Garmin GMA 340 Manuel utilisateur

(GMA 340 and GMA 340 Dual ADF Shown)

Garmin International, Inc.

1200 E. 151st Street

Olathe, KS 66062 USA

190-00149-01 Revision L

June 2003

GMA 340 AUDIO PANEL

INSTALLATION MANUAL

(GMA 340, GMA 340H,

GMA 340 DUAL ADF)

Page A GMA 340 Installation Manual

Rev. L 190-00149-01

Garmin Ltd. or its subsidiaries

Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,

disseminated, downloaded or stored in any storage medium, for any purpose without 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 storage medium to be viewed and to

print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of

this manual or revision must contain the complete text of this copyright notice and provided further that

any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this document is subject to change without notice. Visit the Garmin web site

(www.garmin.com) for current updates and supplemental information concerning the operation of this and

other Garmin products.

Garmin International, Inc.

1200 E. 151st Street

Olathe, KS 66062 USA

Telephone: 913-397-8200

Aviation Panel-Mount Technical Support Line (Toll Free) 1-888-606-5482

Dealer Line: 1-800-800-1420

Web Site Address: www.garmin.com

Garmin (Europe) Ltd.

Unit 5, Quadrangle, Abbey Park Industrial Estate

Romsey, SO51 9DL, U.K.

Telephone: 44/1794.519944

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. A violation of the EAR may be subject to a penalty of up to 10

years imprisonment and a fine of up to US$1,000,000 under Section 2410 of the Export Administration

Act of 1979. Include this notice with any reproduced portion of this document.

RECORD OF REVISIONS

Revision Revision

Date

Description ECO #

A01/27/98 Preliminary Release -

B03/05/98 Add Music Trip Level Adjustment 8512

C02/03/99 Add Marker Sens Adjustment and Crimp Tool P/N 10404

D02/15/99 Add JTSO’s 10487

E05/28/99 Updated Document 11122

F05/26/00 Redraw 13446

G04/27/01 Add 340H P/N, STC, Mod 1 Normal/Split Com

Mode Connections, Helicopter PTT Switch

15687

H05/18/01 Added Dual ADF Version 15847

J12/18/01 Add mono/stereo failsafe note 17123

K06/24/02 Add 20 dB Music Volume Control and mod history 18443

L06/30/03 Add SB0213 and SB0221 21559

GMA 340 Installation Manual Page i

190-00149-01 Rev. L

TABLE OF CONTENTS

SECTION 1

GENERAL INFORMATION

PARAGRAPH PAGE

1.1 INTRODUCTION............................................................................................................................. 1-1

1.2 GENERAL DESCRIPTION ............................................................................................................. 1-1

1.3 SPECIFICATIONS ........................................................................................................................... 1-2

1.4 EQUIPMENT.................................................................................................................................... 1-3

1.5 INSTALLATION ACCESSORIES .................................................................................................. 1-3

1.6 ADDITIONAL EQUIPMENT REQUIRED..................................................................................... 1-4

1.7 LIMITED WARRANTY .................................................................................................................. 1-5

SECTION 2

INSTALLATION

2.1 INTRODUCTION............................................................................................................................. 2-1

2.2 UNPACKING AND INSPECTING EQUIPMENT.......................................................................... 2-1

2.3 ANTENNA INSTALLATION.......................................................................................................... 2-1

2.3.1 Location Considerations................................................................................................................. 2-1

2.3.2 Antenna Installation........................................................................................................................ 2-1

2.3.3 Antenna Cable Installation ............................................................................................................. 2-1

2.3.4 Installation Approval Considerations for Pressurized Aircraft ...................................................... 2-2

2.4 GMA 340 INSTALLATION............................................................................................................. 2-2

2.5 REAR CONNECTIONS ................................................................................................................... 2-3

2.5.1 Location.......................................................................................................................................... 2-3

2.5.2 Audio Shield Termination.............................................................................................................. 2-5

2.5.3 Noise............................................................................................................................................... 2-6

2.6 POST INSTALLATION CHECKOUT ............................................................................................ 2-6

2.6.1 Lamp Test....................................................................................................................................... 2-6

2.6.2 Failsafe Operation Check ............................................................................................................... 2-7

2.6.3 Transceiver Operational Check ...................................................................................................... 2-7

2.6.4 Intercom System (ICS) Check........................................................................................................ 2-7

2.6.5 Aircraft Receivers Check................................................................................................................ 2-8

2.6.6 Music System Check ...................................................................................................................... 2-8

2.7 ADJUSTMENTS ............................................................................................................................. 2-9

Page ii GMA 340 Installation Manual

Rev. L 190-00149-01

SECTION 3

OPERATION

PARAGRAPH PAGE

3.1 OPERATION .................................................................................................................................... 3-1

3.1.1 Front Panel Controls....................................................................................................................... 3-1

3.1.2 On, Off, and Failsafe Operation ..................................................................................................... 3-2

3.1.3 Lighting .......................................................................................................................................... 3-2

3.1.4 Transceivers ................................................................................................................................... 3-2

3.1.5 Split Com........................................................................................................................................ 3-3

3.1.6 Com Swap Function ....................................................................................................................... 3-3

3.1.7 Aircraft Radios & Navigation ........................................................................................................ 3-3

3.1.8 Speaker Output............................................................................................................................... 3-3

3.1.9 PA Function.................................................................................................................................... 3-4

3.1.10 Auxiliary Entertainment Inputs ...................................................................................................... 3-4

3.1.11 Intercom System (ICS) ................................................................................................................... 3-4

3.1.12 Mono/Stereo Headset ..................................................................................................................... 3-5

3.1.13 Marker Beacon Receiver ................................................................................................................ 3-6

APPENDIX A

CERTIFICATION DOCUMENTS

A.1 CONTINUED AIRWORTHINESS ................................................................................................. A-1

A.2 ENVIRONMENTAL QUALIFICATION FORM ........................................................................... A-4

APPENDIX B

INSTALLATION DRAWINGS

B.1 GENERAL ........................................................................................................................................B-1

APPENDIX C

STC PERMISSION

C.1 GENERAL ........................................................................................................................................C-1

GMA 340 Installation Manual Page iii

190-00149-01 Rev. L

LIST OF ILLUSTRATIONS

FIGURE PAGE

2-1 REAR CONNECTORS..................................................................................................................... 2-3

2-2 AUDIO SHIELD TERMINATION .................................................................................................. 2-5

2-3 ACCESS HOLE LOCATION........................................................................................................... 2-9

3-1 GMA 340 FRONT PANEL............................................................................................................... 3-1

B1 GMA 340 OUTLINE DRAWING ....................................................................................................B-3

B2 CONNECTOR/RACK KIT DRAWING ..........................................................................................B-5

B3 GMA 340 RECOMMENDED PANEL CUTOUT DIMENSIONS .................................................B-7

B4 J1 INTERCONNECT WIRING DIAGRAM ....................................................................................B-9

B5 J2 INTERCONNECT WIRING DIAGRAM ..................................................................................B-11

B6 J1 INTERCONNECT WIRING DIAGRAM ..................................................................................B-13

B7 J2 INTERCONNECT WIRING DIAGRAM ..................................................................................B-15

LIST OF TABLES

Table PAGE

2-1. J1 and J2 Pin Assignments ................................................................................................................ 2-4

2-2. Recommended Crimp tools ............................................................................................................... 2-5

Page iv GMA 340 Installation Manual

Rev. L 190-00149-01

GMA 340 HARDWARE MOD LEVEL HISTORY

The following table identifies hardware modification (Mod) Levels for the GMA 340 audio panel. Mod

Levels are listed with the associated service bulletin number, service bulletin date, and the purpose of the

modification. The table is current at the time of publication of this manual (see date on front cover) and is subject

to change without notice. Authorized Garmin Sales and Service Centers are encouraged to access the most up-to-

date bulletin and advisory information on the Garmin Dealer Resource web site at www.garmin.com using their

Garmin-provided user name and password.

MOD

LEVEL

SERVICE

BULLETIN

NUMBER

SERVICE

BULLETIN

DATE

PURPOSE OF MODIFICATION

1 0103 2-2-01 Configurable option to mute other com audios when

transmitting.

2 0113 6-13-01 Provides times ten gain (20 dB) for entertainment music

system.

3 0208B 5-17-02 Provides correct marker beacon output loading for interface

with a Sandel SN3308 EHSI.

4 0209 5-2-02 Provides failsafe operation when monophonic headsets are

used in a stereo installation.

5 0210 5-2-02 Provides switchable On/OFF times ten gain (20 dB) for

entertainment music system.

6 0212 7-16-02 Filter capacitors added to prevent power supply noise from

interfering with a GDL 49.

7 0213 8-26-02 Prevents current limiting resistors from becoming shorted to

the chassis.

8 0221 * Adds a failsafe warning audio to the GMA 340.

* Not released at time of publication.

GMA 340 Installation Manual Page 1-1

190-00149-01 Rev. L

SECTION 1

GENERAL INFORMATION

1.1 INTRODUCTION

This manual provides the installation and operating instructions for the Garmin GMA 340, GMA 340H and

GMA 340 Dual ADF Audio Panel. Reference to GMA 340 throughout this manual refers to all versions of the

unit. Information pertaining to the maintenance of the unit can be found in the GMA 340 Maintenance Manual,

P/N 190-00149-02. After installation of the GMA 340, FAA Form 337 must be completed by an appropriately

certificated agency to return the aircraft to service.

1.2 GENERAL DESCRIPTION

The Garmin GMA 340 Audio Panel meets the needs of aircraft owners and operators who require reliability and

versatility in the essential audio switching function. LED-illuminated push-button simplicity and intuitive panel

layout allow audio selection of both NAV and COM audio. Large, single-button activation of the COM

microphone and audio for up to three COM transceivers simplifies cockpit workload. Photocell dimming

circuitry automatically adjusts the brightness of the LEDs to a level appropriate for ambient cockpit light. A fail-

safe circuit connects the pilot’s headset and microphone directly to COM1 in the event that power is interrupted

or the unit is turned off. In the event of power loss a fail-safe warning audio will be heard.

Additionally, the GMA 340 includes a six-position intercom (ICS) with electronic cabin noise de-emphasis, two

stereo music inputs, and independent pilot, copilot, and passenger volume controls. To further simplify the

cockpit workload, the intercom provides three selectable modes of isolation. One hundred percent solid state

circuitry and extensive use of surface mount technology are employed. A pilot-selectable cabin speaker output

can be used to listen to the selected aircraft radios or to broadcast PA announcements. The PA function is pilot

selectable.

The GMA 340 is FAA TSO approved to C50c and C35d and JTSO approved to C50c and 2C35d. Also standard

is the marker beacon receiver with dual sensitivity and audio muting with automatic re-arming. 14V or 28V

operation, including the full rated range of headphone and speaker output power, is available without the

requirement for external voltage converters or dropping resistors. The GMA 340 is the standard version audio

panel as pictured on the cover of this manual. The GMA 340H is the helicopter version in which the pilot and co-

pilot control knobs on the front panel are reversed. The GMA 340 Dual ADF version, also pictured on the cover,

accepts two ADF audio inputs.

Features Summary:

•User-friendly, intuitive front panel layout

•LEDs indicate selected function

•Six position intercom: pilot, copilot, four passengers

•Three stereo headset amplifiers: one for pilot, one for copilot, and one for the passengers

•Two stereo music source inputs (one in Dual ADF version)

•Three selectable intercom operational modes

•Selectable aural pushbutton annunciation (beep) for the crew.

Page 1-2 GMA 340 Installation Manual

Rev. L 190-00149-01

•Independent pilot, copilot, and passenger volume controls

•Individual VOX circuits for each of six (6) mic inputs

•Automatic selection of radio audio source when corresponding mic is selected

•MASQTM Processing

•Split COM transceiver function. Copilot may transmit and receive on COM2 while pilot

transmits and receives on COM1

•COM swap function

•TX indication

•SmartMuteTM marker audio muting

•Speaker output for radios or PA function

•Power-off fail-safe to connect Pilot PTT, mic, and Headset to COM 1 if unit is turned off

•Power loss fail-safe warning audio

1.3 SPECIFICATIONS

SPECIFICATION CHARACTERISTIC

TSO Compliance TSO-C50c, C35d, JTSO-C50c, and JTSO-2C35d using DO-160C,

DO-170, and DO-143

Temperature Range -20°C to +55°C

Weight (Unit Only) 1.2 lbs. (0.6 kg)

(Installed with rack and connectors) 1.7 lbs. (0.8 kg)

Physical Dimensions: Bezel Height: 1.30 inches (33 mm)

Bezel Width: 6.29 inches (160 mm)

Rack Height (Dimple to Dimple): 1.33 inches (34 mm)

Rack Width: 6.30 inches (160 mm)

Depth Behind Panel with

Connectors (measured from

face of aircraft panel to rear

of connector backshells)

7.12 inches (181 mm)

Power Requirements Supply Voltage: 11.0 to 33.0 VDC; Operating Current: 2.2 A (normal

operation, 13.8 V, speaker on)

Altitude 50,000 Feet

Audio Panel Transceiver inputs: 3

Receiver inputs: 5 (6 in Dual ADF version)

Unswitched inputs: 2

Input impedance: 500ȍ(800ȍDME input in Dual ADF)

Input isolation: 60 dB minimum

Special functions: Fail-safe operation

MASQTM processing

GMA 340 Installation Manual Page 1-3

190-00149-01 Rev. L

SPECIFICATION CHARACTERISTIC

Intercom Positions: 6 (pilot, copilot, 4 passengers)

Volume controls: 3 (pilot, copilot, passengers)

VOX level controls: 2 (pilot, copilot/passengers)

VOX circuits: 6 (one per mic input)

Music inputs (stereo): 2 (1 in Dual ADF version) (one input mutable)

Music input impedance: 460 ohms minimum

Music input level: Less than 500 mVac RMS for full output (typical).

1 Vac RMS MAX (3 Vac p-p)

Microphone signal processing: 9 pole characteristic and special cabin

noise band de-emphasis

Intercom isolation modes: 3

Special functions: Configurable aural push-button annunciation for

the crew

Headphone Outputs Output amplifiers: 3, stereo (pilot, copilot, passengers)

Fidelity: Power into 150ȍDistortion

50 mW <0.5%

100 mW <5%

Frequency response: music; 100 Hz to 15 kHz nominal

Aircraft radio: 100 Hz to 6 kHz nominal

ICS mic: (Special cabin noise band de-emphasis)

Speaker Outputs Outputs selectable: 1, pilot selectable

Output power: 10 Watts into 4 or 8ȍ, @ any normal supply voltage.

Frequency response: 350 Hz to 6 kHz nominal

Special functions: PA Mode, pilot selectable, including split operation

Marker Beacon Receiver 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: 50ȍ

External lamp drive: 125 mA max each output

Other outputs: Middle MKR sense

Special functions: SmartMuteTM marker audio muting

1.4 EQUIPMENT

GMA 340 Audio Panel, Ship Level Assembly, P/N 010-00152-( ) includes the following, depending on part

number:

•011-00401-( )GMA 340 Unit Assembly (011-00401-10 replaces 011-00401-00)

•011-00652-00Connector Kit, GMA 340

•011-00678-00Rack Backplate, GMA 340

•115-00262-00SMP, Install Rack, GMA 340

(The installation kit is the same for the GMA 340, GMA 340H and GMA 340 Dual ADF)

1.5 INSTALLATION ACCESSORIES

•Marker beacon antenna kit (P/N 010-10175-00). [Note: A marker beacon antenna approved to

TSO C35( ) that has been installed to meet the requirements of this manual may be approved for

use with the GMA 340].

Page 1-4 GMA 340 Installation Manual

Rev. L 190-00149-01

1.6 ADDITIONAL EQUIPMENT REQUIRED

•Antenna sealant (use manufacturer’s instructions, install according to FAA AC 43.13-2A).

•Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams

are detailed in Appendix B.

•Hardware: #6-32 100°flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware

required to mount the installation rack is not provided.

•Stereo headphone jacks (up to 6), microphone jacks (up to 6), 3.5mm stereo jacks (up to 2), and

insulating washers for all.

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