Garmin GMA 347 Installation Manual
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Garmin GMA 347 Installation Manual

Audio panel
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GMA 347
AUDIO PANEL
INSTALLATION
MANUAL
Garmin Ltd. or its subsidiaries
190-00325-01 Revision A
August 2005

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  • Page 1 GMA 347 AUDIO PANEL INSTALLATION MANUAL Garmin Ltd. or its subsidiaries 190-00325-01 Revision A August 2005...
  • Page 2 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...
  • Page 3 NOTE At the time of this edition, the current software version for the GMA 347 is 2.09. The software version and information in this document are subject to change without notice. Visit the Garmin web site (www.garmin.com) for current manual updates and supplemental information concerning the operation of this and other Garmin products.
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  • Page 5: Table Of Contents

    2.1 Introduction............................2-1 2.2 Wiring ..............................2-1 2.3 Cooling Air ............................2-1 2.4 Installation Materials .........................2-2 2.5 GMA 347 Wiring and Software Configuration Options..............2-3 2.6 Marker Beacon Antenna Installation ....................2-5 2.7 Installation Approval Considerations for Pressurized Aircraft............2-6 2.8 Electrical Noise..........................2-6 2.9 GMA 347 Mounting ..........................2-7 INSTALLATION PROCEDURE......................3-1...
  • Page 6 5.12 Valid Data Ranges ...........................5-10 APPENDIX A CERTIFICATION DOCUMENTS A.1 Airworthiness Approval........................A-1 A.2 Continued Airworthiness ........................A-1 A.3 Environmental Qualification Forms, GMA 347 Audio Panel ............A-3 APPENDIX B ASSEMBLY AND INSTALLATION DRAWINGS APPENDIX C INTERCONNECT DRAWINGS LIST OF ILLUSTRATIONS...
  • Page 7 B-2 GMA 347 Rack Dimensions (115-00427-00)................... B-3 B-3 GMA 347 Connector/Rack Assembly Drawing ................B-5 C-1 GMA 347 Power, Antenna and Speaker Interconnect Wiring Diagram........... C-1 C-2 Mic and Phone Jack Connections, Interconnect Wiring Diagram ............ C-3 C-3 Transceiver Analog Connections, Interconnect Wiring Diagram............. C-5 C-4 Discrete Lines, Interconnect Wiring Diagram ..................
  • Page 8 4-16 Music Inputs Pin Assignments, J3471 .....................4-12 4-17 Unswitched Audio Inputs Pin Assignments, J3471.................4-12 4-18 Telephone Inputs/Outputs Pin Assignments, J3471 ................4-12 4-19 AUX, DME and ADF Audio Pin Assignments, J3471..............4-13 4-20 Failsafe Audio Pin Assignments, J3471 ..................4-13 Page GMA 347 Installation Manual Revision A 190-00325-01...
  • Page 9 GMA 347 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification (Mod) Levels for the GMA 347 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.
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  • Page 11: General Description

    This manual presents mechanical and electrical installation requirements for installing the Garmin GMA 347 Audio Panel. The GMA 347 can be installed into a variety of airframes by means of an STC, TC or Field Approval. Each airframe installation may vary. Use only approved data for specific installation instructions in a particular aircraft.
  • Page 12 Refer to the GMA 347 Pilot’s Guide (190-00325-00) for complete system operation. The GMA 347 is FAA TSO approved to C50c and C35d Class A, and ETSO approved to C50c and 2C35d (pending). A marker beacon receiver with dual sensitivity and audio muting with automatic re- arming is included in the unit.

  • Page 13: Technical Specifications

    1.2.2 Interface Summary The following is an interface summary for the GMA 347. See Section 4 and Appendix C for connection details. • 3 Transceiver Inputs (Figure C-3) • 5 Receiver Inputs (Figure C-3) • 4 Unswitched Inputs (Figures C-3) •...
  • Page 14 Selectivity: 6 dB @ ±10 kHz min, 40 dB @ ±200 kHz max. Input impedance: 50 External lamp drive: 125 mA max each output Other outputs: Middle MKR sense Special functions: SmartMute marker audio muting Page 1-4 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 15: Certification

    1.4.1 TSO/ETSO Compliance The GMA 347 is FAA TSO approved to TSO-C50c, TSO-C35d Class A, ETSO-C50c (pending) and ETSO-2C35d (pending). For a list of ETSO deviations see the GMA 347 Declaration of Design and Performance, Garmin part number 190-00325-03. 1.4.2 TSO Deviations The following table provides a list of applicable TSO deviations for the GMA 347.

  • Page 16: Reference Documents

    Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.

  • Page 17: Installation Overview

    Cooling Air The GMA 347 does not have provisions for attaching cooling air and does not generate an excessive amount of heat during typical operations, however the thermal characteristics of the installation should always be assessed. An undesireable 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.

  • Page 18: Installation Materials

    Black 011-00807-20 010-00275-21 2.4.2 Equipment Available Each of the following accessories is provided separately or in kit form for the GMA 347. The installation kit includes the unit and the following hardware: Item Garmin P/N Sub Assy, Connector Kit, GMA 347...

  • Page 19: Gma 347 Wiring And Software Configuration Options

    GMA 347 Wiring and Software Configuration Options The GMA 347 can be configured in different ways for the flight crew. Consideration of options should be discussed with the end user(s) of the aircraft before wiring begins. While Section 4 and Appendix C contain connection details, the actual features employed or omitted are dependent on the wiring options and the Software configuration selected.
  • Page 20 In small aircraft, COM and Nav receiver interference is affected by both the distance between antennas and the tuned frequency separation. With transmit interlock activated in either the GMA 347 or the COM transceivers, Split COM operation between a flight crew of more than one pilot is affected.

  • Page 21: Marker Beacon Antenna Installation

    Avoid routing cables near power sources (e.g., 400 Hz generators, trim motors, etc.) or near power for fluorescent lighting. • Avoid routing cable near ADF antenna cable (allow at least a 12-inch separation). GMA 347 Installation Manual Page 2-5 190-00325-01 Revision A...

  • Page 22: Installation Approval Considerations For Pressurized Aircraft

    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. Page 2-6 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 23: Gma 347 Mounting

    EMI and provide protection from High-Intensity Radiation Fields (HIRF). The GMA 347 is mounted using it’s own system rack. Figure 2-1 shows the GMA 347 unit rack. front lobe of the unit touches the rack Slide the unit into the rack until the Insert a 3/32”...
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  • Page 25: Installation Procedure

    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.

  • Page 26: Recommended Crimp Tools

    615725 M81969/1-04 NOTES 1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice. 2. Extracting the #16, #18 and #20 contact 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.

  • Page 27: Backshell Assembly And D-Subminiature Connectors

    Shield Block ground kit. The term ‘D-Sub’ (D-Subminiature) connectors have a letter "D" physical shape. D-Sub refers only to the polarized shell that holds the contacts (pins or sockets) in place. Table 3-3 lists Garmin part numbers for the GMA 347 D-Sub Connectors and the Backshell Assembly. Table 3-3. Backshell Assembly (011-00812-00)
  • Page 28 3.5.1 Shield Block Assembly Procedure The parts for the connector and backshell assembly, GMA 347 installations, are listed in Table 3-3 and shown in Figure 3-1. Figure 3-1. Shield Block Install onto Backshell Connector Assembly Table 3-4. Shield Block Components...

  • Page 29: Shielded Cable Preparation

    1. Attach the Shield Block(s) (2) to the backshell (1) by inserting the flathead screws (3) through the holes on the Shield Block and threading into the tapped holes on the backshell (1). (See Figure 3-1). The appropriate number of Shield Block kits is included in the GMA 347 connector kit. Table 3-5. Shielded Cable Preparation...
  • Page 30 The chosen size of heat shrinkage tubing must accommodate both the number of conductors present in the cable and the Flat Braid (6) to be attached. Page 3-6 GMA 347 Installation Manual Revision A 190-00325-01...
  • Page 31 In rare situations where more braids need to be terminated for this connector than three per ring terminal it is allowable to daisy chain a maximum of two shields together before coming to the ring terminal. (See Figure 3-3). GMA 347 Installation Manual Page 3-7 190-00325-01...
  • Page 32 (15). Warning: Placing the grooved side of the strain relief across the cable bundle may risk damage to wires. 13. Attach the cover (16) to the backshell (1) using two screws (17). Figure 3-4: Parallel Shield Termination Page 3-8 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 33: Configuration Module Kit – 011-00979-00

    Table 3-6. Configuration Module Kit – 011-00979-00 Item Description Garmin P/N Configuration Module PCB Board Assembly w/EEPROM 012-00605-00 Cable 4-Conductor Harness 325-00122-00 Crimp Pins #22 AWG (HD) 336-00021-00 Spacer Spacer, Config Module 213-00043-00 GMA 347 Installation Manual Page 3-9 190-00325-01 Revision A...
  • Page 34 4. Plug the four-conductor wire harness (3) into the connector on the PCB Board (1). 5. Insert into the backshell (6) recess, PCB Board (1) with pad (2) in position. 6. Attach cover (7) to backshell (6) using screws (8). Figure 3-5. Configuration Module Installation Page 3-10 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 35: Circuit Breaker Placard

    3. Mount the unit rack to a suitable mounting location on the panel using the provided nutplates. 4. Assemble the rear plate into the GMA 347 unit rack. 5. Insert the GMA 347 into the rack, noting proper orientation as shown on the installation drawing in Appendix B.
  • Page 36 (between 1/2 and 2 seconds). Confirm the operation of the GMA 347 internal LED annunciators and marker beacon LED’s. Cover the photocell with a finger and observe that the LED annunciators dim automatically. Check the front panel key backlighting and dimming function.
  • Page 37 NOTE If a monaural headset is plugged into any stereo phone jack position, no damage will occur to the GMA 347. In the case of plugging a monaural headset into any passenger position, any stereo listener will lose one channel when another passenger plugs in a monaural headset.
  • Page 38 (OM) position initially using HI sensitivity. When the OM audio is just barely audible in the headset, switching to LO sensitivity should reduce or eliminate the audio. This completes the in-aircraft post installation checkout. Page 3-14 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 39: System Interconnects

    Connector Description The GMA 347 has two 78-pin connectors located at the rear of the unit designated P3471 and P3472. P3471 and P3472 are clearly marked on the back of the rack. P3471 and P3472 pins are configured as...

  • Page 40: J3471 Pin Assignments

    CROSS-SIDE COM MIC AUDIO OUT HI CROSS-SIDE COM MIC KEY* CROSS-SIDE NAV AUDIO IN LO ADF AUDIO IN HI ADF AUDIO IN LO MUSIC IN 1 LO * Denotes Active Low (Ground to activate). Page 4-2 GMA 347 Installation Manual Revision A 190-00325-01...
  • Page 41 RESERVED RESERVED AUX AUDIO IN HI AUX AUDIO IN LO MUSIC IN 2 LO COM 3 MIC AUDIO OUT HI COM 3 MIC KEY* * Denotes Active Low (Ground to activate). GMA 347 Installation Manual Page 4-3 190-00325-01 Revision A...

  • Page 42: J3472 Pin Assignments

    RECORDER OFF SELECT* PROGRAM GROUND AUX SOURCE SELECT* RESERVED RESERVED RESERVED AIRCRAFT POWER 2 RESERVED AIRCRAFT POWER 2 RESERVED MIDDLE MARKER SENSE RESERVED RESERVED GROUND RETURN * Denotes Active Low (Ground to activate). Page 4-4 GMA 347 Installation Manual Revision A 190-00325-01...
  • Page 43 RESERVED POWER GROUND RESERVED RESERVED AIRWAY/INNER MARKER EXT LAMP OUT MIDDLE MARKER EXT LAMP OUT OUTER MARKER EXT LAMP OUT RESERVED MARKER ANTENNA HI * Denotes Active Low (Ground to activate). GMA 347 Installation Manual Page 4-5 190-00325-01 Revision A...

  • Page 44: J3472 Connector Pin Assignments

    POWER GROUND Aircraft ground 4.3.2 Lighting Bus The GMA 347 can be configured to track a 28 Vdc or 14 Vdc lighting bus using these inputs. Refer to Figure C-1 for lighting interconnections. Table 4-4. Aircraft Lighting Pin Assignments, J3472...
  • Page 45 RS-232 load. The RS-232 IN/OUT 1 connections are used to upload configuration data into the unit. The unit is configured out of the aircraft, before final installation. Refer to Section 5 for configuration instructions. Figure 4-3. GMA 347 Configuration Upload Connections GMA 347 Installation Manual Page 4-7...

  • Page 46: Marker Beacon Pin Assignments, J3472

    AUXILIARY SOURCE SELECT* ground to control the auxiliary audio. This input is for use with a cellular phone with a TEL DISCRETE RINGER* digital output. * Denotes Active Low (Ground to activate). Page 4-8 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 47: External Configuration Module Pin Assignments, J3472

    PA MUTE is an output that when pulled low is active. It is used to trigger the mute function on an external PA system. Table 4-10. PA MUTE Pin Assignments, J3472 Pin Name Description PA MUTE* OUT Output capable of sinking 500 mA * Denotes Active Low (Ground to activate). GMA 347 Installation Manual Page 4-9 190-00325-01 Revision A...

  • Page 48: J3471 Connector Pin Assignments

    Table 4-12. ICS Key Pin Assignments, J3471 Pin Name Description PILOT ICS KEY* COPILOT ICS KEY* Enables audio into the intercom system PASS ICS KEY* * Denotes Active Low (Ground to activate). Page 4-10 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 49: Com Audio And Mic Keys Pin Assignments, J3471

    COPILOT HEADSET AUDIO OUT LO Ground reference for copilot headset PASS HEADSET AUDIO OUT LEFT Passenger headset audio output PASS HEADSET AUDIO OUT RIGHT Ground reference for passenger PASS HEADSET AUDIO OUT LO headset GMA 347 Installation Manual Page 4-11 190-00325-01 Revision A...

  • Page 50: Music Inputs Pin Assignments, J3471

    Transmitted telephone audio output TEL MIC AUDIO OUT LO Ground reference for telephone Mic audio TEL AUDIO IN HI Received telephone audio input TEL AUDIO IN LO Ground reference for telephone input Page 4-12 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 51: Aux, Dme And Adf Audio Pin Assignments, J3471

    4.4.10 Failsafe Audio Table 4-20. Failsafe Audio Pin Assignments, J3471 Pin Name Description Audio summed to the pilots headset left FAIL SAFE WARN AUDIO IN and COM 1 when power fails GMA 347 Installation Manual Page 4-13 190-00325-01 Revision A...
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  • Page 53: Post Installation Configuration And Checkout Procedure

    The GMA Configuration Tool allows the ability to send updated configuration information and upload SYSTEM or BOOT BLOCK Hex file code to a GMA 347 via a PC’s RS-232 COM port. The application can also be used to query the GMA 347 for its current configuration information. Figure 5-2 shows the configurations that can be altered.

  • Page 54: Connect And Disconnect Buttons

    When the GMA Configuration Tool is first opened, all available COM ports will continuously be queried until a connection is made with a GMA 347 (Figure 5-3). All SET boxes will become editable and the product information will appear in place of the “No Connection” message once the initial connection is made.
  • Page 55 Connect button will replace the Disconnect button. After the Connect button is pressed the application will behave similarly to initial startup in that it will continuously try to connect to a GMA 347 on COM ports 1 – 10 until successful.

  • Page 56: Configuration Tool Settings

    “ACTIVE” in the unit 5.6.3 Configuration Options Each setting will have a SET value and an ACTIVE value shown on the GMA 347 Configuration Tool. The SET values can be altered. The ACTIVE values represent the value that the unit currently has stored.

  • Page 57: Marker Beacon

    MUTE AUDIO ON RX audio on the primary COM. Setting this option will record COM 2 audio on the voice recorder when RECORD COM2 the unit is in Split COM mode. GMA 347 Installation Manual Page 5-5 190-00325-01 Revision A...

  • Page 58: 5.10 Code Upload

    Figure 5-6 Wrong Hex File Selected (Selecting Boot Code for System Code Upload) If system code is selected for a boot block upload, Figure 5-7 will warn that the wrong hex file has been selected. Page 5-6 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 59: Erasing Flash

    Click No to resume the code upload. Click Yes to cancel the code upload. Figure 5-10 Canceling a Code Upload If the code upload is cancelled, Figure 5-11 will show that the code upload failed. GMA 347 Installation Manual Page 5-7 190-00325-01...

  • Page 60: Code Upload Failed

    If this failure occurs DO NOT turn the unit power off. Reselect the code to be uploaded and attempt the code upload again. Figure 5-11 Code Upload Failed When the code upload is finished, Figure 5-12 will appear to indicate code upload completion. Figure 5-12 Code Upload Complete Page 5-8 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 61: 5.11 Configuration Example

    5.11 Configuration Example hs_music1_vol=0 hs_music2_vol=0 hs_unswch1_vol=0 hs_unswch2_vol=0 hs_unswch3_vol=0 hs_altwarn_vol=0 spkr_crew_vol=0 mkr_vol=0 dsbl_spkr=0 pil_mic_vol=0 cop_mic_vol=0 master_sql_level=0 lo_sens_thrd=0 hi_sens_thrd=0 masq_inht=0 ics_mute=0 intl_sidetone=0 dsbl_play=0 dsbl_pa=0 mute_tx=0 mute_rx=0 dsbl_split_com=0 rec_com2=0 dsbl_com3=0 dsbl_tel=0 dsbl_dme=0 dsbl_adf=0 GMA 347 Installation Manual Page 5-9 190-00325-01 Revision A...

  • Page 62: 5.12 Valid Data Ranges

    Select to record COM 2 0 or 1 Disable COM3 annunciator 0 or 1 Disable TEL annunciator 0 or 1 Disable DME annunciator 0 or 1 Disable ADF annunciator 0 or 1 Page 5-10 GMA 347 Installation Manual Revision A 190-00325-01...

  • Page 63: Appendix Acertification Documents

    CERTIFICATION DOCUMENTS Airworthiness Approval Airworthiness approval of the GMA 347 may be acquired by the use of FAA Form 337. The following is provided as sample wording for Form 337, when replacing an existing audio panel with a Garmin GMA 347 Audio Panel. Modify appropriately for new installations.
  • Page 64 Refer to the GMA 347 Audio Panel Maintenance Manual. 7. Removal and Replacement Information Refer to Sections 2 and 3 of the GMA 347 Audio Panel Installation Manual. If the unit is removed and reinstalled, a functional check of the equipment should be conducted.

  • Page 65: A.3 Environmental Qualification Forms, Gma 347 Audio Panel

    12. Special Tools 13. This Section is for Commuter Category Aircraft Only A. Electrical loads: Refer to Sections 1 and 4 of the GMA 347 Audio Panel Installation Manual. B. Methods of balancing flight controls: N/A. C. Identification of primary and secondary structures: N/A.

  • Page 66: A-1 Gma 347 Environmental Qualification Form

    Figure A-1. GMA 347 Environmental Qualification Form (Sheet 1 of 3) Page A-4 GMA 347 Installation Manual Revision A 190-00325-01...
  • Page 67 Figure A-1. GMA 347 Environmental Qualification Form (Sheet 2 of 3) GMA 347 Installation Manual Page A-5 190-00325-01 Revision A...
  • Page 68 Figure A-1. GMA 347 Environmental Qualification Form (Sheet 3 of 3) Page A-6 GMA 347 Installation Manual Revision A 190-00325-01...

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