A Installation Considerations for Upgrading from a
Garmin GMA 340..............................................................................A-1
A.1 Mechanical Considerations ............................................................................................ A-1
A.2 Electrical Considerations ............................................................................................... A-1
A.3 GMA 340 to GMA 342/345 Retrofit Connections ........................................................ A-2
Appendix B Outline and Installation Drawings .............................................B-1
Appendix C Interconnect Drawings.................................................................C-1
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page iv
1 GENERAL DESCRIPTION
1.1 Introduction
This manual is intended to provide mechanical and electrical information for use in the planning and
design of an installation of the GMA 342/345 into an aircraft. This manual is not a substitute for an
approved airframe-specific maintenance manual, installation design drawing, or complete installation data
package. Attempting to install equipment by reference to this manual alone and without first planning or
designing an installation specific to your aircraft may compromise your safety and is not recommended.
The content of this manual assumes use by competent and qualified avionics engineering personnel and/or
avionics installation specialists using standard aviation maintenance practices in accordance with Title 14
of the Code of Federal Regulations and other relevant accepted practices. This manual is not intended for
use by individuals who do not possess the competencies and abilities set forth above.
NOTE
Garmin recommends installation of the GMA 342/345 by a Garmin-authorized installer.
To the extent allowable by law, Garmin will not be liable for damages resulting from
improper or negligent installation of the GMA 342/345. For questions, please contact
Garmin Aviation Product Support at 1-888-606-5482.
1.2 Equipment Description
The Garmin GMA 342/345 Audio Panels are TSO-certified products and have received FAA approval.
The GMA 342/345 units are high-fidelity digital audio panels that collect, process, and distribute audio
signals to crew and passengers. The GMA 342/345 digital signal processing (DSP) core filters the audio
signals and provides digital audio routing to minimize noise.
The GMA 342/345 provides a speaker output for use as a cockpit speaker. Both also include a cockpit
voice recorder and playback feature to help in situations where a COM transmission may need to be heard
again. The GMA 345 includes a Bluetooth® transceiver for listening to music and making phone calls, or
sending headset audio to a VIRB XE, and a 10 Watt USB charge port for phones and tablets. The
GMA 342 does not have Bluetooth capability and includes an available front panel 3.5 mm jack for
plugging in phones or tablets for music audio or cell phone calls.
Other features include intuitive configuration, a lighting bus input, SD Card socket for code loads and
Bluetooth firmware updates (only GMA 345 has Bluetooth capability), an 8 position DIP switch for
installation settings, and multiple audio switching functions. LED-illuminated push-buttons allow audio
selection and annunciation for selection of NAV, COM, and other audio. Photocell dimming circuitry
automatically adjusts the brightness of the annunciators, with backlighting controlled by the aircraft
lighting bus. A fail-safe circuit connects the pilot's headset and microphone directly to COM 1 and a failsafe warning audio input in the event that power is interrupted or the unit is turned off.
The GMA 345 has 2 music inputs in addition to the Bluetooth transceiver, NAV, COM, and ICS
selections. The GMA 342 has 2 music inputs in addition to the front panel 3.5 mm jack, NAV, COM, and
ICS selections. Both the GMA 345 and GMA 342 are easily configurable without an external PC
connection. Both GMA 345 and GMA 342 have automatic intercom squelch and optional keyed intercom
squelch. These audio panels were designed to be drop in replacements for the GMA 340, and do not
interface or integrate to any system. The standard (2-COM) version of these audio panels only support two
COMs, however a 3-COM version of the GMA 345 (011-03520-20) is also available. For installations that
require more than 2 COMs the recommended audio panel is the GMA 345 3-COM, GMA 350H, or GMA
350Hc.
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-1
NOTE
Unless otherwise noted, information listed for the GMA 345 also applies to the GMA 345
3-COM version unit.
1.2.1
Features Summary
Table 1-1 GMA 342/345 Features Summary
Feature
GMA 342
GMA 345
GMA 345 3-COM
Bluetooth Transceiver
None
1 - Not shared with Music 1 or Music 2
USB Charge Port
None
1
1 - not shared with
Music 1 or Music 2
None
3.5 mm 4-Conductor Jack
Input
Tranceiver Channels
Receiver Inputs
3 - COM 1, COM 2, TEL
4 - COM 1, COM 2,
COM 3, TEL
5 - NAV 1, NAV 2, AUX 1, AUX 2, AUX 3*
5 - NAV 1, NAV 2,
AUX 1, AUX 2,
AUX 3 **
Microphone Inputs
6 - Pilot, Copilot, 4 Passenger
Microphone Keys
2 - Pilot, Copilot
Music Inputs (rear
connector)
2
Alert Inputs (unswitched)
4
Speaker Output
1
Headset Outputs
3 - Pilot, Copilot, Passenger (passenger output can drive 4 headsets)
Discrete Inputs
5
Discrete Outputs
3
Failsafe Channel
1 - Only Heard During Power Off Mode
Lighting Bus
1
SD Card Socket
1
8 Position DIP Switch
1
*Note that two buttons (AUX1 and AUX 2) are used to select/deselect the 3 AUX inputs. Pressing the
AUX 1 button selects/deselects the AUX 1 and AUX 3 receivers. Pressing the AUX2 button selects/
deselects the AUX 2 receiver.
**Note that one button (AUX) is used to select/deselect all 3 AUX inputs. When AUX is selected, audio
from all three AUX inputs is merged and heard together.
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-2
1.3 Technical Specifications
It is the responsibility of the installing agency to obtain the latest revision of the GMA 34X Environmental
Qualification Form. This form is available directly from Garmin under the following part number:
GMA 34X Environmental Qualification Form, Garmin part number 005-00880-01
To obtain a copy of this form, see the dealer/OEM portion of the Garmin web site (www.garmin.com).
1.3.1
Physical Characteristics
Table 1-2 Physical Characteristics GMA 342/345
Characteristic
Specification
Bezel Height
1.30 inches (33.0 mm)
Bezel Width
6.30 inches (160.0 mm)
Rack Height (Dimple to Dimple)
1.33 inches (34.0 mm)
Rack Width
6.30 inches (160.0 mm)
Depth Behind Panel with Connectors (measured from face of aircraft
panel to rear of connector backshells)
8.09 inches (205.0 mm)
GMA 342/345 Weight (Unit Only)
1.10 lbs (0.49 kg)
GMA 342/345 Weight (Installed with rack, backplate, and connectors)
1.78 lbs (0.81 kg)
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-3
1.3.2
Electrical Specifications
Table 1-3 Electrical Characteristics
Characteristic
Specification
Environmental
Compliance
RTCA DO-160F
Software
Compliance
RTCA DO-178B Level D
Maximum Absolute
Audio Delay
The Input to Output delay is less than 1.1 ms for all audio I/O excluding
entertainment audio (Music, Telephone, and Bluetooth)
Altitude
55,000 Feet
Overpressure - 15,000 Feet
Maximum Days of
Continuous
Operation
49
Dedicated Transceiver inputs: 3 (including TEL) for GMA 342 and 345,
4 (including TEL) for GMA 345 3-COM unit
Dedicated Receiver inputs: 5 (per notes in Table 1-1 regarding which AUX
inputs are uniquely selectable)
Alert (unswitched) inputs: 4 (each with configurable volume)
Audio Panel
Functions
Input impedance: 600 Ω
Input isolation: 60 dB minimum
Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz
Special functions: Fail-safe operation
All inputs use MASQ™ processing (Master Avionics Squelch)
Max input 5 Vrms
Positions: 6 - Pilot, Copilot, 4 Passengers
Volume controls: 4 (Pilot ICS, Pilot Music, Copilot/Passenger ICS,
Copilot/Passenger Music)
Microphone input impedance: 150 Ω (compatible with 150 to 600 Ω mics)
Microphone bias voltage: 11 Vdc delivered through 470 Ω
Intercom Functions
Intercom isolation modes: 3 - Pilot, Crew, and All
Telephone interfaces: 1 full-duplex (use rear LRU pins or Bluetooth transceiver)
ICS Auto-Squelch/VOX: Independent DSP (digital signal processing) determined
thresholds for each mic.
Note that keyed intercom is optional. Auto-squelch not available when using
keyed ICS.
Output amplifiers: 3 Stereo - Pilot, Copilot, Passengers
Power, Load, and Distortion: 65 mW into 150 Ohms with <10%
Headphone
Outputs
THD+N @ 10% output <3% THD+N
Typical Operating Distortion: <1% THD+N
3dB Frequency Response Bandwidth: 20 Hz to 20 kHz for Music
350 Hz to 6.5 kHz for Other Audio (MICs, Radios, Alerts)
190-01878-02
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GMA 342/345 Installation Manual
Page 1-4
Table 1-3 Electrical Characteristics
Characteristic
Specification
Music inputs (stereo): 2
Music input impedance: 600 Ω (differential)
Music gain: +24dB @ max. volume
Music Functions
Music input level:<200 mVrms for full power* output @ max music volume knob
position (typ.)
3.0 Vrms max music input level
Music bandwidth: 20 Hz to 20 kHz @ full power output
Music distortion: <0.1% THD+N (typ.) @ full power, full bandwidth
*Full power output refers to 65 mW into 150 Ω at the headset
Bluetooth
Connectivity
GMA 345 only
USB Charge Port
GMA 345 only
3.5 mm
Front Panel Jack
GMA 342 only
Bluetooth 3.00 Compliant, allows music, cell phone calls, and interface with the
VIRB XE action camera. Bluetooth capability supports HFP (including HFP v1.6
Wide Band Speech mode), A2DP, and AVRCP.
The GMA 345 stores 10 paired devices and overwrites the least recently
connected device when a new device is paired. Only 1 Bluetooth connection
allowed at one time. The VIRB XE cannot be connected when using a phone
(and vice versa).
USB charge port - Rated for 10 W. The GMA 345 charge port features USB port
detection that will connect the optimum charge rate for the device connected.
The charge port supports a maximum of 2.1 Amp charge current for devices.
The USB charge port will shutdown and protect the GMA 345 for current draw
above 2.3 Amps.
The GMA 342 has a standard 3.5 mm front panel jack for connecting by cable
phones or tablets. The front panel allows stereo music to be played from a
device, and also allows cell phone calls to be made through the GMA 342. The
front panel jack is a 4 conductor jack, allowing either a standard 3 conductor plug
for audio, and also 4 conductor plugs used by some cell phones for phone calls.
For stereo music input, the jack is rated to 1.5 Vrms and has 5 kohm input
impedance.
Marker Beacon
Receiver
190-01878-02
Rev. 3
Frequency: Crystal controlled at 75 MHz
Sensitivity: LO 1000 μV hard; HI 200 μV hard
Selectivity: 6 dB @ ±10 kHz min, 40 dB @ ±200 kHz max.
Input impedance: 50Ω
External lamp drive: 125 mA max each output
Other outputs: Middle MKR sense
Special functions: SmartMuteTM marker audio muting
GMA 342/345 Installation Manual
Page 1-5
Table 1-4 Speaker Output
Aircraft Voltage
Speaker Impedance
Output Power
4Ω
3 Watts
8Ω
Not Recommended
4Ω
10 Watts
8Ω
7 Watts
14V
28V
1.3.3 Power Requirements
The GMA 342/345 will operate down to emergency voltage (9 Volts). Below 11 Volts, the USB charge
port (GMA 345 only) and the speaker (both GMA 342 and GMA 345) are disabled.
Table 1-5 GMA 342/345 Power Requirements
Characteristic
Specification
Input Voltage Range
11 to 33 Vdc
Leakage Current*
< 1 mA
*Current the unit draws when turned off (GMA 342/345 turned off by the knob).
Table 1-6 GMA 342 Power Requirements
Characteristic
Idle Current*
Typical Operating Current
Maximum Current
Current Draw
Power Consumption
0.34 A @ 14 VDC
4.76 W @ 14 VDC
0.19 A @ 28 VDC
5.32 W @ 28 VDC
0.83 A @ 14 VDC
11.62 W @ 14 VDC
0.43 A @ 28 VDC
12.04 W @ 28 VDC
1.19 A @ 14 VDC
16.66 W @ 14 VDC
0.90 A @ 28 VDC
25.20 W @ 28 VDC
*Unit current drawn with power applied, no audio, and minimum lighting.
Table 1-7 GMA 345 Power Requirements
Characteristic
Current Draw
Power Consumption
0.34 A @ 14 VDC
4.76 W @ 14 VDC
0.19 A @ 28 VDC
5.32 W @ 28 VDC
Typical Operating Current without USB charge
port being used.
0.83 A @ 14 VDC
11.62 W @ 14 VDC
0.43 A @ 28 VDC
12.04 W @ 28 VDC
Maximum Current with no USB charge port
connection
1.19 A @ 14 VDC
16.66 W @ 14 VDC
0.90 A @ 28 VDC
25.20 W @ 28 VDC
Maximum Current with USB charge port
connection
2.39 A @ 14 VDC
33.46 W @ 14 VDC
1.49 A @ 28 VDC
41.72 W @ 28 VDC
Idle Current*
*Unit current drawn with power applied, no audio, and minimum lighting.
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-6
1.4 Certification
The conditions and tests required for TSO approval of this article are minimum performance standards. It
is the responsibility of those installing this article either on or within a specific type or class of aircraft to
determine that the aircraft installation conditions are within the TSO standards. TSO articles must have
separate approval for installation in an aircraft. The article may be installed only if performed under 14
CFR part 43 or the applicable airworthiness requirements.
The GMA 345 and GMA 342 have been shown to meet compliance with the claimed TSO(s) when
interfaced with the equipment defined in this installation manual, and installed in accordance with the
requirements and limitations as defined in this installation manual.
The Appliance Project Identifier (API) for the GMA 342 and GMA 345 is GMN-01319. The API has been
used for project identification with the FAA. See applicable hardware and software part numbers to
identify appliance approvals.
1.4.1
TSO Compliance
Table 1-8 GMA 342/345 (011-03520-00 and 011-03520-10) TSO Compliance
Function
TSO/ETSO/
RTCA/EUROCAE
Category
Airborne Radio Marker
Receiving Equipment
TSO-C35d
DO-143
A
Aircraft Audio
Systems and
Equipment
TSO-C139a
DO-214A
Class Ib
Applicable LRU
Software Part
Numbers
Applicable LRU
Boot Block Part
Numbers
All
006-B2227-0( )
All
006-B2227-B( )
Table 1-9 GMA 345 (011-03520-20) TSO Compliance
Function
TSO/ETSO/
RTCA/EUROCAE
Category
Airborne Radio Marker
Receiving Equipment
TSO-C35d
DO-143
A
Aircraft Audio
Systems and
Equipment
TSO-C139a
DO-214A
190-01878-02
Rev. 3
Class Ib
Applicable LRU
Software Part
Numbers
Applicable LRU
Boot Block Part
Numbers
All
006-B2227-0()
except
006-B2227-00
and
006-B2227-01
All
006-B2227-B( )
GMA 342/345 Installation Manual
Page 1-7
1.4.2
TSO Deviations
Table 1-10 GMA 342/345 (011-03520-00, 011-03520-10, 011-03520-20) TSO Deviations
TSO
Deviation
Garmin received a deviation from TSO-C35d to not permanently and legibly marking
the unit with each TSO’s required information.
TSO-C35d
Garmin received a deviation from TSO-C35d to use FAR §45.15(b) instead of FAR
§37.7(d) as the general rules governing holders of the TSO authorizations.
Garmin received a deviation from TSO-C35d to use RTCA DO-160F instead of RTCA
DO-138 as the standard for Environmental Conditions and Test Procedures for
Airborne Equipment.
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-8
1.4.3
Transmitter Grant of Equipment Authorization
1. FCC
GMA 345 Contains FCC ID: QOQWT32I
NOTE
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
FCC RF Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
End users must follow the specific operating instructions for satisfying RF exposure compliance. This
transmitter meets both portable and mobile limits as demonstrated in the RF Exposure Analysis. This
transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except
in accordance with FCC multi-transmitter product procedures.
2. IC
GMA 345 Contains IC: 5123A-BGTWT32I
NOTE
This device complies with Innovation, Science and Economic Development Canada license-exempt RSS
standard(s). Operation is subject to the following two conditions: (1) this device may not cause
interference, and (2) this device must accept any interference, including interference that may cause
undesired operation of the device.
Cet appareil est conforme aux normes RSS sans licence du ministére Innovation, Sciences et
Développement économique Canada. Son fonctionnement est soumis aux deux conditions suivantes : (1)
ce périphérique ne doit pas causer d’interférences et (2) doit accepter toute interférence, y compris les
interférences pouvant entraîner un fonctionnement indésirable de l’appareil.
3. Declaration of Conformity (GMA 345)
Hereby, Garmin declares that this product is in compliance with the Directive 2014/53/EU. The full text of
the EU declaration of conformity is available at the following internet address:
www.garmin.com/compliance.
Radio frequency/protocol (GMA 345): Bluetooth® wireless technology 2.4 GHz @ -0.49 dBm nominal
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 1-9
1.5 Operating Instructions
For operating instructions, refer to the applicable GMA 342 Pilot’s Guide (190-01878-00),
GMA 345 Pilot’s Guide (190-01878-01), or GMA 345 3-COM Pilot’s Guide (190-01878-05).
1.6 Reference Documents
The following publications are sources of additional information for installing the GMA 342/345. The
installer should read all referenced materials along with this manual before attempting installation.
Table 1-11 Reference Documents
Part Number
190-01878-02
Rev. 3
Document
190-00149-01
GMA 340 Installation Manual
190-00313-09
Shield Block Installation Instructions
190-01878-00
GMA 342 Pilot’s Guide
190-01878-01
GMA 345 Pilot’s Guide
190-01878-05
GMA 345 3-COM Pilot’s Guide
GMA 342/345 Installation Manual
Page 1-10
2 INSTALLATION OVERVIEW
2.1 Introduction
This section provides the necessary information for the installation and checkout of the GMA 342/345
Audio Panel. Installation of the GMA 342/345 will differ according to equipment location and other
factors. The appendices contain interconnect wiring diagrams, mounting dimensions, and information
pertaining to installation.
Careful planning and consideration of the suggestions in this section are required to achieve the desired
performance and reliability from the GMA 342/345. The guidance of FAA advisory circulars AC 43.13-1B
and AC 43.13-2B, where applicable, may be found useful for making retro-fit installations that comply
with FAA regulations.
2.2 Installation Materials
2.2.1
Unit Configurations
Table 2-1 Catalog Part Numbers
Model
Catalog Part Number
Unit Only Part Number
GMA 342 Unit Only
010-01319-10
011-03520-10
GMA 342 Standard Kit (includes
items in Table 2-2)
010-01319-11
011-03520-10
GMA 345 Unit Only
010-01319-00
011-03520-00
GMA 345 Standard (includes
items in Table 2-3)
010-01319-01
011-03520-00
GMA 345 3-COM Unit Only
010-01319-20
011-03520-20
GMA 345 3-COM Standard
(includes items in Table 2-3)
010-01319-21
011-03520-20
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GMA 342/345 Installation Manual
Page 2-1
2.3 Available Accessories
2.3.1
Standard Accessories
Table 2-2 Contents of GMA 342 Standard Installation Kit
Item
Part Number
Sub-Assy, Back Plate, GMA 342/345 (also used for GMA 240/340) (Table 2-4)
011-00678-00
Conn Kit, GMA 342/345 (also used for GMA 35/350) (Table 2-5)
011-02302-00
Sub -Assy, Audio Cables, 3.5 mm Right Angle
011-02412-00
SMP, Install Rack, GMA 342/345 (also used for GMA 240/340)
115-00262-00
Table 2-3 Contents of GMA 345 Standard Installation Kit
Item
Part Number
Sub-Assy, Back Plate, GMA 342/345 (also used for GMA 240/340) (Table 2-4)
011-00678-00
Conn Kit, GMA 342/345 (also used for GMA 35/350) (Table 2-5)
011-02302-00
SMP, Install Rack, GMA 342/345 (also used for GMA 240/340)
115-00262-00
Table 2-4 Contents of GMA 342/345 Back Plate Kit (011-00678-00, also used for
GMA 240/340)
Item
Part Number
Quantity
Pre-bagged screws “D” (Table 2-6)
011-02650-03
1
Nut Cover, SMP
115-00261-00
1
Connector Plate Assembly, DCP
125-00040-00
1
Nut, Std, English, SS, #6-32
210-00036-07
1
Screw, 4-40 x 0.250, PHP, SS/P, w/NYL
211-60234-08
2
Table 2-5 Contents of GMA 342/345 Conn Kit (011-02302-00, also used for GMA 35/350)
Item
Part Number
Quantity
Backshell w/Hardware 44 pin
011-00950-02
2
Ground Adapter, Shell 1-3
011-01169-00
4
Screw 4-40 x 0.437, FLHP100, SS/P, Nylon
211-63234-11
4
Hi Density D-Sub Connector, Mil Crimp, 44 ckt
330-00185-44
2
Contact Pin, Mil Crimp, Size 22D
336-00021-00
94
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Rev. 3
GMA 342/345 Installation Manual
Page 2-2
Table 2-6 Contents of GMA 342/345 Pre-bagged Screws “D” (011-02650-03)
Item
Part Number
Quantity
Screw, 4-40 x 0.250, PHP, SS/P, w/NYL
211-60234-08
4
Cable Tie, 4.0”
231-10001-00
1
Table 2-7 Contents of GMA 342 Sub-Assy, Audio Cables, 3.5mm RA (011-02412-00)
Item
Part Number
Quantity
Cable Assembly, Audio, 3.5mm to 3.5mm, Right Angle, 4 Pole Plug
320-00571-00
1
Cable Assembly, Audio, 3.5mm to 2.5mm, Right Angle, 4 Pole Plug
320-00571-01
1
2.3.2
•
•
•
•
•
•
•
•
•
•
•
Additional Equipment Required
Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams are
detailed in Appendix C.
Hardware: #6-32 100° flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware
required to mount the GMA 342/345 installation rack is not provided.
Stereo headphone jacks (up to 6), microphone jacks (up to 6), 3.5mm stereo jacks (up to 2).
Insulating type jacks or insulating washers should be used for all jacks to isolate them from aircraft
chassis.
Tool: 3/32" Allen for tightening the unit into the rack and backplate.
Push/Pull (that can be manually reset) circuit breaker (5 Amp recommended).
Tie Wraps or Lacing Cord
Ring Terminals (for grounding) #8 size, Yellow, Blue, and Pink.
Silicon Fusion Tape (GPN 249-00114-00) to wrap the cable bundle.
Solder Sleeves for terminating the shields of the cable to the GMA 342/345 backshell.
See 190-00313-09 for part numbers.
Heat shrink tubing
SD card needed for updating software in the GMA 342/345. Garmin recommends using a 4 GB
Sandisk® SD card.
Insulating Washers for Headset and Microphone Jacks can be found at the following suppliers:
Dallas Avionics
Digi-key
100053 - Shoulder Washer
SC1147-ND - Shoulder Washer
100054 - Flat Washer
SC1146-ND - Flat Washer
Mouser
Newark
502-S-1029 – Shoulder Washer
S1029 - Shoulder Washer
502-S-1028 – Flat Washer
S1028 - Flat Washer
Switchcraft
S1029 – Shoulder Washer
S1028 – Flat Washer
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GMA 342/345 Installation Manual
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2.4 Installation Considerations
The GMA 342/345 interfaces with various avionics equipment. Fabrication of a wiring harness is required.
Sound mechanical and electrical methods and practices are required for installation of the GMA 342/345.
NOTE
3D audio is not available when using a mono headset or in aircraft wired with mono
headset jacks. 3D audio (even if enabled), will not be available with mono audio headset
jacks or mono headsets. It is recommended that stereo jacks and stereo headsets be used.
2.4.1
Auxiliary Inputs
For the GMA 345 3-COM unit, a single AUX button is used to select all 3 AUX inputs for simultaneous
monitoring.
For the GMA 342 and 345 (2-COM version), two buttons (AUX1 and AUX2) are used to select/deselect
the 3 AUX inputs. Pressing the AUX1 button selects/deselects the AUX 1 and AUX 3 receivers. Pressing
the AUX2 button selects/deselects the AUX 2 receiver.
NOTE
It is important to consider what sources are wired to the AUX 1 and AUX 3 inputs because
when AUX 1 is selected, both AUX 1 and AUX 3 receiver audio will be heard together
(this note is not applicable to the GMA 345 3-COM unit).
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2.4.2
2.4.2.1
Marker Beacon Antenna Installation
Location Considerations
The marker beacon antenna should be mounted on a flat surface on the underside of the aircraft body.
NOTE
Do not install the antenna inside the aircraft. Installing the antenna inside the aircraft
limits the antenna reception and increases the antennas susceptibility to radiation from
components inside the aircraft.
Mount the antenna so that there is a minimum of structure between it and the ground radio stations. Locate
it as far away as possible from transmitter antennas.
2.4.2.2
Marker Beacon Antenna Mounting
Install the antenna according to the antenna manufacturer’s instructions. If the antenna is being installed on
a composite aircraft, ground planes must sometimes be added. Conductive wire mesh, radials or thin
aluminum sheets embedded in the composite material provide the proper ground plane allowing the
antenna pattern (gain) to be maximized for optimum performance.
2.4.2.3
Marker Beacon Antenna Cable
Use coaxial cable meeting the applicable aviation regulation for the marker beacon antenna. Any cable
meeting specifications is acceptable for the installation. When routing antenna cables, observe the
following precautions:
•
•
•
•
All cable routing should be kept as short and as direct as possible
Avoid sharp bends
Avoid routing cables near power sources (e.g., 400 Hz generators, trim motors, etc.) or near power
for fluorescent lighting
Allow a 12 inch minimum separation between any other cables, including antenna cables (e.g
ADF, COM, NAV, GS, MARKER)
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GMA 342/345 Installation Manual
Page 2-5
2.4.2.4
Marker Beacon Antenna Cable Installation
This section provides guidance for terminating the coaxial cable into the D-Sub connector. See the system
interconnect section for pin assignments.
NOTE
Use coaxial cable meeting the applicable aviation regulation for the marker beacon
antenna. Route the cable to the D-Sub as described in Section 2.4.2.3.
When terminating the coaxial cable into the D-Sub observe the following guidance (refer to Figure 2-1):
•
•
•
Keep the distance from the end of the exposed shield to D-Sub as short as possible.
Ensure the distance from the beginning of the exposed shield to D-Sub is no more than
1.5 inches long.
Terminate the center conductor by directly connecting it to the D-sub through a crimp pin
without a pigtail.
Figure 2-1 below represents a suggested method for terminating the marker beacon coaxial cable using
M17/128-RG400 terminated into a high density D-Sub connector. Refer to Table 2-8 for Crimp Tool, Pin,
and Crimp Tool Insert part numbers.
Figure 2-1 GMA 342/345 Marker Beacon Coaxial Cable D-Sub Termination
Table 2-8 Pin and Crimp Tool Part Numbers
CRIMP TOOL
DANIELS MANUFACTUING CORP
DMC M22520/2-01 GAGE
AFM8 CRIMPING TOOL
190-01878-02
Rev. 3
PIN
Garmin Part Number
336-00021-00
Garmin Part Number
336-00044-00
CRIMP TOOL INSERT
K42
K774
GMA 342/345 Installation Manual
Page 2-6
2.4.3
Installation Approval Considerations for Pressurized Aircraft
Antenna and cable installations on pressurized cabin aircraft require FAA approved installation design and
engineering substantiation data whenever such installations incorporate alteration (penetration) of the
cabin pressure vessel by connector holes and/or mounting arrangements.
For needed engineering support pertaining to the design and approval of such pressurized aircraft antenna
installations, it is recommended that the installer proceed according to any of the following listed
alternatives:
1. Obtain approved antenna installation design data from the aircraft manufacturer.
2. Obtain an FAA approved Supplemental Type Certificate (STC) pertaining to and valid for the subject antenna installation.
3. Contact the FAA Aircraft Certification Office in the appropriate Region and request
identification of FAA Designated Engineering Representatives (DERs) who are
authorized to prepare and approve the required antenna installation engineering data.
4. Locate an appropriate consultant FAA DER, by reviewing the “FAA Consultant DER
Directory”, which can be found at the FAA “Designee and Delegation” web page.
5. Contact an aviation industry organization such as the Aircraft Electronics Association and request
their assistance.
2.5 Cabling and Wiring
Cabling and Wiring
Refer to the interconnect examples in Appendix C for wire gauge guidance.
In some cases, a larger gauge wire such as AWG #18 or #20 may be needed for power connections. If
using AWG #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each other.
This minimizes the risk of contacts touching and shorting to adjacent pins and to ground.
Use wire and cable meeting the applicable aviation regulation. When routing wire and cable, observe the
following precautions:
•
•
•
•
Keep wire and cable as short and direct as possible
Avoid sharp bends
Avoid routing near power sources (e.g. 400 Hz generators, trim motors, etc) or near power of
fluorescent lighting
For Power and Ground use 2 individual wires for the units to the power source. Do not splice 2
wires to one at the unit for power and ground.
NOTE
Avoid installing the unit near heat sources. If this is not possible, ensure that additional
cooling is provided. Allow adequate space for installation of cables and connectors. The
installer will supply and fabricate all of the cables.
2.6 Electrical Bonding
Electrical equipment, supporting brackets, and racks should be electrically bonded to the aircraft’s main
structure. Refer to SAE ARP 1870 section 5 when aluminum surface preparation is required to achieve
electrical bond. An equivalent OEM bonding procedure may also be substituted. The electrical bond
should achieve direct current (DC) resistance less than or equal to 2.5 milliohms to local structure to where
the equipment is mounted. Compliance should be verified by inspection using a calibrated milliohm
meter.
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GMA 342/345 Installation Manual
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2.7 Cooling Air
The GMA 342/345 does not have provisions for attaching cooling air, however the thermal characteristics
of the installation should always be assessed. An undesirable thermal condition could be created due to the
unit's own internal power dissipation combined with restricted ventilation, or due to heat generated by
adjacent equipment. Limiting thermal build up, by means of fan or natural convection is always a good
practice and recommended to increase the product life.
2.8 Configuration, and Adjustment Options
The GMA 342/345 has several configuration/adjustment options (see Section 2.8.6). These configuration/
adjustments are as follows:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Wired Telephone Volume
Auxiliary 1 Volume
Auxiliary 2 Volume
Auxiliary 3 Volume
Alert 1 Volume
Alert 2 Volume
Alert 3 Volume
Alert 4 Volume
Speaker Volume
Marker Beacon Volume
Passenger Address Voume
Master Avionics Squelch (Section 2.8.1)
Marker Beacon Low Sensitivity Offset (Section 2.8.2)
Marker Beacon High Sensitivity Offset (Section 2.8.2)
High Cockpit Noise Option (Section 2.8.3)
Music In Isolation Option (Section 2.8.4)
2.8.1 Master Avionics Squelch (MASQ) Function
MASQ functions to prevent low level noise from being passed to the headset ear speakers, this is known as
“squelching” or muting the audio. To “break” or “open” squelch means that enough audio signal is present
that the signal is passed through and can be heard. Increasing this setting increases the signal level
required to break/open squelch. If needed, adjust the MASQ SQ level so the audio background noise is
muted.
2.8.2 Marker Beacon Sensitivity Offset
Sensitivity Offset From Calibration. At default offset level, marker sensitivity is calibrated to 200 uV for
high sensitivity mode and 1000 uV for low sensitivity mode. Adjust up (right) if more sensitivity (earlier
indication, longer lamp dwell over beacon, lower threshold voltage) is desired. Adjust down (left) if less
sensitivity (later indication, shorter lamp dwell over beacon, higher threshold voltage) is desired. The low
and high sensitivity settings are independent and do not affect each other.
2.8.3 High Cockpit Noise Option
Enable to help reduce intercom background noise in very high noise cockpit environments. Disabled by
default.
2.8.4 Music In Isolation Option
Enable to allow pilot and copilot to hear selected music when PILOT or CREW isolation mode is active.
Disabled by default.
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Page 2-8
2.8.5
DIP Switch Configuration
The DIP switches are used to select the configuration settings listed in Table 2-9, and are located on the
right side of the unit next to the SD card slot as shown in Figure 2-2.
SD CARD SLOT
DIP SWITCHES
Figure 2-2 SD Card Slot and DIP Switch Locations
2.8.5.1
GMA 342/345 DIP Switch Configuration Settings
The GMA 342/345 DIP switch configuration settings are listed in Table 2-9. Per the label attached to
the top cover of the unit, the down switch position is ON, the up switch position is OFF.
Table 2-9 DIP Switch Configuration Settings
Switch
Function
Description
1
ENABLED KEYED
ICS
When set to ON, the intercom system (ICS) will only allow intercom
MIC audio to be heard when the corresponding ICS KEY for the MIC
position is pressed. When set to ON, auto squelch will NOT be active.
2
PILOT IN RIGHT
SEAT
This setting is for intercom 3D audio. Normally the Pilot will be
positioned to the left in the Copilot’s headset, and the Copilot will be
positioned to the right in the Pilot’s headset. When set to ON, this
setting reverses that so the Pilot is positioned to the right in the
Copilot’s headset, and the Copilot is positioned to the left in the Pilot’s
headset.
For the GMA 345 3-COM unit, this also sets which knobs control Pilot
volumes vs. Copilot/Passenger volumes.
3
MUTE ON COM
TX
When set to ON, the monitored COM radio is muted during micselected COM transmission (mic-selected COM is still heard, but not
the monitored COM radio).
4
PASSENGERS
ALWAYS GET
MUSIC 2
When set to ON, regardless of what the music source is set to (1, 2,
Bluetooth transceiver on GMA 345, or 1, 2, Jack on GMA 342),
regardless of what state of the MUSIC button is set to (ON or OFF), the
passengers will always get MUSIC 2.
5
RESERVED
LEAVE SWITCH IN OFF POSTION
6
RESERVED
LEAVE SWITCH IN OFF POSTION
7
RESERVED
LEAVE SWITCH IN OFF POSTION
8
CONFIGURATION
LOCKOUT
When set to ON, this prevents use of the GMA 342/345 config mode
UI.
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2.8.6
Front Panel Configuration
NOTE
The GMA 345 (2-COM version) is used as the example for this section. Some of the
GMA 345 3-COM unit button text labels differ from the 2-COM version. Where this
occurs, the 3-COM unit text label will be indicated in brackets following the 2-COM
version button text label. For example: SPKR key [COM3 MIC for 3-COM unit].
Enter configuration mode by holding down the COM1 MIC and SPKR [COM3 MIC for 3-COM unit]
buttons while turning the unit on.
When in configuration mode:
•
•
•
•
•
•
•
•
•
•
Pressing the PLAY button will annunciate the current software/database product version, e.g.
“system two dot zero zero”.
Pressing the COM1 MIC key selects volume mode.
◦ Press the COM1 MIC key until the desired volume is annunciated, e.g “auxiliary one
volume”.
Pressing the COM2 MIC key selects Master Avionics Squelch mode.
Pressing the SPKR [COM3 MIC for 3-COM unit] key annunciates the current option, e.g. “Music
During Isolation Enabled” or “Cockpit High Noise Disabled”.
◦ Cockpit High Noise configuration applies more filtering to the intercom mic audio. In higher
noise cockpits, this can improve voice intelligibility. In moderate to lower noise cockpits,
the default filter usually provides better intelligibility.
◦ Music During Isolation configuration changes the behavior of the PILOT and CREW
isolation modes such that music is still heard by the pilot and copilot when they are isolated
from the passengers.
Pressing the TEL key selects Marker Beacon sensitivity offset mode. Press the TEL key until the
desired Marker Beacon sensitivity mode is annunciated, e.g. "Marker Beacon Low Sensitivity".
Pressing the PILOT key increases the selected setting as indicated by the LEDs on the Level Bar.
Pressing the CREW key decreases the selected setting as indicated by the LEDs on the Level Bar.
When adjusting Options in configuration mode, the PILOT and CREW keys are used to indicate
the current state and change the state.
◦ If the option is enabled, the PILOT key is lit solid and the CREW key flashes (indicating that
the CREW key can be pushed to disable the option).
◦ If the option is disabled, the CREW key is lit solid and the PILOT key flashes (indicating
that the PILOT key can be pushed to enable the option).
◦ The Level Bar is not used when in the options mode.
The LEDs in the Level Bar (Figure 2-3) light to indicate an increase/decrease in the selected
setting.
Pressing COM1 and MKR buttons simultaneously resets the configuration and operating state
back to factory defaults.
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ABOUT:
PRESSING AUDIBLY ANNUNCIATES
SOFTWARE AND DATABASE
PRODUCT VERSIONS (BOOT
BLOCK, SYSTEM, AUDIO, AND
BLUETOOTH).
VOLUMES:
PRESSING CYCLES THROUGH
VOLUMES (AUX 1, 2, 3;
ALERT 1, 2, 3, 4;
WIRED TELEPHONE;
MARKER BEACON; SPEAKER;
SPEAKER PA).
LEVEL BAR:
TOP ROW OF KEY ANNUNCIATORS INDICATES THE SELECTED
LEVEL OF ITEM BEING ADJUSTED (VOLUME AND MASQ ONLY).
THE ANNUNCIATORS TURN ON FROM LEFT TO RIGHT AS THE
ADJUSTMENT LEVEL INCREASES.
MASQ:
PRESSING ENABLES MASQ
ADJUSTMENTS.
MARKER:
PRESSING CYCLES THROUGH
MARKER SENSITIVITY OFFSETS.
OPTIONS:
PRESSING CYCLES THROUGH OPTIONS
(COCKPIT HIGH NOISE, MUSIC DURING ISOLATION).
ADJUSTMENTS:
‘PILOT’ USED FOR INCREASING
LEVELS OR ENABLING OPTIONS.
‘CREW’ USED FOR DECREASING
LEVELS OR DISABLING OPTIONS.
Figure 2-3 Front Panel Configuration
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GMA 342/345 Installation Manual
Page 2-11
2.8.7
Hardwired Configuration Options
The configuration options in Table 2-10 are available by wiring the inputs to a pushbutton to ground (see
Figure C-2 and Figure C-3).
Table 2-10 Hardwire Configuration Options
Connector
Pin
J3401
16
Description
PILOT ICS
KEY*
Type
Function
Input
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Pilot MIC.
J3401
24
COM ACTIVE
OUT*
Output
This output is active when Receiving selected COM
audio or when transmitting on the MIC selected COM.
This output can be used to connect to other devices to
inhibit other devices from playing audio into the
GMA 342/345 while there is COM activity.
J3402
13
PASSENGER
ICS KEY*
Input
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Passenger MIC.
J3402
20
COM SWAP*
Input
When grounded the MIC selected COM will swap. For
the GMA 345 3-COM unit, this cycle includes selection
of COM 3 MIC (1, 2, 3, 1, 2, 3, ...).
J3402
22
PLAY KEY*
Input
When grounded the last voice recorded message will
play. While playing, if grounded again, the previous
message will play.
J3402
30
COPILOT ICS
KEY*
Input
If DIP switch 1 is on, this active low input, when
grounded, will allow microphone audio to the intercom
from Copilot MIC.
J3402
19
PA MODE
SELECTED*
Output
This output is active when the GMA 342/345 is in PA
mode.
J3402
12
PA MUTE OUT*
Output
This output is active when the GMA 342/345 is in PA
mode, and the Pilot or Copilot PTT is active.
*Active Low
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2.9 Updating Software
Updating software is performed using an SD card. Garmin recommends using a 4GB Sandisk® SD Card.
2.9.1
Checking Software Version
The GMA 342/345 comes pre-loaded with system software. However, if the software is out of date, it is
recommended that current software be loaded from an SD card into the GMA 342/345.
The current version of software can be retrieved in the configuration operating mode. See Section 2.8.6 for
instructions.
2.9.2
Creating a Software Loader SD Card
The software update mode allows the installer to load unit software using an SD software loader card.
NOTE
The application to create a loader card requires Windows 2000, XP, Vista, Windows 7, or
Windows 10. There is no Mac support at this time.
6. Go to the Dealer Resource Center at dealers.garmin.com.
7. Download the GMA 342/345 software to your PC.
8. Ensure that an SD card (Garmin recommends a Sandisk® brand 4GB SD card) is connected to the
PC in the SD card slot.
9. Run the executable file that was downloaded and follow the prompts on the screen to create the
software loader card.
10. After the card has been created, select finish to complete the process.
11. Remove the card from the slot. The loader card is now ready to use.
2.9.3
Loading Software to the GMA 342/345
1. Remove the unit from the rack using a 3/32” Allen tool.
2. The SD card slot is on the right side of the unit next to the DIP switches (see Figure 2-2). Insert
the SD card with pins facing down (toward the bottom of the unit).
3. Install the unit back into the rack using a 3/32” Allen tool.
4. Press and hold the following two keys while turning the unit on:
a) For GMA 342 and 345 (2-COM version): COM1 MIC key and TEL key.
b) For GMA 345 3-COM unit: COM1 MIC key and COM3 MIC key.
5. The GMA 342/345 will begin checking the SD card for updated software.
a) Do not turn the GMA 342/345 off or remove power during the update process.
b) The top row of buttons, from left to right, will indicate the progress of the update process.
c) If a problem is encountered during the update process, all buttons on the top row will flash at
a 1 Hz rate.
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6. If a problem is encountered during the update process, follow the below steps for possible
solutions.
a) Use the Pilot Knob to power cycle the GMA 342/345, then perform the process again.
b) Attempt to re-download the GMA 342/345 software to the PC, recreating the loader SD
card, and perform the process again.
c) Recreate the loader card using the recommended Sandisk® brand 4GB SD card, and attempt
the update process again.
d) If still having difficulty performing the update, contact Garmin Aviation Technical support.
7. Once the update process is finished the GMA 342/345 will automatically reboot back into normal
operating mode.
8. The update card does not need to be removed after the update process and can be left in the
GMA 342/345 at the installer’s discretion.
Once the unit has been updated, verify the correct software version is installed (see Section 2.8.6 for
instructions). For the GMA 345 only, if a Bluetooth firmware update is included with the software update,
the Bluetooth firmware will be updated automatically after the GMA 345 reboots. While a Bluetooth
firmware update is being performed in the GMA 345, the Bluetooth annunciator will blink in an ON - ON
- OFF pattern for several minutes. When the Bluetooth software update is completed, the Bluetooth
functions will return to normal operation.
2.10 Electrical Noise
Because the audio panel is a point in the aircraft where signals from many pieces of equipment are brought
together, care must be taken to minimize effects from coupled interference and ground loops.
Coupled interference can sneak into audio system interconnecting cables when they are routed near large
AC electric fields, AC voltage sources, and pulse equipment (strobes, spark plugs, magnetos, EL displays,
CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction
when they are routed near large AC current-carrying conductors or switched DC equipment (heaters,
solenoids, fans, autopilot servos, etc).
Ground loops are created when there is more than one path in which return currents can flow, or when
signal returns share the same path as large currents from other equipment. These large currents create
differences in ground potential between the various equipment operating in the aircraft. These differences
in potential can produce an additive effect at an audio panel signal input.
The audio panel may "see" the desired input signal plus an unwanted component injected by ground
differentials, a common cause of alternator-related noise. This is the main reason why all audio jacks
should be isolated from ground. Terminating audio shields just at one end eliminates another potential
ground loop injection point.
Single-point grounding cannot be overstressed for the various avionics producing and processing audio
signals. Single-point, in this context, means that the various pieces of equipment share a single common
ground connection back to the airframe. Good aircraft electrical/charging system ground bonding is also
important.
The wiring diagrams and accompanying notes in this manual should be followed closely to minimize noise
effects.
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Page 2-14
2.11
Mounting Requirements
The GMA 342/345 mounting surface must be capable of providing structural support and electrical bond to
the aircraft to minimize radiated EMI and provide protection from High-Intensity Radiation Fields (HIRF).
The GMA 342/345 is mounted using a GMA unit rack (Figure 2-4). See Section 3.6 for installation
instructions.
NOTE
Rear support is recommended to ensure a sturdy mount.
CAUTION
The top cover of the unit has a connector number (1 and 2) stamped into it and centered in
front of each connector. The 011-00678-00 backplate also has a stamped number on it. To
prevent damage to the unit, verify the connectors are positioned correctly (connector 1 is
connected in position 1) for the number 1 and number 2 locations. The stamped number 1
refers to J3401, and 2 refers to J3402.
Figure 2-4 GMA Unit Rack (115-00262-00)
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3 INSTALLATION PROCEDURE
3.1 Unpacking Unit
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred
during shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the
original shipping container and all packing materials. Do not return the unit to Garmin until the carrier has
authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate
cardboard container should be prepared that is large enough to accommodate sufficient packing material to
prevent movement.
3.2 Electrical Connections
All electrical connections to the GMA 342/345 are made through two 44-pin D-subminiature connectors
(see Figure 3-1). Section 4 defines the electrical characteristics of all input and output signals. Required
connector and associated hardware are supplied in the connector kits. Refer to Section 2.3 for the
GMA 342/345 standard kit part numbers that contain the necessary hardware. See Appendix C for
interconnect wiring diagrams.
CAUTION
Check wiring connections for errors before inserting the GMA 342/345 into the rack.
Incorrect wiring could cause internal component damage.
Table 3-1 Pin Contact Part Numbers
44 pin D-Subminiature Connectors (P3401, P3402)
Manufacturer
18-20 AWG
(Power and Ground Only)
22-28 AWG
Garmin P/N
336-00044-00*
336-00021-00
Military P/N
N/A
M39029/58-360
*Used for 18 AWG wire, is not included in the GMA 342/345 installation kits, and is not needed to install
a GMA 342/345. GPN 336-00021-00 is used for 22 AWG wire and is included in the GMA 342/345
installation kits. Use the 336-00044-00 if installing 18 AWG wire for Power and Ground.
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Table 3-2 Recommended Crimp Tools
Manufacturer
Hand
Crimping
Tool
18-20 AWG
Positioner
22-28 AWG
Insertion/
Extraction
Tool (Note 2)
Positioner
Insertion/
Extraction
Tool
Military P/N
M22520/2-01
N/A
M81969/1-04
M22520/2-09
M81969/1-04
Positronic
9507
9502-11
M81969/1-04
9502-3
M81969/1-04
AMP
601966-1
N/A
91067-1
601966-6
91067-1
Daniels
AFM8
K774
M81969/1-04
K42
M81969/1-04
Astro
615717
N/A
M81969/1-04
615725
M81969/1-04
NOTE
1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to
change without notice.
2. Extracting #18 and #20 contacts requires that the expanded wire barrel be cut off from the contact.
It may also be necessary to push the pin out from the face of the connector when using an extractor
due to the absence of the wire. A new contact must be used when reassembling the connector.
3.3 Antenna Installation
Install the antenna according to the antenna manufacturer’s instructions.
3.3.1
Antenna Cable Connectors
The antenna cable requires a BNC plug connector. Follow BNC connector manufacturer instructions for
assembly of the BNC connector.
3.4 Shield Block Backshell Installation Instructions
3.4.1
Backshell Installation Parts
The GMA 342/345 connector kit includes two Garmin backshell assemblies. Garmin’s backshell
connectors give the installer the ability to quickly and easily terminate shield grounds at the backshell
housing using the Shield Block. To assemble the backshell connectors and grounding system, refer to
instructions provided in the Shield Block Installation Instructions (190-00313-09).
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GMA 342/345 Installation Manual
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3.5 Backshell Assembly
The GMA 342/345 connector kit includes two Garmin backshell assemblies. Garmin’s backshell
connectors give the installer the ability to quickly and easily terminate shield grounds at the backshell
housing using the Shield Block. To assemble the backshell connectors and grounding system, refer to
instructions provided in the refer to instructions provided in the Shield Block Installation Instructions
(190-00313-09).
J3402
J3401
Figure 3-1 Rear View of Rack and Connectors
3.6 Unit Installation
CAUTION
Do not use excessive force when inserting the GMA 342/345 into the rack. This may
damage the connectors, unit, and/or rack. If heavy resistance is felt during installation,
stop! Remove the GMA 342/345 and identify the source of resistance.
3.6.1
GMA 342/345 Installation:
For final installation and assembly, refer to the outline and installation drawings Figure B-1 and Figure B-2
1. Assemble the backshell as described in Section 3.5.
2. Connect both backshells to the rear plate using the screws provided in the connector kit
(Figure B-2).
3. Mount the GMA 342/345 to the GMA rack as shown on the installation drawing.
4. Assemble the rear plate into the GMA 342/345 unit rack.
5. Insert the GMA 342/345 into the rack, noting proper orientation as shown on the installation
drawing.
6. Lock the GMA 342/345 in place using a 3/32” Allen tool.
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3.7
Post Installation Checkout
CAUTION
Check wiring connections for errors before inserting the GMA 342/345 into the rack.
Incorrect wiring could cause internal component damage.
An in-aircraft checkout may be performed in the aircraft on the ramp with known good microphone,
headset, and avionics receivers.
3.7.1
Failsafe Operation Check
1. Remove power to the unit by pulling the GMA 342/345 breaker.
2. Connect a mono headset to the pilot’s headset output jack and pilot’s mic jack.
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. This short occurs because of the
physical design of the headset plug contacts and is an inevitable consequence of plugging
a mono headset into a stereo jack. During power-on operation, this short will not damage
the audio panel.
3. Verify that COM1 transceiver can be heard in the pilot’s headset.
4. 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).
5. Apply unit power by restoring the audio breaker to the normal operating position
3.7.2
Transceiver Operational Check
1. Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone
key, and audio over the headphone.
2. Verify that communications are loud and clear and PTT operation is correct.
3.7.3
Aircraft Receivers Check
1. Select the audio source corresponding to each installed avionics unit and check for audio over the
headsets.
2. Verify each installed unswitched (alert) source can be heard when the source is instructed to play a
simulated alert/message.
NOTE
For the GMA 342 and 345 (2-COM version) unit AUX inputs, pressing the AUX1 button
selects/deselects the AUX 1 and the AUX 3 receiver. Pressing the AUX2 button selects/
deselects the AUX 2 receiver.
NOTE
For the GMA 345 3-COM unit, a single AUX button is used to select all 3 AUX inputs for
simultaneous monitoring.
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3.7.4
Music System Check
1. Set GMA 342/345 to ALL mode with Pilot and Crew button off.
2. Connect a stereo audio source to MUSIC 1. Verify that stereo audio is heard over all headset
positions when MUSIC 1 is selected as the music source and the MUSIC LED is on. Verify that
music volume adjustment is working properly for Pilot, Copilot, and Passengers (if passenger
headsets are wired).
3. Connect a stereo music source to MUSIC 2. Verify that stereo audio is heard when MUSIC 2 is
selected as the music source and MUSIC LED is on.
3.7.5
Bluetooth Music System Check (GMA 345 only)
Use the following steps to Pair and wirelessly connect a Bluetooth equipped phone or tablet to the
GMA 345. Pairing mode allows a new device to discover and create a connection to the GMA 345.
Additionally, pairing mode is used to forcefully disconnect a device currently connected to the GMA 345.
NOTE
The Bluetooth annunciation is illuminated only when a Bluetooth device is connected.
1. Press and hold the TEL (PAIR) Key for one second to enter pairing mode. The Bluetooth
annunciator flashes to indicate the GMA 345 is in pairing mode and “Pairing Enabled” audio is
played. Once the Bluetooth annunciator flashes, the GMA is discoverable for two minutes, or until
a device is paired or connected. While discoverable, a Bluetooth enabled device (e.g., cellphone or
tablet) can find and pair with the GMA. Refer to the device’s instruction manual for information
on how to pair and connect to a new Bluetooth device. Once paired and connected, the Bluetooth
annunciator on the GMA stops flashing and remains lit as long as the Bluetooth connection is
active. The GMA remembers the last 10 paired devices. When the paired devices list is full and a
new device is paired, the least recently connected device is removed from the paired device list.
2. Play music on a device using the Bluetooth connection and adjust the device volume near
maximum.
3. With the MUSIC button on and the Bluetooth music system selected, verify music is heard in the
connected headsets and that the music volume on the GMA 345 adjusts the volume in the headset.
4. Disable radio and ICS muting by pressing and holding the AUX2 key.
NOTE
To ensure the music audio is not being muted by ICS or by COM audio, disable radio and
ICS muting. Also, deselect the PILOT or CREW buttons so that there is no ICS Isolation.
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3.7.6
Speaker Check
1. If a speaker was installed, select SPKR and receive COM audio on the selected COM. When the
speaker is selected, the selected Receivers on the GMA 342/345 (COM, NAV, AUX) should be
heard from the speaker.
2. Initiate PA (Passenger Address) mode and verify that from both the pilot and copilot position, the
crew position that is pressing PTT has the respective mic audio delivered to the speaker clearly.
NOTE
If a loud squeal is heard while testing the PA, it is likely caused by acoustic feedback
between the speaker and the mic. Physically separating the speaker and microphone
should resolve this issue. If the speaker and mic cannot be placed sufficiently apart, a
lower volume configuration should be used. Some installations may not have sufficient
distance between the speaker and crew seat positions for reliable PA to speaker operation.
In these conditions, the “PA to speaker” volume can be set very low and PA audio will still
be delivered to the headsets.
CAUTION
Be sure to check all aircraft control movements before flight is attempted to ensure that the
wiring harness does not touch any moving part.
3.7.7
Marker Beacon Operation (if installed)
1. With a marker signal generator/transmitter test set, generate Marker Tones.
2. From the pilot headset position, verify that marker audio can be heard when selected.
3. If the system includes integrated lamp annunciation and/or if external lamps are installed, verify
that each marker tone illuminates the proper lamp.
NOTE
The Marker Lamps will operate even if the marker audio is not selected.
Outer Marker – Blue Lamp – 400 Hz (AM or received audio tone)
Middle Marker – Amber Lamp – 1300 Hz (AM or received audio tone)
Inner Marker – White Lamp – 3000 Hz (AM or received audio tone)
NOTE
To adjust the Marker beacon volume, put the unit into configuration mode as shown in
Section 2.8.6, cycling to the Marker Beacon volume, then adjusting with the crew and pilot
buttons as described in Section 2.8.6.
4. Verify that during HI SENS operation, the RF threshold is more sensitive (marker audio/indication
occurs as a lower RF power) when the GMA 342/345 is in HI SENSE.
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3.7.8
Other Optionally Installed I/O
Verify any other installed/configured inputs and outputs operate properly. Possible examples include: ICS
keys, Play key, PA Mute output, PA Mode Selected output, COM Active output, and Middle Marker Sense
output.
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to
ensure satisfactory performance of the audio functions.
3.8 Continued Airworthiness
Other than for regulatory checks, maintenance of the GMA 342/345 is "on condition" only. Periodic
maintenance of the GMA 342/345 is not required.
3.9 Diagnostics Information
The GMA 342/345 is capable of displaying diagnostics information while in normal mode of operation. To
show the diagnostics information press the PLAY button for five seconds. While still holding the PLAY
button, all button annunciators will turn off except for those associated with certain diagnostic states. All
button annunciators are off if no diagnostic information is available. The image below depicts which
button annunciators are associated with which diagnostic states.
NOTE
The GMA 345 (2-COM version) is used as the example for this section. Some of the
GMA 345 3-COM unit button text labels differ from the 2-COM version.
Press-n-Hold PLAY
Diagnostics Mode
COM2
Pilot HS Right Short
COM1
Pilot HS Left Short
NAV2
Copilot HS Right Short
NAV1
Copilot HS Left Short
PILOT
Hardware Fault
•
•
•
AUX1
Pass HS Right Short
MUSIC
Pass HS Left Short
CREW
Software Load Fault
Figure 3-2 Diagnostics Mode (2-COM version shown)
A Headset Short indication means that the unit has detected the associated headset wire is shorted
to ground or to another headset channel. No headset short should be detected if the headset jack is
wired for a stereo jack, and the headset is a stereo headset. A headset short may be detected for a
mono headset.
A Hardware Fault indication means the unit has detected an internal unrecoverable fault. Contact
Garmin Aviation Customer support for assistance.
A Software Load Fault indication means the previous software update didn’t complete
successfully. Retry loading software from the loader card to resolve this fault.
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GMA 342/345 Installation Manual
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3.10 Disabling Bluetooth Connectivity (GMA 345 only)
To aid in troubleshooting the GMA 345, Bluetooth connectivity can be disabled. To disable Bluetooth
connectivity:
1. Press and hold the TEL key for 5 seconds.
2. An audio clip will be heard in the headset that says “Bluetooth Disabled”.
3. To re-enable Bluetooth connectivity without power cycling, press and hold the TEL key for 5
seconds.
4. An audio clip will be heard in the headset that says “Bluetooth Enabled”.
NOTE
Once disabled, the GMA 345 Bluetooth connectivity does not remain disabled after power
cycling. The GMA 345 Bluetooth connectivity is always enabled following a power cycle.
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GMA 342/345 Installation Manual
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4 SYSTEM INTERCONNECTS
4.1 Connector Description
The GMA 342/345 has two 44-pin connectors located at the rear of the unit designated J3401 and J3402
which are oriented as shown in Figure 4-1. The GMA 342/345 is installed into a rack with shield block
backshells.
J3402
J3401
Figure 4-1 Rear View of Backplate and Connectors
4.2 Pin List
Figure 4-2 Rear Connectors J3401 & J3402, Viewed from Back of Unit
J3401 and J3402 pins are configured as shown in Figure 4-2. J3401 and J3402 pin assignments are given
in Table 4-1, Table 4-2, and Appendix C.
Following the Table 4-1 & Table 4-2, additional tables group pin connections by function.
An asterisk (*) following a signal name denotes that the signal is active low logic. Active low inputs are
connected to ground to activate. Active low outputs sink current to ground when active.
4.2.1
J3401 Connector
Table 4-1 J3401 Pin Assignments
Pin
Pin Name
I/O
1
MARKER ANTENNA HI
IN
2
MARKER ANTENNA LO
--
3
4
WIRED TEL AUDIO IN (GMA 342/345)
IN
COM 3 AUDIO IN (GMA 345 3-COM unit only)
WIRED TEL AUDIO LO (GMA 342/345)
--
COM 3 AUDIO LO (GMA 345 3-COM unit only)
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
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GMA 342/345 Installation Manual
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Table 4-1 J3401 Pin Assignments
Pin
5
6
Pin Name
I/O
WIRED TEL MIC OUT (GMA 342/345)
OUT
COM 3 MIC OUT (GMA 345 3-COM unit only)
RESERVED (GMA 342/345)
OUT
COM 3 MIC KEY* OUT (GMA 345 3-COM unit only)
7
RCVR 4 AUDIO IN HI (AUX 2)
IN
8
RCVR 4 AUDIO IN LO (AUX 2)
--
9
COM 1 AUDIO IN HI
IN
10
COM 1 AUDIO LO
--
11
COM 1 MIC AUDIO OUT HI
OUT
12
COM 1 MIC KEY* OUT
OUT
13
COM 2 AUDIO IN HI
IN
14
COM 2 AUDIO LO
--
15
COM 2 MIC AUDIO OUT HI
16
PILOT ICS KEY*
IN
17
NAV 1 AUDIO IN HI
IN
18
NAV 1 AUDIO IN LO
--
19
NAV 2 AUDIO IN HI
IN
20
NAV 2 AUDIO IN LO
--
21
RCVR 3 AUDIO IN HI (AUX 1)
IN
22
RCVR 3 AUDIO IN LO (AUX 1)
--
23
RCVR 5 AUDIO IN HI (AUX 3)
IN
24
COM ACTIVE* OUT
25
26
27
28
OUT
OUT
RESERVED (GMA 342/345)
--
WIRED TEL AUDIO IN HI (GMA 345 3-COM unit only)
IN
RESERVED (GMA 342/345)
--
WIRED TEL AUDIO IN LO (GMA 345 3-COM unit only)
IN
RESERVED (GMA 342/345)
--
WIRED TEL MIC OUT HI (GMA 345 3-COM unit only)
OUT
RESERVED (GMA 342/345)
--
WIRED TEL MIC OUT LO (GMA 345 3-COM unit only)
OUT
29
ALERT 3 AUDIO IN HI
IN
30
COM 2 MIC KEY* OUT
OUT
31
ALERT 1 AUDIO IN HI
IN
32
ALERT 1 AUDIO IN LO
--
33
PILOT MIC AUDIO IN HI
IN
34
PILOT MIC KEY* IN
IN
35
PILOT MIC AUDIO IN LO
--
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
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GMA 342/345 Installation Manual
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Table 4-1 J3401 Pin Assignments
Pin
Pin Name
I/O
36
INNER MARKER LAMP OUT
OUT
37
OUTER MARKER LAMP OUT
OUT
38
MIDDLE MARKER LAMP OUT
OUT
39
MIDDLE MARKER SENSE OUT
OUT
40
PASS HEADSET AUDIO OUT LEFT
OUT
41
PASS HEADSET AUDIO OUT RIGHT
OUT
42
PASS HEADSET AUDIO OUT LO
--
43
ALERT 3, 4, AUX 3 AUDIO IN LO
--
44
ALERT 4 AUDIO IN HI
IN
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
4.2.2
J3402 Connector
Table 4-2 J3402 Pin Assignments
Pin
Pin Name
I/O
1
PILOT HEADSET AUDIO OUT LO
--
2
COPILOT HEADSET AUDIO OUT LO
--
3
COPILOT HEADSET AUDIO OUT LEFT
OUT
4
COPILOT HEADSET AUDIO OUT RIGHT
OUT
5
LIGHTING BUS 14V LO/28V LO
--
6
LIGHTING BUS 14V HI/28V LO
IN
7
LIGHTING BUS 14V HI/28V HI
IN
8
AIRCRAFT POWER
IN
9
AIRCRAFT POWER
IN
10
POWER GROUND
--
11
POWER GROUND
--
12
PA MUTE* OUT
13
PASSENGER ICS KEY*
IN
14
ALERT 2 LO, FAILSAFE AUDIO IN LO
--
15
ALERT 2 AUDIO IN HI
IN
16
PILOT HEADSET AUDIO OUT LEFT
17
RESERVED
--
18
RESERVED
--
19
PA MODE SELECTED*
20
COM SWAP*
IN
21
GROUND
--
22
PLAY KEY*
IN
OUT
OUT
OUT
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
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GMA 342/345 Installation Manual
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Table 4-2 J3402 Pin Assignments
Pin
Pin Name
I/O
23
MUSIC 1 IN LEFT
IN
24
MUSIC 1 IN RIGHT
IN
25
MUSIC 1 IN LO
--
26
MUSIC 2 IN LEFT
IN
27
MUSIC 2 IN RIGHT
IN
28
MUSIC 2 IN LO
--
29
FAILSAFE WARN AUDIO IN HI
IN
30
COPILOT ICS KEY*
IN
31
PILOT HEADSET AUDIO OUT RIGHT
32
COPILOT MIC AUDIO IN HI
IN
33
COPILOT MIC KEY* IN
IN
34
COPILOT MIC AUDIO IN LO
--
36
PASS 1 MIC AUDIO IN LO
--
37
PASS 2 MIC AUDIO IN HI
IN
38
PASS 2 MIC AUDIO IN LO
--
39
PASS 3 MIC AUDIO IN HI
IN
40
PASS 3 MIC AUDIO IN LO
--
41
PASS 4 MIC AUDIO IN HI
IN
42
PASS 4 MIC AUDIO IN LO
--
43
SPEAKER AUDIO OUT LO
--
44
SPEAKER AUDIO OUT HI
OUT
OUT
*Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
4.3 Aircraft Power
The GMA 342/345 has four pins for aircraft power bus inputs. Use one wire for each of the pins
connecting to the aircraft power and ground. Do not splice the power and ground pins at the unit and use
only one wire to aircraft power and ground.
Table 4-3 Aircraft Power
Pin
Connector
8
J3402
AIRCRAFT POWER
IN
9
J3402
AIRCRAFT POWER
IN
10
J3402
POWER GROUND
--
11
J3402
POWER GROUND
--
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Pin Name
I/O
GMA 342/345 Installation Manual
Page 4-4
4.4 Lighting Bus
The GMA 342/345 can be configured to track a 14 or 28 Vdc lighting bus using these inputs. Refer to
Appendix C for lighting interconnections.
Backlighting refers only to the lighting of the text labels on the front panel and is controlled by the inputs
in Table 4-4. The brightness of the LED annunciators that illuminate each key when selected is controlled
by a photocell that operates independently of the backlight input.
NOTE
If the lighting bus inputs are not connected, the backlighting will use the photocell.
Table 4-4 Lighting Bus
Pin
Connector
Pin Name
I/O
5
J3402
LIGHTING BUS 14V LO/28V LO
--
6
J3402
LIGHTING BUS 14V HI/28V LO
IN
7
J3402
LIGHTING BUS 14V HI/28V HI
IN
4.5 Audio Inputs/Outputs and Mic Keys
4.5.1
Mic Audio Inputs and Mic Keys
Table 4-5 Mic Audio Inputs and Mic Keys
Pin
Connector
Pin Name
34
J3401
PILOT MIC KEY* IN
33
J3402
COPILOT MIC KEY* IN
33
J3401
PILOT MIC AUDIO IN HI
35
J3401
PILOT MIC AUDIO IN LO
32
J3402
COPILOT MIC AUDIO IN HI
34
J3402
COPILOT MIC AUDIO IN LO
35
J3402
PASS 1 MIC AUDIO IN HI
36
J3402
PASS 1 MIC AUDIO IN LO
37
J3402
PASS 2 MIC AUDIO IN HI
38
J3402
PASS 2 MIC AUDIO IN LO
39
J3402
PASS 3 MIC AUDIO IN HI
40
J3402
PASS 3 MIC AUDIO IN LO
41
J3402
PASS 4 MIC AUDIO IN HI
42
J3402
PASS 4 MIC AUDIO IN LO
Description
I/O
Enables respective MIC audio into
the selected transceiver unit
IN
Pilot Mic audio input and ground
reference
IN
Copilot Mic audio input and ground
reference
IN
Passenger 1 Mic audio and ground
reference
IN
Passenger 2 Mic audio and ground
reference
IN
Passenger 3 Mic audio and ground
reference
IN
Passenger 4 Mic audio and ground
reference
IN
IN
--
--
--
--
--
--
*Denotes Active Low (Ground to activate)
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GMA 342/345 Installation Manual
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4.5.2
COM Audio and Mic Keys
Table 4-6 COM Audio and Mic Keys (GMA 342/345 2-COM unit only)
Pin
Connector
Pin Name
Description
I/O
12
J3401
COM 1 MIC KEY* OUT
30
J3401
COM 2 MIC KEY* OUT
Enables transmission on the
respective transceiver unit
9
J3401
COM 1 AUDIO IN HI
COM 1 Audio Input
11
J3401
COM 1 MIC AUDIO OUT HI
COM 1 Audio Output
10
J3401
COM 1 AUDIO LO
Ground Reference for COM 1
--
13
J3401
COM 2 AUDIO IN HI
COM 2 Audio Input
IN
15
J3401
COM 2 MIC AUDIO OUT HI
COM 2 Audio Output
14
J3401
COM 2 AUDIO LO
Ground Reference for COM 2
OUT
OUT
IN
OUT
OUT
--
*Denotes Active Low (grounded when active)
Table 4-7 COM Audio and Mic Keys (GMA 345 3-COM unit only)
Pin
Connector
Pin Name
Description
I/O
3
J3401
COM 3 AUDIO IN
COM 3 Audio Input
(GMA 345 3-COM unit only)
IN
4
J3401
COM 3 AUDIO LO
Ground Reference for COM 1
(GMA 345 3-COM unit only)
--
5
J3401
COM 3 MIC OUT
COM 3 Audio Output
(GMA 345 3-COM unit only)
OUT
6
J3401
COM 3 MIC KEY* OUT
Enables transmission on the
respective transceiver unit
(GMA 345 3-COM unit only)
OUT
*Denotes Active Low (grounded when active)
4.5.3
Alert Audio I/O
Table 4-8 Alert Audio I/O
Pin
Connector
31
J3401
ALERT 1 AUDIO IN HI
Alert 1 Audio Input
IN
32
J3401
ALERT 1 AUDIO IN LO
Ground Reference for Alert 1
--
15
J3402
ALERT 2 AUDIO IN HI
Alert 2 Audio Input
IN
14
J3402
ALERT 2 LO, FAILSAFE AUDIO
IN LO
Ground Reference for Alert 2
29
J3401
ALERT 3 AUDIO IN HI
Alert 3 Audio Input
IN
43
J3401
ALERT 3, 4, AUX 3 AUDIO IN LO
Ground Reference for Alert 3 & 4
--
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Pin Name
Description
I/O
GMA 342/345 Installation Manual
Page 4-6
Table 4-8 Alert Audio I/O
Pin
Connector
44
J3401
4.5.4
Pin Name
ALERT 4 AUDIO IN HI
Description
Alert 4 Audio Input
I/O
IN
RCVR, AUX, and NAV Audio Inputs
Table 4-9 AUX and NAV Audio Inputs
Pin
Connector
Pin Name
Description
I/O
21
J3401
RCVR 3 AUDIO IN HI
(AUX 1)
RCVR 3/AUX 1 Audio Input
IN
22
J3401
RCVR 3 AUDIO IN LO
(AUX 1)
Ground Reference for RCVR 3/AUX
1 Input
--
7
J3401
RCVR 4 AUDIO IN HI
(AUX 2)
RCVR 4/AUX 2 Audio Input
IN
8
J3401
RCVR 4 AUDIO IN LO
(AUX 2)
Ground Reference for RCVR 4/AUX
2 Input
--
23
J3401
RCVR 5 AUDIO IN HI
(AUX 3)
RCVR 5/AUX 3 Audio Input
IN
43
J3401
ALERT 3, 4 AUX 3 AUDIO
IN LO
Ground Reference for RCVR 5/AUX
3 Audio Input
--
17
J3401
NAV 1 AUDIO IN HI
NAV 1 Audio Input
IN
18
J3401
NAV 1 AUDIO IN LO
NAV 1 Ground Reference
--
19
J3401
NAV 2 AUDIO IN HI
NAV 2 Audio Input
IN
20
J3401
NAV 2 AUDIO IN LO
NAV 2 Ground Reference
--
NOTE
For GMA 342/345 2-COM units only, two buttons (AUX1 and AUX2) are used to select/
deselect the 3 AUX inputs. Pressing the AUX1 button selects/deselects the AUX 1 and
AUX 3 receivers. Pressing the AUX2 button selects/deselects the AUX 2 receiver.
NOTE
For the GMA 345 3-COM unit, a single AUX button is used to select all 3 AUX inputs for
simultaneous monitoring.
190-01878-02
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GMA 342/345 Installation Manual
Page 4-7
4.5.5
Failsafe Warning Audio
Failsafe audio is audio from another device that is heard when the GMA 342/345 is in failsafe mode
(power off or unit failure) and is desired to be heard in addition to the COM audio.
Table 4-10 Failsafe Warning Audio
Pin
Connector
Pin Name
Description
I/O
29
J3402
FAILSAFE WARN AUDIO
IN HI
In the event of power loss, if wired,
failsafe warning audio will be heard in the
Pilot’s Left headset in addition to the
COM1 Audio Input.
IN
14
J3402
ALERT 2 LO, FAILSAFE
AUDIO IN LO
Ground Reference for Failsafe Warning
Audio Input
--
CAUTION
During failsafe mode both FAILSAFE WARN AUDIO IN HI and COM 1 AUDIO INPUT
are connected to the PILOT HEADSET LEFT OUTPUT. When in failsafe the output of the
COM 1 radio and the output of the device connected to FAILSAFE WARN AUDIO IN HI
will become shorted together, potentially causing damage or interference. If the
FAILSAFE WARN AUDIO IN HI is used, it may be necessary to install summing resistors
in series between these sources and the inputs to the audio panel to protect the outputs
from damage.
4.5.6
Music Inputs
The MUSIC LO signals are not the same reference as other ground connections. The MUSIC LO signals
should be used as part of a differential pair (along with the MUSIC RIGHT and MUSIC LEFT signals). If
the MUSIC LO signal is tied to a ground connection, the music will contain noise, and the audio quality
will be degraded.
Table 4-11 Music Inputs
Pin
Connector
23
J3402
MUSIC 1 IN LEFT
24
J3402
MUSIC 1 IN RIGHT
25
J3402
MUSIC 1 IN LO
26
J3402
MUSIC 2 IN LEFT
27
J3402
MUSIC 2 IN RIGHT
28
J3402
MUSIC 2 IN LO
190-01878-02
Rev. 3
Pin Name
Description
I/O
Music 1 Input
IN
Differential Reference for Music 1
--
Music 2 Input
IN
Differential Reference for Music 2
--
GMA 342/345 Installation Manual
Page 4-8
4.5.7
Tel Audio I/O
Table 4-12 TEL Audio/XCVR 3 I/O (GMA 342/345 2-COM unit only)
Pin
Connector
3
J3401
4
5
Pin Name
Description
I/O
XCVR 3 AUDIO IN (WIRED TEL)
Telephone Audio Input
IN
J3401
XCVR 3 AUDIO LO (WIRED TEL)
Ground Reference for Telephone
--
J3401
XCVR 3 MIC OUT HI (WIRED TEL)
TEL MIC Audio Output
OUT
Table 4-13 TEL Audio I/O (GMA 345 3-COM unit only)
Pin
Connector
25
J3401
WIRED TEL AUDIO IN HI
Telephone Audio Input
(GMA 345 3-COM unit only)
IN
26
J3401
WIRED TEL AUDIO IN LO
Ground Reference for Telephone
(GMA 345 3-COM unit only)
--
27
J3401
WIRED TEL MIC OUT HI
TEL MIC Audio Output
(GMA 345 3-COM unit only)
28
J3401
WIRED TEL MIC OUT LO
Ground Reference for Telephone
(GMA 345 3-COM unit only)
4.5.8
Pin Name
Description
I/O
OUT
--
Headset Outputs
Garmin recommends that stereo headsets and stereo jacks be used to fully utilize the 3D audio features of
the GMA 342/345. A true mono headset will work correctly with the GMA 342/345, but only mono (left
channel) audio will be heard, and 3D audio will not be available (even if enabled). The GMA 342/345 will
detect the mono headset (if stereo jacks are used), and automatically switch to mono operation. 3D audio
is not available with mono headsets or in installations that use mono jacks for the headsets.
In aircraft systems that are wired with stereo headset jacks, if a true mono headset is plugged into the jack,
the right audio channel is shorted to ground. In this condition the GMA 342/345 will detect the right
channel short, and turn off the right channel audio to the headset output to protect the GMA 342/345
headset output from driving a signal into a short (and also for internal audio routing determined by the
mono headset plugged into the headset jack).
In aircraft systems that use mono headset jacks, and are wired correctly (if used, mono jacks should always
use left channel audio and headset lo), 3D audio will not be available, and only left channel audio for
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page 4-9
music inputs or headset outputs will be heard.
Table 4-14 Headset Outputs
Pin
Connector
16
J3402
PILOT HEADSET AUDIO
OUT LEFT
31
J3402
PILOT HEADSET AUDIO
OUT RIGHT
1
J3402
PILOT HEADSET AUDIO
OUT LO
3
J3402
COPILOT HEADSET AUDIO
OUT LEFT
4
J3402
COPILOT HEADSET AUDIO
OUT RIGHT
2
J3402
COPILOT HEADSET AUDIO
OUT LO
40
J3401
PASS HEADSET AUDIO
OUT LEFT
41
J3401
PASS HEADSET AUDIO
OUT RIGHT
42
J3401
PASS HEADSET AUDIO
OUT LO
4.5.9
Pin Name
Description
I/O
OUT
Pilot Headset Audio Output
OUT
-OUT
Copilot Headset Audio Output
OUT
-OUT
Passenger Headset Audio Output
OUT
--
Speaker Audio Out
Do not connect the LO of the speaker to the aircraft chassis. Two wires must be connected from the
GMA 342/345 to the Speaker for the HI and LO signals. If speaker LO is connected to the aircraft chassis
ground, the speaker will contain more noise than if connected back to the GMA 342/345 source
connections.
Table 4-15 Speaker Audio Output
Pin
Connector
43
J3402
44
J3402
190-01878-02
Rev. 3
Pin Name
Description
I/O
SPEAKER AUDIO OUT LO
Speaker Audio Output Ground
Reference
--
SPEAKER AUDIO OUT HI
Speaker Audio Output Hi
OUT
GMA 342/345 Installation Manual
Page 4-10
4.6 Discrete Inputs
The ICS KEYs are enabled by setting switch 1 of the DIP switch to ON. The COM Swap and Play key are
always enabled.
Table 4-16 Discrete Inputs
Pin
Connector
Pin Name
Description
I/O
16
J3401
PILOT ICS KEY*
Discrete Input
IN
13
J3402
PASSENGER ICS KEY*
Discrete Input
IN
20
J3402
COM SWAP*
Discrete Input
IN
22
J3402
PLAY KEY*
Discrete Input
IN
30
J3402
COPILOT ICS KEY*
Discrete Input
IN
*Denotes Active Low (Inputs: ground to activate)
4.6.1
Discrete Outputs
Table 4-17 Discrete Outputs
Pin
Connector
Pin Name
Description
I/O
24
J3401
COM ACTIVE* OUT
Discrete Out
OUT
12
J3402
PA MUTE* OUT
Discrete Out
OUT
19
J3402
PA MODE SELECTED*
Discrete Out
OUT
*Denotes Active Low (Grounded when active)
4.7 Marker Beacon
Marker lamp outputs provide a variable DC voltage between 3V and 9V that drive incandescent lamps
(>56Ω). Lamp brightness is controlled by the photocell.
MIDDLE MARKER SENSE OUT has the same behavior as MIDDLE MARKER LAMP OUT, but with
half the voltage output into the rated minimum resistance of 4.7 kΩ.
Table 4-18 Discrete Outputs
Pin
Connector
1
J3401
MARKER ANTENNA IN HI
IN
2
J3401
MARKER ANTENNA IN LO
--
36
J3401
INNER MARKER LAMP OUT
OUT
37
J3401
OUTER MARKER LAMP OUT
OUT
38
J3401
MIDDLE MARKER LAMP OUT
OUT
39
J3401
MIDDLE MARKER SENSE OUT
OUT
190-01878-02
Rev. 3
Pin Name
I/O
GMA 342/345 Installation Manual
Page 4-11
APPENDIX:A INSTALLATION CONSIDERATIONS FOR UPGRADING
FROM A GARMIN GMA 340
NOTE
This appendix contains installation considerations for upgrading from a Garmin
GMA 340. This is not a set of comprehensive installation instructions for installing a
Garmin GMA 342/345 in place of a Garmin GMA 340. Read this manual in its entirety
before starting any installation.
A.1 Mechanical Considerations
•
•
The GMA 340 installation rack is compatible with the GMA 342/345. Refer to Section 2.2 of this
manual for a list of installation materials.
The GMA 340 connectors are compatible and may be reused.
If replacing a GMA 340 with a GMA 342/345, the GMA 340 (330-00220-25) connector backshells can be
reused. However, grounding the wire shields to the GMA 342/345 will be easier with the Garmin
backshells in GPN 011-02302-00. The Garmin backshells also offer higher immunity to HIRF. Current
installations will not be required to change the backshell type, but would benefit from doing so.
A.2 Electrical Considerations
Figure A-1 shows the GMA 340 pins that may need to be modified to accommodate the GMA 342/345.
Refer to Section 4 and Appendix C of this manual for a list of pin functions and interconnect examples.
NOTE
If the GMA 340 installation to be replaced has three COM transceivers, the GMA 345
3-COM unit (Garmin PN 011-03520-20) should be used to accommodate the COM3
interface.
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Rev. 3
GMA 342/345 Installation Manual
Page A-1
A.3 GMA 340 to GMA 342/345 Retrofit Connections
GMA 340
GMA 340 RETROFIT NOTES
FOR INSTALLING GMA 342/345
GMA 342/345
GMA 340 RETROFIT NOTES
FOR INSTALLING GMA 342/345
J3401 P3401
J3401 P3401
COM 3 AUDIO IN HI
3
WIRED TEL AUDIO IN (GMA 342/345)/
COM 3 AUDIO IN (GMA 345 3-COM)
3
COM 3 AUDIO IN LO
4
WIRED TEL AUDIO LO (GMA 342/345)/
COM 3 AUDIO LO (GMA 345 3-COM)
4
COM 3 MIC AUDIO OUT HI
5
WIRED TEL MIC OUT (GMA 342/345)/
COM 3 MIC OUT (GMA 345 3-COM)
5
COM 3 MIC KEY* OUT
6
RESERVED (GMA 342/345)/
COM 3 MIC KEY* OUT (GMA 345 3-COM)
6
MASQ INHIBIT* IN
16
PILOT ICS KEY*
16
COM 3 SPKR LOAD IN HI
23
RCVR 5 AUDIO IN HI (AUX 3)
23
COM 3 SPKR LOAD IN LO
24
COM ACTIVE* OUT
24
COM 1 SPKR LOAD IN HI
25
RESERVED (GMA 342/345)/
WIRED TEL AUDIO IN HI (GMA 345 3-COM)
25
COM 1 SPKR LOAD IN LO
26
RESERVED (GMA 342/345)/
WIRED TEL AUDIO IN LO (GMA 345 3-COM)
26
COM 2 SPKR LOAD IN HI
27
RESERVED (GMA 342/345)/
WIRED TEL MIC OUT HI (GMA 345 3-COM)
27
COM 2 SPKR LOAD IN LO
28
RESERVED (GMA 342/345)/
WIRED TEL MIC OUT LO (GMA 345 3-COM)
28
NO CONNECT
29
ALERT 3 AUDIO IN HI
29
TEL RINGER AUDIO IN LO
43
ALERT 3, 4, AUX 3 AUDIO IN LO
43
TEL RINGER AUDIO IN HI
44
ALERT 4 AUDIO IN HI
44
GMA 342/345
GMA 340 RETROFIT NOTES
FOR INSTALLING GMA 342/345
GMA 340
GMA 340 RETROFIT NOTES
FOR INSTALLING GMA 342/345
J3402 P3402
J3402 P3402
ICS MUTE INHIBIT* IN
13
PASSENGER ICS KEY*
13
ICS MUTE INHIBIT RETURN
14
ALERT 2 LO, FAILSAFE AUDIO IN LO
14
HIGH GAIN MUSIC SELECT*
15
ALERT 2 AUDIO IN HI
15
8 OHM SELECT*
17
RESERVED
17
BUTTON PRESS TONE ENABLE*
19
PA MODE SELECTED*
19
NO CONNECT
22
PLAY KEY*
22
MUTE ON COM TX* IN
30
COPILOT ICS KEY*
30
Figure A-1 GMA 340 to GMA 342/345 Retrofit Connections
190-01878-02
Rev. 3
GMA 342/345 Installation Manual
Page A-2
APPENDIX B OUTLINE AND INSTALLATION DRAWINGS
6.30 160.0
3.1 79
.10 2.5
3.7 94
6.22 157.9
8.09 205.4
.200 5.08
100 CSK INSIDE RACK
(4 PLACES PER SIDE)
4.34 110.3
4X .025 0.64
1.30 33.0
1.28 32.4
.94 23.8
.60 15.2
.65 16.5
2X .35 8.9
.5 13
.44 11.1
3.49 88.6
5.16 131.1
Figure B-1 GMA 342/345 Outline Drawing
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page B-1
APPENDIX B OUTLINE AND INSTALLATION DRAWINGS
GMA 342/345 BACK PLATE
(ALSO USED ON GMA 240/340)
SUB-ASSEMBLY
011-00678-00
GMA 342/345 CONNECTOR KIT
(ALSO USED ON GMA 35/350)
011-02302-00
Figure B-2 GMA 342/345 Installation Drawing
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page B-2
APPENDIX B OUTLINE AND INSTALLATION DRAWINGS
OPTION 1:
STACK CUTOUT (RACK INSTALLED
FROM FRONT OF AIRCRAFT PANEL)
6.30 160.0
OPTION 2:
RADIO CUTOUT (RACK INSTALLED
FROM FRONT OF AIRCRAFT PANEL)
1.30 33.0
6.30 160.0
OPTION 3:
RADIO CUTOUT (RACK INSTALLED
FROM BACK OF AIRCRAFT PANEL
ONLY) MAXIMUM AIRCRAFT PANEL
THICKNESS IS .125 INCH [3.2 mm]
1.20 30.5
NOTES:
1. DIMENSIONS: INCH [mm]
2. IF THE FRONT LIP OF THE
MOUNTING RACK IS BEHIND
THE SURFACE OF THE AIRCRAFT
PANEL THE UNIT CONNECTORS
MAY NOT FULLY ENGAGE.
6.18 157.0
Figure B-3 GMA 342/345 Panel Cutout Drawing
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page B-3
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345 INSTALLATION NOTES
1.UNLESS OTHERWISE INDICATED, ALL SHIELDS MUST BE TERMINATED AT THE GMA END ONLY.
ALL SHIELDS ARE TIED TO THE SHIELD BLOCK OF THE BACKSHELL USING RING TERMINALS.
USE 190-00313-09 FOR GUIDANCE FOR SHIELD TERMINATIONS.
2. UNLESS OTHERWISE NOTED, ALL STRANDED WIRE MUST CONFORM TO MIL-W-22759/16 OR EQUIVALENT.
UNLESS OTHERWISE NOTED, ALL SHIELDED WIRE MUST CONFORM TO MIL-C-27500 OR EQUIVALENT.
3. UNLESS OTHERWISE NOTED, ALL WIRES ARE 22 AWG MINIMUM.
4. SYMBOL DESIGNATIONS AND CONNECTOR GUIDANCE:
WHT
SHIELDED 2 CONDUCTOR
BLU
WHT
BLU SHIELDED 3 CONDUCTOR
ORN
TWISTED SHIELDED 3 CONDUCTOR
SHIELD FLOATS
AIRCRAFT GROUND
SHIELD BLOCK GROUND
TWISTED SHIELDED 2 CONDUCTOR
SHIELD FLOATS
WIRE SPLICE
TWISTED SHIELDED 3 CONDUCTOR
SHIELD TERMINATED TO SHIELD BLOCK OF DSUB USING RING TERMINALS
MOMENTARY CONTACT
PUSH BUTTON
TWISTED SHIELDED 2 CONDUCTOR
SHIELD TERMINATED TO SHIELD BLOCK OF DSUB USING RING TERMINALS
TIP
SLEEVE
SLEEVE
TIP
MONO
PLUG
STEREO
PLUG
RING
NOTE 7
NOTE 18
TIP
STEREO PLUG
INSERTED INTO
JACK
RING
SLEEVE
MONO PLUG
INSERTED INTO
JACK
TIP
RING
SLEEVE
RING SHORTED
TO SLEEVE
NOTE 5. AUDIO JACK ISOLATION DIAGRAM
AUDIO
JACK
STEREO JACK
HEADSET EAR SPEAKER
FLAT METAL
WASHER
METAL
NUT
TIP (LEFT CHANNEL)
RING (RIGHT CHANNEL)
SLEEVE (LO)
NOTE 5
NOTE 7
JACK HEADSET MIC
SHOULDER
WASHER
FLAT INSULATED
WASHER
TIP (*PTT)
RING (MIC HI)
SLEEVE (MIC LO)
NOTE 5
NOTE 7
AIRCRAFT PANEL
5. ISOLATE JACK SLEEVE (MOUNTING NUT AND NUT PLATE) FROM AIRCRAFT CHASSIS.
ALL HEADSET, MICROPHONE, AND MUSIC PHONE JACKS MUST BE ELECTRICALLY ISOLATED FROM GROUND.
REFER TO THE FIGURE ABOVE FOR HOW THE JACK IS ISOLATED. NOT ISOLATING WILL CAUSE GROUND LOOPS AND NOISE.
6. THE CONNECTION BETWEEN PTT AND THE MIC JACK TIP IS REQUIRED IF HAND MICS WILL BE USED. *DENOTES AN ACTIVE LOW SIGNAL.
7. THE HEADSET EAR SPEAKER SLEEVE DIAMETER IS 0.25 INCH AND LARGER THAN THE HEADSET MIC SLEEVE DIAMETER 0.206 INCH.
8. IF THE TRANSCIEVER HAS A SEPARATE RETURN FOR AUDIO IN AND AUDO OUT, CONNECT BOTH TO THE GMA AUDIO LO AT THE GMA.
9. DO NOT CONNECT THE SPEAKER GROUND RETURN TO THE AIRCRAFT CHASSIS. THE GROUND RETURN MUST GO TO THE GMA.
10. THE LIGHTING BUS VOLTAGE RANGE IS CONFIGURABLE FOR EITHER 14 OR 28 VOLT SYSTEMS. REFER TO INSTALL MANUAL CONFIGURATION OPTIONS.
11. GARMIN RECOMMENDS USING STEREO HEADPHONES. IF MONO JACKS ARE DESIRED, GARMIN RECOMMENDS THE USE OF THE LEFT
OUTPUT ONLY (LEAVE THE RIGHT CHANNEL UNCONNECTED). DO NOT CONNECT THE LEFT AND RIGHT CHANNELS TOGETHER.
12. THE TELEPHONE INTERFACE MAY BE WIRED TO A FIXED MOUNTED TELEPHONE SOURCE (SHOWN) OR TO A SUITABLE JACK FOR
PORTABLE TELEPHONE.
13. TRANSCEIVER INTERFACES CAN ALSO BE WIRED THROUGH SUITABLE JACKS AND CABLES TO HANDHELD COMS THAT HAVE HEADSET
INTERFACE CAPABILITY. THE HANDHELD'S HEADSET OUTPUT (LEFT CHANNEL ONLY IF STEREO) CONNECTS TO THE GMA'S COM AUDIO
IN HI AND COM AUDIO LO PINS, THE HANDHELD'S MIC INPUT CONNECTS TO GMA'S COM MIC AUDIO OUT HI AND COM AUDIO LO PINS, AND
THE HANDHELD'S PTT KEY CONNECTS TO GMA'S COM MIC KEY* OUT. SEE TRANSCEIVER'S INSTRUCTION MANUAL.
14. * DENOTES ACTIVE LOW.
15. MONO ONLY HEADSET JACK CONNECTION DETAIL.
16. USE A MINIMUM 10 WATT SPEAKER.
USE 8 OHM SPEAKER FOR 28 VOLT SYSTEMS ONLY.
USE 4 OHM SPEAKER FOR 14 OR 28 VOLT SYSTEMS.
17. ICS KEY INPUTS ARE ALSO COMPATIBLE WITH TWO-STAGE PTT KEYS IN WHICH THE FIRST DETENT ACTIVATES THE ICS KEY AND THE
SECOND DETENT ACTIVATES THE TRANSCEIVER PTT (CREW ONLY) FOR THAT POSITION.
18. PLUGGING A MONORAIL HEADSET INTO A STEREO JACK SHORTS THE RIGHT CHANNEL OUTPUT TO GROUND. THIS WILL CAUSE EXCESS CURRENT TO BE
DRAWN. THIS WILL NOT DAMAGE THE GMA, BUT IS NOT RECOMMENDED. THE GMA WILL DETECT THE SHORTED CHANNEL AND SHUT THE AUDIO TO THE SHORTED
CHANNEL OFF TO PREVENT THE INTERNAL AMPLIFIER FROM DRIVING A SIGNAL INTO A SHORT.
19. THE MUSIC LO SIGNALS ARE NOT THE SAME REFERENCE AS OTHER GROUNDS. THE MUSIC LO SIGNALS ARE PART OF A DIFFERENTIAL PAIR WITH THE
RIGHT AND LEFT SIGNALS. IF THE MUSIC LO SIGNAL IS TIED TO A GROUND, THE MUSIC WILL CONTAIN NOISE, AND THE AUDIO QUALITY WILL BE DEGRADED.
20. USE RG400 FOR MARKER BEACON COAXIAL CABLE. THE RF MATING CONNECTION FOR THE ANTENNA (BNC, TNC, N) WILL DEPEND ON THE MARKER BEACON ANTENNA USED
FOR DSUB COAXIAL CABLE INSTALLATION GUIDELINES REFER TO MARKER INSTALLATION SECTION OF INSTALL MANUAL. AVOID SHARP CORNERS AND ROUTE AWAY FROM
HIGH CURRENT WIRING AND ANY TRANSMITTER CABLES.
Figure C-1 Notes for Example Interconnect Drawings
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page C-1
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345
J3401 P3401
COM 1 AUDIO IN HI
COM 1 AUDIO LO
9
10
COM 1 MIC AUDIO OUT HI
11
COM 1 MIC KEY* OUT
12
COM 2 AUDIO IN HI
COM 2 AUDIO LO
13
14
COM1
Transceiver
SEE NOTE 8
S
S
SEE NOTE 13
S
COM 2 MIC AUDIO OUT HI
15
COM 2 MIC KEY* OUT
30
SEE NOTE 8
S
TEL AUDIO IN HI
TEL AUDIO LO
SEE NOTE 13
COM 3 AUDIO IN HI
COM 3 AUDIO LO
TEL
SYSTEM
SEE NOTE 8
COM 3 MIC AUDIO OUT HI
5
COM 3 MIC KEY* OUT
6
COM3
Transceiver
SEE NOTE 13
SEE NOTE 12
TEl AUDIO IN HI
TEL AUDIO LO
17
18
25
26
S
NAV1 Radio
TEL MIC AUDIO OUT HI
S
NAV 2 AUDIO IN HI
NAV 2 AUDIO IN LO
SEE NOTE 8
S
(OR JACK TO MATCH
DESIRED PHONE)
5
S
NAV 1 AUDIO IN HI
NAV 1 AUDIO IN LO
3
4
S
3
4
S
TEL MIC AUDIO OUT HI
GMA 345 3-COM (011-03520-20) ONLY
COM 3 AND TEL WIRING DIFFERENCES
COM2
Transceiver
19
20
TEL MIC AUDIO OUT LO
NAV2 Radio
SEE NOTE 8
TEL
SYSTEM
(OR JACK TO MATCH
DESIRED PHONE)
27
28
SEE NOTE 12
S
S
AUX 1 AUDIO IN HI
AUX 1 AUDIO IN LO
21
22
AUX 1 Source
S
AUX 2 AUDIO IN HI
AUX 2 AUDIO IN LO
7
8
AUX 2 Source
S
ALERT 1 AUDIO IN HI
ALERT 1 AUDIO IN LO
31
32
Alert 1 Audio
NOTE: Pressing the
AUX1 button selects/
deselects the AUX1
and AUX3 receivers
S
ALERT 3 AUDIO IN HI
ALERT 3, 4, AUX 3 AUDIO LO
29
43
Alert 3 Audio
S
ALERT 4 AUDIO IN HI
ALERT 3, 4, AUX 3 AUDIO LO
44
Alert 4 Audio
S
AUX 3 AUDIO IN HI
ALERT 3, 4, AUX 3 AUDIO LO
23
AUX 3 Source
S
PILOT MIC AUDIO IN LO
PILOT MIC AUDIO IN HI
35
33
PILOT MIC KEY* IN
34
PASS HEADSET LO
PASS HEADSET RIGHT
PASS HEADSET LEFT
42
41
40
INNER MARKER LAMP OUT
OUTER MARKER LAMP OUT
MIDDLE MARKER LAMP OUT
36
37
38
MIDDLE MARKER SENSE OUT
SHIELD BLOCK GROUND
39
PILOT ICS KEY* IN
16
COM ACTIVE* OUT
24
ALTERNATE
PTT CONNECTION
S
PILOT PTT
PILOT PTT
SEE NOTE 5,6
SEE NOTES 5, 6
(up to 4 jacks,
wired in parallel)
SEE NOTE 5
S
EXT INDICATOR
FLIGHT CONTROL
SYSTEM
S
SEE NOTE 14
Inhibit Input of
Applicable
Audio Source
MARKER BEACON ANTENNA
MARKER ANTENNA HIGH
MARKER ANTENNA LO
1
2
SEE NOTE 20
NO CONNECT PINS 6,25,26,27,28
Figure C-2 J3401 Connector Example Interconnect Drawing
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page C-2
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345
J3402 P3402
PILOT HEADSET LO
PILOT HEADSET RIGHT
PILOT HEADSET LEFT
1
31
16
SEE NOTE 5
S
COPILOT HEADSET LO
COPILOT HEADSET RIGHT
COPILOT HEADSET LEFT
2
4
3
SEE NOTE 5
S
COPILOT MIC AUDIO IN LO
COPILOT MIC AUDIO IN HI
34
32
SEE NOTE 5
ALTERNATE
PTT CONNECTION
S
COPILOT PTT
COPILOT MIC KEY* IN
33
PASS 1 MIC AUDIO IN LO
PASS 1 MIC AUDIO IN HI
36
35
COPILOT PTT
SEE NOTE 5,6
SEE NOTE 5
SEE NOTES 5, 6
S
PASS 2 MIC AUDIO IN LO
PASS 2 MIC AUDIO IN HI
38
37
SEE NOTE 5
S
PASS 3 MIC AUDIO IN LO
PASS 3 MIC AUDIO IN HI
40
39
SEE NOTE 5
S
PASS 4 MIC AUDIIO IN LO
PASS 4 MIC AUDIIO IN HI
42
41
SEE NOTE 5
S
MUSIC 1 IN LO
MUSIC 1 IN RIGHT
MUSIC1 IN LEFT
25
24
23
MUSIC 2 IN LO
MUSIC 2 IN RIGHT
MUSIC 2 IN LEFT
28
27
26
SPEAKER AUDIIO OUT HI
SPEAKER AUDIO OUT LO
44
43
ALERT 2 AUDIO IN HI
ALERT 2, FAILSAFE AUDIO LO
15
14
SEE NOTE 5
SEE NOTE 19
S
SEE NOTE 5
SEE NOTE 19
S
Cabin Speaker
SEE NOTE 9,16
S
Alert 2 Audio
S
FAILSAFE WARN AUDIO IN HI
29
Failsafe Audio
S
PA MUTE* OUT
PA MODE SELECTED* OUT
12
19
LIGHTING BUS 14V HI/28V HI
7
LIGHTING BUS 14V HI/28V LO
6
LIGHTING BUS 14V LO/28V LO
5
Mute Trigger to EXT PA
SEE NOTE 10
PASSENGER ICS KEY* IN
13
COM SWAP* IN
20
PLAY KEY* IN
22
COPILOT ICS KEY* IN
30
REFER TO THE LIGHTING BUS WIRING DIAGRAM FOR WIRING OPTIONS.
SEE NOTE 14
USE 5 AMP BREAKER
AIRCRAFT POWER
AIRCRAFT POWER
8
9
POWER GROUND
POWER GROUND
10
11
GROUND
21
NO CONNECT
17
NO CONNECT
18
5A
Aircraft Power Bus
USE 22 AWG FOR POWER AND GROUND
SPARE GROUND
CAN BE USED FOR ANY GROUND RETURN EXCEPT POWER OR MUSIC.
DO NOT USE FOR POWER OR MUSIC GROUND.
Figure C-3 J3402 Connector Example Interconnect Drawing
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Revision 3
GMA 342/345 Installation Manual
Page C-3
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345
J3402 P3402
14 VOLT LIGHTING BUS
LIGHTING BUS 14V HI/28V HI
7
LIGHTING BUS 14V HI/28V LO
6
LIGHTING BUS 14V LO/28V LO
5
TO 14 VOLT LIGHTING BUS HI
TO 14 VOLT LIGHTING BUS LO
OR
28 VOLT LIGHTING BUS
LIGHTING BUS 14V HI/28V HI
7
LIGHTING BUS 14V HI/28V LO
6
LIGHTING BUS 14V LO/28V LO
5
TO 28 VOLT LIGHTING BUS HI
TO 28 VOLT LIGHTING BUS LO
IF NEITHER OF THE ABOVE LIGHTING BUS CONFIGURATIONS
ARE WIRED, THE UNIT WILL DEFAULT TO USE THE DISPLAY
PHOTOCELL FOR LIGHTING CONTROL
Figure C-4 Lighting Bus Example Interconnect Drawing
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Revision 3
GMA 342/345 Installation Manual
Page C-4
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345
MONO AUDIO CONNECTIONS
J3402 P3402
PILOT HEADSET LEFT
PILOT HEADSET LO
16
1
PILOT HEADSET RIGHT
31
COPILOT HEADSET LEFT
COPILOT HEADSET LO
3
2
COPILOT HEADSET RIGHT
4
MONO CONNECTIONS
S
PILOT HEADSET JACK
NOTE 5,15
NC
COPILOT HEADSET JACK
NOTE 5,15
S
NC
MONO AUDIO SOURCE
MUSIC 1 IN LEFT
MUSIC 1 IN LO
23
25
S
MUSIC 1 IN RIGHT
24
MONO AUDIO OUT HI
MONO AUDIO OUT LO
NC
MONO AUDIO SOURCE
MUSIC 2 IN LEFT
MUSIC 2 IN LO
26
28
MUSIC 2 IN RIGHT
27
MONO AUDIO OUT HI
MONO AUDIO OUT LO
S
NC
Figure C-5 Mono Audio Example Interconnect Drawing
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Revision 3
GMA 342/345 Installation Manual
Page C-5
APPENDIX C INTERCONNECT DRAWINGS
GMA 342/345
J3401 P3401
PASSENGER HEADSET
PARALLEL WIRING
UP TO 4 JACKS
NOTE 5
PASS HEADSET LO
PASS HEADSET RIGHT
PASS HEADSET LEFT
42
41
40
Figure C-6 Four Passenger Headset Wiring Example Interconnect Drawing
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page C-6
APPENDIX C INTERCONNECT DRAWINGS
GMA342/345 J3401 (NOT APPLICABLE TO 3-COM UNITS)
14
15
13
11
12
COM 2 MIC COM 2 AUDIO COM 2 AUDIO
AUDIO OUT HI
LO
IN HI
COM 1 MIC
KEY* OUT
9
10
COM 1 MIC COM 1 AUDIO COM 1 AUDIO
IN HI
LO
AUDIO OUT HI
8
7
6
5
4
3
2
1
RCVR 4
AUDIO IN LO
(AUX 2)
RCVR 4
AUDIO IN HI
(AUX 2)
RESERVED
XCVR 3 MIC
OUT HI
(WIRED TEL)
XCVR 3
AUDIO LO
(WIRED TEL)
XCVR 3
AUDIO IN
(WIRED TEL)
MARKER
ANTENNA LO
MARKER
ANTENNA HI
30
29
28
27
26
25
24
23
22
21
20
19
18
COM 2 MIC
KEY* OUT
ALERT 3
AUDIO IN HI
RESERVED
RESERVED
RESERVED
RESERVED
DISCRETE C
OUT* (COM
ACTIVE OUT)
RCVR 5
AUDIO IN HI
(AUX 3)
RCVR 3
AUDIO IN LO
(AUX 1)
RCVR 3
AUDIO IN HI
(AUX 1)
NAV 2 AUDIO
IN LO
NAV 2 AUDIO
IN HI
NAV 1 AUDIO
IN LO
44
43
42
41
40
39
38
ALERT 4
AUDIO IN HI
ALERT 3, 4,
AUX 3 AUDIO
IN LO
PASS
HEADSET
AUDIO OUT
LO
PASS
HEADSET
AUDIO OUT
RIGHT
PASS
HEADSET
AUDIO OUT
LEFT
MIDDLE
MARKER
SENSE OUT
MIDDLE
MARKER
LAMP OUT
37
35
36
OUTER
PILOT MIC
INNER MARKER
MARKER LAMP
LAMP OUT
AUDIO
IN LO
OUT
17
16
DISCRETE 1
NAV 1 AUDIO
INPUT* (PILOT
IN HI
ICS KEY)
34
33
32
31
PILOT MIC
KEY* IN
PILOT MIC
AUDIO IN HI
ALERT 1
AUDIO IN LO
ALERT 1
AUDIO IN HI
GMA342/345 J3402 (NOT APPLICABLE TO 3-COM UNITS)
14
15
13
ALERT 2 LO, DISCRETE 3 DISCRETE D
INPUT* (PASS
OUT* (PA
FAILSAFE
ICS KEY)
MUTE OUT)
AUDIO IN LO
ALERT 2
AUDIO IN HI
29
30
11
10
9
8
7
6
5
4
3
2
1
POWER
GROUND
POWER
GROUND
AIRCRAFT
POWER
AIRCRAFT
POWER
LIGHTING
BUS 14V
HI/28V HI
LIGHTING
BUS 14V
HI/28V LO
LIGHTING
BUS 14V
LO/28V LO
COPILOT
HEADSET
AUDIO OUT
RIGHT
COPILOT
HEADSET
AUDIO OUT
LEFT
COPILOT
HEADSET
AUDIO OUT
LO
PILOT
HEADSET
AUDIO OUT
LO
12
28
DISCRETE 6
FAILSAFE
INPUT*
WARN AUDIO MUSIC 2 IN LO
(COPIILOT ICS
IN HI
KEY)
27
26
MUSIC 2 IN
RIGHT
MUSIC 2 IN
LEFT
25
24
23
22
MUSIC 1 IN LO
MUSIC 1 IN
RIGHT
MUSIC 1 IN
LEFT
DISCRETE 5
INPUT* (PLAY
KEY)
21
20
19
GROUND
DISCRETE 4
INPUT* (COM
SWAP)
DISCRETE F
OUT* (PA
MODE
SELECTED)
44
43
42
41
40
39
38
37
36
35
SPEAKER
AUDIO OUT HI
SPEAKER
AUDIO OUT
LO
PASS 4 MIC
AUDIO IN LO
PASS 4 MIC
AUDIO IN HI
PASS 3 MIC
AUDIO IN LO
PASS 3 MIC
AUDIO IN HI
PASS 2 MIC
AUDIO IN LO
PASS 2 MIC
AUDIO IN HI
PASS 1 MIC
AUDIO IN LO
PASS 1 MIC
AUDIO IN HI
34
18
RESERVED
33
17
16
RESERVED
PILOT
HEADSET
AUDIO OUT
LEFT
32
COPILOT MIC COPILOT MIC COPILOT MIC
AUDIO IN HI
AUDIO IN LO
KEY* IN
31
PILOT
HEADSET
AUDIO OUT
RIGHT
Figure C-7 J3401 & J3402 Connector Layout Drawing (not applicable to 3-COM Units)
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page C-7
APPENDIX C INTERCONNECT DRAWINGS
GMA342/345 J3401 (3-COM UNIT ONLY)
14
15
13
11
12
COM 2 MIC COM 2 AUDIO COM 2 AUDIO
AUDIO OUT HI
LO
IN HI
COM 1 MIC
KEY* OUT
9
10
COM 1 MIC COM 1 AUDIO COM 1 AUDIO
LO
IN HI
AUDIO OUT HI
8
7
6
5
4
3
2
1
RCVR 4
AUDIO IN LO
(AUX 2)
RCVR 4
AUDIO IN HI
(AUX 2)
COM 3 MIC
KEY* OUT
COM 3
MIC OUT
COM 3
AUDIO LO
COM 3
AUDIO IN
MARKER
ANTENNA LO
MARKER
ANTENNA HI
30
29
28
27
26
25
24
23
22
21
20
19
18
COM 2 MIC
KEY* OUT
ALERT 3
AUDIO IN HI
WIRED TEL
MIC OUT LO
WIRED TEL
MIC OUT HI
WIRED TEL
AUDIO IN LO
WIRED TEL
AUDIO IN HI
DISCRETE C
OUT* (COM
ACTIVE OUT)
RCVR 5
AUDIO IN HI
(AUX 3)
RCVR 3
AUDIO IN LO
(AUX 1)
RCVR 3
AUDIO IN HI
(AUX 1)
NAV 2 AUDIO
IN LO
NAV 2 AUDIO
IN HI
NAV 1 AUDIO
IN LO
44
43
42
41
40
39
38
ALERT 4
AUDIO IN HI
ALERT 3, 4,
AUX 3 AUDIO
IN LO
PASS
HEADSET
AUDIO OUT
LO
PASS
HEADSET
AUDIO OUT
RIGHT
PASS
HEADSET
AUDIO OUT
LEFT
MIDDLE
MARKER
SENSE OUT
MIDDLE
MARKER
LAMP OUT
37
OUTER
PILOT MIC
INNER MARKER
MARKER LAMP
LAMP OUT
AUDIO
IN LO
OUT
16
DISCRETE 1
NAV 1 AUDIO
INPUT* (PILOT
IN HI
ICS KEY)
34
33
32
31
PILOT MIC
KEY* IN
PILOT MIC
AUDIO IN HI
ALERT 1
AUDIO IN LO
ALERT 1
AUDIO IN HI
35
36
17
GMA342/345 J3402 (3-COM UNIT ONLY)
14
15
13
ALERT 2 LO, DISCRETE 3 DISCRETE D
INPUT* (PASS
OUT* (PA
FAILSAFE
ICS KEY)
MUTE OUT)
AUDIO IN LO
ALERT 2
AUDIO IN HI
29
30
11
10
9
8
7
6
5
4
3
2
1
POWER
GROUND
POWER
GROUND
AIRCRAFT
POWER
AIRCRAFT
POWER
LIGHTING
BUS 14V
HI/28V HI
LIGHTING
BUS 14V
HI/28V LO
LIGHTING
BUS 14V
LO/28V LO
COPILOT
HEADSET
AUDIO OUT
RIGHT
COPILOT
HEADSET
AUDIO OUT
LEFT
COPILOT
HEADSET
AUDIO OUT
LO
PILOT
HEADSET
AUDIO OUT
LO
12
28
DISCRETE 6
FAILSAFE
INPUT*
WARN AUDIO MUSIC 2 IN LO
(COPIILOT ICS
IN HI
KEY)
27
26
MUSIC 2 IN
RIGHT
MUSIC 2 IN
LEFT
25
24
23
22
MUSIC 1 IN LO
MUSIC 1 IN
RIGHT
MUSIC 1 IN
LEFT
DISCRETE 5
INPUT* (PLAY
KEY)
21
20
19
GROUND
DISCRETE 4
INPUT* (COM
SWAP)
DISCRETE F
OUT* (PA
MODE
SELECTED)
44
43
42
41
40
39
38
37
36
35
SPEAKER
AUDIO OUT HI
SPEAKER
AUDIO OUT
LO
PASS 4 MIC
AUDIO IN LO
PASS 4 MIC
AUDIO IN HI
PASS 3 MIC
AUDIO IN LO
PASS 3 MIC
AUDIO IN HI
PASS 2 MIC
AUDIO IN LO
PASS 2 MIC
AUDIO IN HI
PASS 1 MIC
AUDIO IN LO
PASS 1 MIC
AUDIO IN HI
34
18
RESERVED
33
17
16
RESERVED
PILOT
HEADSET
AUDIO OUT
LEFT
32
COPILOT MIC COPILOT MIC COPILOT MIC
AUDIO IN HI
AUDIO IN LO
KEY* IN
31
PILOT
HEADSET
AUDIO OUT
RIGHT
Figure C-8 J3401 & J3402 Connector Layout Drawing for 3-COM units
190-01878-02
Revision 3
GMA 342/345 Installation Manual
Page C-8
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