Garmin GMA 345, GMA 342 Installation manual

GMA 342/345

Installation Manual

190-01878-02

November, 2020

Revision 5

© 2020

Garmin Ltd. or its subsidiaries All Rights Reserved

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1200 E. 151st Street

Olathe, KS 66062 USA

Aviation Panel-Mount Technical Support Line (Toll Free) 1.888.606.5482

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Garmin aviation support and warranty information can be found at www.flygarmin.com.
		RECORD OF REVISIONS
Revision	Revision Date	Description
1	01/17/17	Initial Release

209/18/17 Updated Transmitter Grant of Equipment Authorization info

304/05/18 Updated Post Installation Checkout Procedure, added 3-COM unit info

409/17/19 Added missing pin info to Table 4-2

511/25/20 Added RS-232 pin info

190-01878-02	GMA 342/345 Installation Manual
Rev. 5	Page A

CURRENT REVISION DESCRIPTION

	Revision	Page	Section	Description of Change
		Number	Number
		4-3	4.2.2	Added RS-232 pin info
	5	4-5	4.5	Added RS-232 pin info
		C-3, C-8,		Added RS-232 pin info to Figure C-3, Figure C-8, and
			Appdx C
		C-9		Figure C-9

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.

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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.

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TABLE OF CONTENTS

PARAGRAPH PAGE

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	RS-232.............................................................................................................................	4-5

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PARAGRAPH		PAGE
4.6	Audio Inputs/Outputs and Mic Keys	...............................................................................4-5
4.7	Discrete Inputs...............................................................................................................	4-12
4.8	Marker Beacon...............................................................................................................	4-12

Appendix 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

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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-COMversion of the GMA 345 (011-03520-20) is alsoavailable. For installationsthat require more than 2 COMs the recommended audio panel is the GMA 345 3-COM, GMA 350H, or GMA 350Hc.

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NOTE

Unless otherwise noted, information listed for the GMA 345 also applies to the GMA 345 3-COM version unit.

1.2.1Features Summary

Table 1-1 GMA 342/345 Features Summary

Feature

Bluetooth Transceiver USB Charge Port

3.5 mm 4-Conductor Jack Input

Tranceiver Channels

Receiver Inputs

Microphone Inputs

Microphone Keys

Music Inputs (rear connector)

Alert Inputs (unswitched) Speaker Output Headset Outputs Discrete Inputs Discrete Outputs Failsafe Channel Lighting Bus

SD Card Socket

8 Position DIP Switch

GMA 342	GMA 345	GMA 345 3-COM
None	1 - Not shared with Music 1 or Music 2
None		1

	1 - not shared with	None
	Music 1 or Music 2
	3 - COM 1, COM 2, TEL	4 - COM 1, COM 2,
		COM 3, TEL

5 - NAV 1, NAV 2, 5 - NAV 1, NAV 2, AUX 1, AUX 2, AUX 3* AUX 1, AUX 2,

AUX 3 **

6 - Pilot, Copilot, 4 Passenger

2 - Pilot, Copilot

2

4

1

3 - Pilot, Copilot, Passenger (passenger output can drive 4 headsets) 5 3

1 - Only Heard During Power Off Mode

1

1

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.

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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).

1.3.1Physical Characteristics

Table 1-2 Physical Characteristics GMA 342/345

Characteristic

Specification

Bezel Height

Bezel Width

Rack Height (Dimple to Dimple) Rack Width

Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells)

GMA 342/345 Weight (Unit Only)

GMA 342/345 Weight (Installed with rack, backplate, and connectors)

1.30 inches (33.0 mm)

6.30 inches (160.0 mm)

1.33 inches (34.0 mm)

6.30 inches (160.0 mm)

8.09 inches (205.0 mm)

1.10 lbs (0.49 kg)

1.78 lbs (0.81 kg)

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1.3.2Electrical Specifications

Table 1-3 Electrical Characteristics

Characteristic

Environmental

Compliance

Software

Compliance

Maximum Absolute

Audio Delay

Altitude

Maximum Days of

Continuous

Operation

Audio Panel

Functions

Intercom Functions

Headphone

Outputs

Specification

RTCA DO-160F

RTCA DO-178B Level D

The Input to Output delay is less than 1.1 ms for all audio I/O excluding entertainment audio (Music, Telephone, and Bluetooth)

55,000 Feet Overpressure - 15,000 Feet

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) 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 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% 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)

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Characteristic

Music Functions

Bluetooth

Connectivity GMA 345 only

USB Charge Port GMA 345 only

3.5 mm

Front Panel Jack GMA 342 only

Marker Beacon

Receiver

Table 1-3 Electrical Characteristics

Specification

Music inputs (stereo): 2

Music input impedance: 600 Ω (differential) Music gain: +24dB @ max. volume

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 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.

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

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Table 1-4 Speaker Output

	Aircraft Voltage	Speaker Impedance	Output Power
	14V	4 Ω	3 Watts
		8 Ω	Not Recommended
	28V	4 Ω	10 Watts
		8 Ω	7 Watts

1.3.3Power 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	Current Draw	Power Consumption
	Idle Current*	0.34 A @ 14 VDC	4.76 W @ 14 VDC
		0.19 A @ 28 VDC	5.32 W @ 28 VDC
	Typical Operating Current	0.83 A @ 14 VDC	11.62 W @ 14 VDC
		0.43 A @ 28 VDC	12.04 W @ 28 VDC
	Maximum Current	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

Idle Current*

Typical Operating Current without USB charge port being used.

Maximum Current with no USB charge port connection

Maximum Current with USB charge port connection

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
2.39 A @ 14 VDC	33.46 W @ 14 VDC
1.49 A @ 28 VDC	41.72 W @ 28 VDC

*Unit current drawn with power applied, no audio, and minimum lighting.

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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.

1.4.1TSO Compliance

Table 1-8 GMA 342/345 (011-03520-00 and 011-03520-10) TSO Compliance

		TSO/ETSO/		Applicable LRU	Applicable LRU
	Function		Category	Software Part	Boot Block Part
		RTCA/EUROCAE
				Numbers	Numbers
	AirborneRadioMarker	TSO-C35d	A
	Receiving Equipment	DO-143
				All	All
	Aircraft Audio
		TSO-C139a		006-B2227-0( )	006-B2227-B( )
	Systems and		Class Ib
		DO-214A
	Equipment

Table 1-9 GMA 345 (011-03520-20) TSO Compliance

		TSO/ETSO/		Applicable LRU	Applicable LRU
	Function		Category	Software Part	Boot Block Part
		RTCA/EUROCAE
				Numbers	Numbers
	AirborneRadioMarker	TSO-C35d	A	All
	Receiving Equipment	DO-143		006-B2227-0()
	Aircraft Audio			except	All
		TSO-C139a		006-B2227-00	006-B2227-B( )
	Systems and		Class Ib	and
		DO-214A
	Equipment			006-B2227-01

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1.4.2TSO 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.
	Garmin received a deviation from TSO-C35d to use FAR §45.15(b) instead of FAR
TSO-C35d	§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.

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1.4.3Transmitter 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

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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		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

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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 andreliabilityfromthe GMA 342/345. The guidance of FAA advisory circularsAC 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

2.2.1Unit Configurations

Table 2-1 Catalog Part Numbers

Model

GMA 342 Unit Only

GMA 342 Standard Kit (includes items in Table 2-2)

GMA 345 Unit Only

GMA 345 Standard (includes items in Table 2-3)

GMA 345 3-COM Unit Only

GMA 345 3-COM Standard (includes items in Table 2-3)

Catalog Part Number	Unit Only Part Number
010-01319-10	011-03520-10
010-01319-11	011-03520-10
010-01319-00	011-03520-00
010-01319-01	011-03520-00
010-01319-20	011-03520-20
010-01319-21	011-03520-20

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2.3 Available Accessories

2.3.1Standard 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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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

2.3.2Additional 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 GMA342/345 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 jacksor 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 (5Amp 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 GMA342/345 backshell. See 190-00313-09 for part numbers.

•Heat shrink tubing

•SD card needed for updating software in the GMA342/345. 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
190-01878-02	GMA 342/345 Installation Manual
Rev. 5	Page 2-3

2.4 Installation Considerations

The GMA342/345interfaces with variousavionics equipment. Fabricationof a wiringharnessis required. Sound mechanical and electrical methods and practices are required for installation of the GMA342/345.

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.

2.4.1Auxiliary 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).

190-01878-02	GMA 342/345 Installation Manual
Rev. 5	Page 2-4