Garmin GDU 37X Installation Manual
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Garmin GDU 37X Installation Manual

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GDU 37X

Installation Manual

190-01054-01
March, 2011
Revision C

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Summary of Contents for Garmin GDU 37X

  • Page 1: Installation Manual

    GDU 37X Installation Manual 190-01054-01 March, 2011 Revision C...
  • 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...
  • Page 3 NOTE References to the GDU 37X throughout this manual apply equally to the GDU 370 and GDU 375 except where specifically noted. 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...

  • Page 4: Table Of Contents

    TABLE OF CONTENTS PARAGRAPH PAGE Section 1 GDU 37X Installation Overview ............1-1 Unpacking Unit ........................... 1-1 Introduction ............................1-1 System Overview..........................1-1 General GDU 37X LRU Specifications ....................1-2 Garmin LRU Part Numbers ......................1-2 Power Specifications........................1-2 Physical Specifications ......................... 1-2 Cooling Requirements ........................

  • Page 5: Paragraph Page

    XM Activation Instructions (GDU 375 only) ................... 4-14 Section 5 Post-Installation Checkout Procedure..........5-1 Required Test Equipment ........................5-1 GDU 37X Test Procedure ........................5-1 Appendix A GDU 37X Pinouts ................ A-1 GDU 37X ..........................A-1 P3701 Connector...........................A-1 Aircraft Power..........................A-2 Demo Mode Selection........................A-2...
  • Page 6 Daisy Chain between Methods A and B ..................B-11 Double-Shield Termination Technique - Method C.1 ..............B-12 Double-Shield Termination Technique (Quick Term) - Method C.2 .........B-13 ID Program Pins (Strapping) ......................B-13 Splicing Signal Wires .........................B-14 Page iv GDU 37X Installation Manual Revision C 190-01054-01...
  • Page 7 LIST OF FIGURES FIGURE PAGE Section 1 GDU 37X Installation Overview ............1-1 Coax Cable Installation......................1-5 Section 2 GDU 37X .....................2-1 GDU 37X ..........................2-1 GDU 37X Mounting Accessories ..................2-4 GDU 37X Panel Cutout Template ..................2-6 Section 3 Garmin GPS/XM Antennas...............3-1 Recommended Antenna Placement ..................
  • Page 8 FIGURE PAGE Appendix A GDU 37X Pinouts ................ A-1 View of J3701 Connector from Back of Unit ..............A-1 Appendix B Connector Installation Instructions..........B-1 Shield Install onto a Jackscrew Backshell (78 pin example) ..........B-2 Method A.1 for Shield Termination..................B-3 Insulation/Contact Clearance ....................
  • Page 9 LIST OF TABLES TABLE PAGE Section 1 GDU 37X Installation Overview ............1-1 GDU 37X LRU Part Numbers ....................1-2 Contents of GDU 37X Assembly (010-00667-XX)............... 1-2 GDU 37X LRU Power Requirements..................1-2 GDU 37X LRU Physical Specifications ................1-2 Pin Contact and Crimp Tools Part Numbers................

  • Page 10: Limited Warranty

    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 11: Section 1 Gdu 37X Installation Overview

    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 12: General Gdu 37X Lru Specifications

    GDU 370 Atlantic DB 011-01747-20 010-00667-20 GDU 370 Pacific DB 011-01747-35 010-00667-35 GDU 375 Americas DB 011-01747-30 010-00667-25 Table 1-2 Contents of GDU 37X Assembly (010-00667-XX) Item Garmin P/N Quantity GDU 37X 011-01747-XX GDU 37X Connector Kit 011-01921-00 GDU 37X Nutplate...

  • Page 13: Cooling Requirements

    1.4.4 Cooling Requirements While no forced cooling air is required for the GDU 37X, it is highly recommended that the air behind the panel be kept moving (by ventilation or a fan). NOTE Avoid installing the GDU 37X LRUs near heat sources. If this is not possible, ensure that additional cooling is provided.

  • Page 14: Cable Location Considerations

    NOTES 1.Insertion/Extraction tools from ITT Cannon are all plastic; others are plastic with metal tip. 2.Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice. 1.6.2 Cable Location Considerations Use cable meeting the applicable aviation regulation for the interconnect wiring. Any cable meeting specifications is acceptable for the installation.

  • Page 15: Cable Installation

    Table 1-5 list contact part numbers (for reference) and recommended crimp tools. 1.6.4 Backshell Assemblies Connector kits include backshell assemblies. Garmin’s backshell connectors give the installer the ability to quickly and easily terminate shield grounds at the backshell housing. The instructions needed to assemble the backshell connector w/Shield Block grounding system are located in Appendix B.
  • Page 16 This page intentionally left blank Page 1-6 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 17: Section 2 Gdu 37X

    The GDU 37X is not suitable for installation in a type-certificated aircraft. The GDU 37X is mounted flush to the aircraft instrument panel using four #6 screws. The GDU 37X is available in two models, GDU 370 and GDU 375. The GDU 370 is a Garmin Display Unit with a GPS receiver.

  • Page 18: Electrical Specifications

    9.5W, .675 Amp 15W, 0.540 Amp 9.25W, .330 Amp 2.2.3 GPS Specifications The GDU 37X uses a high-sensitivity GPS receiver that continuously tracks and uses up to 12 satellites to compute and update its position. Table 2-3 GDU 37X GPS Specifications...

  • Page 19: Antennas

    2.2.4 Antennas Table 2-4 lists Garmin and non-Garmin antennas currently supported by the GDU 37X. Refer to Section 3 for Garmin antenna installation information. For non-Garmin antennas, follow the manufacturer’s installation instructions. Table 2-4 GDU 37X Supported Antennas Mount Antenna...

  • Page 20: Installation Requirements

    Contact, Sckt, D-Sub, Crimp, Size 20 336-00094-00 *Included in GDU 37X Assembly (010-00667-XX) Table 1-1 2.4.2 Additional Equipment Required A 3/32” hex drive tool is required to secure the GDU 37X to the panel as described in Section 2.7 Unit Installation. CONNECTOR KIT 011-01921-00...

  • Page 21: Installation Considerations

    Refer to Appendix C for outline and installation drawings. 2.7 Unit Installation The GDU 37X is installed by holding the unit flush with the instrument panel and fastening the four captured 3/32” hex socket head screws to the panel as shown in Figure C-1.1 and C-1.2.

  • Page 22: Section 2 2-1 –

    5.57 in [141.4 mm] For corner holes, center punch and drill (#36) / tap (6/32) to create threaded holes drill out with 25 drill bit and use Garmin nut-plate P/N 115-01054-00 Figure 2-3 GDU 37X Panel Cutout Template Page 2-6...

  • Page 23: Gps Antennas

    GA 55/55A, GA 56, or GA 57X antennas, refer to this section. Garmin recommends the antennas shown in Tables 3-1 and 3-3. However, any equivalent GPS or XM antenna that meets the specifications listed in Tables 3-2 and 3-4 should work with the GDU 37X. 3.1 GPS Antennas...

  • Page 24: Antenna Mounting Considerations

    GPS receiver. However, placement of the GPS antenna relative to a COM transceiver and COM antenna, ELT antenna, and DF receiver antenna is critical. Use the following guidelines, in addition to others in this document, when locating the GDU 37X and its antennas.

  • Page 25: Gps/Xm Antenna Mounting Location

    VHF COM or the (re-radiating) ELT transmitter. NOTE The separation requirement does not apply to GPS and COM combination antennas, provided the antenna has been tested to meet Garmin’s minimum performance standards. The separating requirement includes the combination with an XM antenna element as well.

  • Page 26: Recommended Antenna Placement

    Figure 3-1 shows the recommended placement of antennas. Figure 3-1 Recommended Antenna Placement Page 3-4 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 27: Buried Antenna (Below The Skin Covering Or Glareshield) Mounting

    Modifications of this sort are not recom- mended or inferred by Garmin or the installation of the GDU 37X, and the installer should seek the guidance of the kit manufacture for such modifications.

  • Page 28: Antenna Doubler/Backing Plate

    To use an antenna in aircraft with fabric or composite skin, a ground plane is recommended. It is usually installed under the skin of the aircraft, below the antenna, and is made of either aluminum sheet or of wire mesh. Page 3-6 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 29: Antenna Grounding

    This section describes the structural mounting of the teardrop footprint antenna installation. An acceptable installation method is to use Garmin P/N: 115-00846-10 doubler plate with the GA 55 or GA 56 stud mount antennas. Another acceptable method is to fabricate and install one of three doublers (Figure 3-4, Figure 3-5, and Figure 3-6), depending on the thickness of the skin.

  • Page 30: Antenna Installation Instructions

    These sealants may damage the electrical connections to the antenna. Use of these type sealants may void the antenna warranty. 3.4.3 Reference Figures Figure 3-4 Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" Page 3-8 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 31: Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.049" To 0.051"

    Figure 3-5 Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" Figure 3-6 Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.051" to 0.063" GDU 37X Installation Manual Page 3-9 190-01054-01 Revision C...

  • Page 32: Sample Doubler Location, Teardrop Footprint Antenna, Metal Skin Aircraft

    Figure 3-7 Sample Doubler Location, Teardrop Footprint Antenna, Metal Skin Aircraft Figure 3-8 Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" Page 3-10 GDU 37X Installation Manual Revision C 190-01054-01...
  • Page 33 Figure 3-9 Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" Figure 3-10 Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.051" to 0.063" GDU 37X Installation Manual Page 3-11 190-01054-01 Revision C...
  • Page 34 Figure 3-11 Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" Figure 3-12 Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" Page 3-12 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 35: Arinc 743 Footprint Antenna Installation (Ga 55A, Ga 57X)

    This section describes the structural mounting of the ARINC 743 footprint antenna (GA 55A, GA 57X) installation. One acceptable method is to use Garmin P/N: 115-00846-00 doubler plate. Another acceptable method is to fabricate and install one of three doublers, Figure 3-14, Figure 3-15, or Figure 3-16, depending on the thickness of the skin.

  • Page 36: Preparation Of Doubler

    3.5.1 Preparation of Doubler 1. Use Garmin P/N: 115-00846-00, or refer to Table 3-6 for guidance on selecting the appropriate doubler drawing based on the thickness of skin at the antenna location. Make the doubler from 2024-T3 Aluminum (AMS-QQ-A-250/5), 0.063” sheet thickness.

  • Page 37: Reference Figures

    3.5.3 Reference Figures Figure 3-14 Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.032" to 0.049" GDU 37X Installation Manual Page 3-15 190-01054-01 Revision C...

  • Page 38: Doubler Design, Arinc 743 Footprint Antenna, Skin Thickness 0.049" To 0.051"

    Figure 3-15 Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.049" to 0.051" Page 3-16 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 39: Doubler Design, Arinc 743 Footprint Antenna, Skin Thickness 0.051" To 0.063"

    Figure 3-16 Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.051" to 0.063" GDU 37X Installation Manual Page 3-17 190-01054-01 Revision C...

  • Page 40: Sample Doubler Location, Arinc 743 Antenna, Metal Skin Aircraft

    Figure 3-17 Sample Doubler Location, ARINC 743 Antenna, Metal Skin Aircraft Figure 3-18 Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.032" to 0.049" Page 3-18 GDU 37X Installation Manual Revision C 190-01054-01...
  • Page 41 Figure 3-19 Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.049" to 0.051" Figure 3-20 Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.051" to 0.063" GDU 37X Installation Manual Page 3-19 190-01054-01 Revision C...
  • Page 42 Figure 3-21 Doubler Installation, ARINC 743 Footprint Antenna, SkinThickness 0.032" to 0.049" Figure 3-22 Doubler Installation, ARINC 743 Footprint Antenna, SkinThickness 0.049" to 0.051" Page 3-20 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 43: Doubler Installation, Arinc 743 Footprint, Skin Thickness 0.051" To 0.063"

    Figure 3-23 Doubler Installation, ARINC 743 Footprint, Skin Thickness 0.051" to 0.063" Figure 3-24 Installation of ARINC 743 Footprint Antenna GDU 37X Installation Manual Page 3-21 190-01054-01 Revision C...

  • Page 44: Non-Structural Mount Installation

    Locking nuts are required to secure the ARINC 743 antenna (locking nuts installed on doubler). Torque the four supplied #10-32 stainless steel screws (Garmin P/N: 211-60212-20, MS51958-67, or equivalent) evenly across all mounting screws.

  • Page 45: Considerations For Non-Structural Mounting

    Figure 3-26 shows an example of a bracket created to support an antenna mounted on the underside of the glare shield. Figure 3-27 shows the non-structural mounting of the antenna under the glareshield, with the bracket assembly shown in Figure 3-26. Figure 3-26 Example Bracket Antenna Mounting Under Glareshield GDU 37X Installation Manual Page 3-23 190-01054-01 Revision C...

  • Page 46: Example Non-Structural Antenna Mounting Under Glareshield

    Figure 3-27 Example Non-structural Antenna Mounting Under Glareshield Page 3-24 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 47: Non-Structural Installation To Airframe

    Teardrop or the ARINC 743 antenna. Figure 3-28 Example Teardrop Antenna Installation In Airframe Under Fabric Skin Figure 3-29 Example ARINC 743 Footprint In Airframe Under Fabric Skin GDU 37X Installation Manual Page 3-25 190-01054-01 Revision C...

  • Page 48: Example Non-Structural Antenna Mounting On Airframe

    (Section 3.6.1) antenna is used, with the antenna support bracket as the mounting surface. Follow the applicable gasketing and sealant instructions in Section 3.4.2 (Teardrop style) or Section 3.5.2 (ARINC 743 style). Figure 3-30 Example Non-structural Antenna Mounting On Airframe Page 3-26 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 49: Example Teardrop Footprint Antenna Mounting Under Fabric Skin

    Top of antenna at or above the center of the tube structure (Figure 3-31, top) 1.00 1.25 0.625 0.75 Top of antenna between the center and bottom of the tube structure (Figure 3-31, bottom) 1.00 11.5 1.25 14.3 GDU 37X Installation Manual Page 3-27 190-01054-01 Revision C...

  • Page 50: Section 3 3-1 –

    This page intentionally left blank Page 3-28 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 51: Section 4 Software, Configuration, Databases, And Xm Activation

    4 Software, Configuration, Databases, and XM Activation 4.1 Configuration Mode Some software loading and all configuration settings are performed in the configuration mode. To enter configuration mode, hold down the left-hand softkey (softkey #1) while powering on the GDU 37X. Softkey #1 4.2 Software/Audio Data Identification 4.2.1 LRU Software and Audio Data Version Identification...

  • Page 52: Software Loading Procedure

    4.3 Software Loading Procedure Software loading is performed in normal mode. See the Garmin website (www.garmin.com) for instructions on downloading and installing software. 4.3.1 GDU Software Loading Procedure 1. Power on the GDU in normal mode, then insert the properly formatted SD card into the SD card slot.

  • Page 53: Configuration

    4.4.1 Main Configuration Page The Main Configuration Page is used to display LRU (device) specific information such as Unit and System ID’s and Database information for the various databases used by the GDU 37X. This page has no user-selectable options.

  • Page 54: Acft Configuration Page

    2. Use the FMS Joystick to select the desired configurable item and make the desired change. Then press the ENT Key or use the FMS Joystick to select the next item. Press the FMS Joystick to move the cursor to the page selection menu when finished. Page 4-4 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 55: W/B (Weight/Balance) Configuration Page

    Main Menu W/B Page in normal mode. Weight/Balance may be used during pre-flight preparations to verify the weight and balance conditions of the aircraft. By entering the weight and arm values into the Aircraft window, the GDU 37X can calculate the total weight, moment, and center of gravity (CG).

  • Page 56: Units Configuration Page

    The Units Configuration Page allows selection of the desired displayed units for the listed items in the Units Configuration window. The various settings for Location Format, Map Datum, and Heading can be accessed in the Position Configuration window. See the GDU 37X Pilot’s Guide for a description of Location Format and Map Datum.

  • Page 57: Dspl (Display) Configuration Page

    2. Use the FMS Joystick to select the desired configurable item and make the desired change. Then press the ENT Key or use the FMS Joystick to select the next item. Press the FMS Joystick to move the cursor to the page selection menu when finished. GDU 37X Installation Manual Page 4-7 190-01054-01...
  • Page 58 Input Type–Sets the aircraft lighting bus voltage for either 12 or 24V input to match the aircraft lighting bus voltage. Time Constant–Adjusts the speed (in seconds), that the brightness level responds to changes in the input voltage level. Page 4-8 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 59: Sound Configuration Page

    Alert Output – If set to MONO + STEREO, alert tones and messages will be output on both the mono and stereo outputs. If set to MONO ONLY, alert tones and messages will be output only on the mono output. GDU 37X Installation Manual Page 4-9...

  • Page 60: Comm Configuration Page

    NMEA Out - Supports the output of standard NMEA 0183 version 3.01 data at a baud rate of 4800. Aviation In - The proprietary format used for input to the GDU 37X (baud rate of 9600) from an FAA certified Garmin panel mount unit. Allows the GDU 37X to display a Go To or route selected on the panel mount unit, which eliminates the need to enter the destination on both units.

  • Page 61: Garmin Database Updates

    • SD Card, 2 GB recommended (Garmin recommends SanDisk® or Toshiba brand) After the data has been copied to the SD card, perform the following steps: 1. Insert the SD card in the card slot of the GDU 37X to be updated. 2. Turn on the GDU 37X to be updated.
  • Page 62 5. When the update process is complete, the screen displays the database status. 6. Once the database(s) have been updated, the SD card can be removed from the unit 7. The unit must be restarted by pressing the Restart softkey. Page 4-12 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 63: Available Databases

    FBOs. Look up taxi services, plan an overnight, and choose fuel stops; plus find ground transportation, lodging, restaurants, local attractions, and more. This database is updated on a quarterly cycle, and has no expiration date. GDU 37X Installation Manual Page 4-13 190-01054-01...

  • Page 64: Section 4 4-1 –

    3. Hook up the aircraft to external power if available. The complete activation process may take 45-60 minutes or more, depending on the demand on the XM activation system. 4. Power on the avionics and allow the GDU 37X to power up. Do not power cycle the units during the activation process.

  • Page 65: Section 5 Post-Installation Checkout Procedure

    This section contains the post-installation checkout procedures which are recommended to be performed after installing the GDU 37X. It is assumed that the person performing the post-installation checks is familiar with the aircraft, has a working knowledge of typical avionics systems, and has experience using the test equipment defined in this section.

  • Page 66: Section 5 5-1 –

    1. Power on unit and use the FMS Joystick to select the XM Page. 2. Verify that the XM receiver is functioning correctly as indicated by the green signal strength bars. See Section 4.6 for XM Activation Instructions if needed. Page 5-2 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 67: Appendix A Gdu 37X Pinouts

    APPENDIX A GDU 37X Pinouts A.1 GDU 37X A.1.1 P3701 Connector PIN 17 PIN 1 PIN 33 PIN 18 Figure A-1 View of J3701 Connector from Back of Unit Pin Name MONO AUDIO OUT HI STEREO AUDIO OUT LO STEREO AUDIO OUT LEFT...

  • Page 68: Aircraft Power

    A.1.3 Demo Mode Selection Demo mode is for in-store demonstration use only, never ground pin 42 in an aircraft installation. PFD MODE 4 (P3701, Pin 42) DISPLAY MODE Open Ground DEMO Page A-2 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 69: Serial Data

    P3701 RS-232 IN 3 P3701 RS-232 OUT 3 P3701 A.1.5 Lighting The GDU 37X display and keys can be configured to track 28 VDC or 14 VDC lighting busses using these inputs. Pin Name Connector 14V LIGHTING BUS HI P3701...
  • Page 70 This page intentionally left blank Page A-4 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 71: Appendix B Connector Installation Instructions

    Tables B-1 and B-2 list the parts needed to install a Shield Block. Parts listed in Table B-1 are supplied in the GDU 37X Connector Kit (011-01921-00). Parts listed in Table B-2 are to be provided by the installer. Table B-1 Parts supplied for a Shield Block Installation (Figure B-1)

  • Page 72: Shield Install Onto A Jackscrew Backshell (78 Pin Example)

    Flat washer, Cad-plated Steel, #8, .032" thick, .174"ID, .375" NAS1149FN832P Silicon Fusion Tape NOTE In Figure B-1, “AR” denotes quantity “As Required” for the particular installation. Figure B-1 Shield Install onto a Jackscrew Backshell (78 pin example) Page B-2 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 73: Shield Termination Technique - Method A.1 (Standard

    For the following steps please refer to the drawings showing the installation of a Jackscrew Backshell. 1. The appropriate number of Jackscrew Backshells will be included in the particular LRU connector kit. Figure B-2 Method A.1 for Shield Termination Table B-3 Shielded Cable Preparations for Garmin Connectors Number Window Window...
  • Page 74 The number of individual strands in each braid bundle is not specified. (e.g. QQB575F36T062) NOTE Flat Braid as opposed to insulated wire is specified in order to allow continuing air worthiness by allowing for visual inspection of the conductor. Page B-4 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 75: Insulation/Contact Clearance

    Wire must be visible in the inspection hole after crimping and the insulation must be 1/64 – 1/32 inches from the end of the contact as shown in Figure B-3. Figure B-3 Insulation/Contact Clearance GDU 37X Installation Manual Page B-5 190-01054-01...
  • Page 76 (item 13). Warning: Placing the grooved side of the clamp across the cable bundle may risk damage to wires. 13. Attach the cover (item 14) to the backshell (item 1) using the two screws (item 15). Page B-6 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 77: Shield Termination Technique - Method A.2 (Daisy Chain

    (Figure B-4). All other restrictions and instructions for the shield termination technique set forth for Method A.1 are still applicable. NOTE The maximum length of the combined braids should be approximately 4 inches. Figure B-4 Method A.2 (Daisy Chain) for Shield Termination GDU 37X Installation Manual Page B-7 190-01054-01 Revision C...

  • Page 78: Shield Termination - Method B.1 (Quick Term

    The chosen size of solder sleeve must accommodate both the number of conductors present in the cable and the Flat Braid (item 4) to be attached. NOTE Reference Section B.1.2 for recommended solder sleeves and flat braid. The same recommendations are applicable to this technique. Page B-8 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 79: Method B.1 (Quick Term) For Shield Termination

    Table B-4 Shielded Cable Preparations – (Quick Term) Number of Pins Quick Term Quick Term Quick Term Backshell Size Std/HD Min (inches) Max (inches) Float (inches) 9/15 1.25 2.25 1.75 15/26 25/44 37/62 50/78 GDU 37X Installation Manual Page B-9 190-01054-01 Revision C...

  • Page 80: Shield Termination-Method B.2 (Daisy Chain-Quick Term

    (Figure B-6). All other restrictions and instructions for the shield termination technique set forth for Method B.1 are still applicable. NOTE The maximum length of the combined braids should be approximately 4 inches. Figure B-6 Method B.2 (Daisy Chain-Quick Term) for Shield Termination Page B-10 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 81: Daisy Chain Between Methods A And B

    Method A and B are still applicable. NOTE The maximum length of the combined braids should be approximately 4 inches. Figure B-7 Daisy Chain between Methods A and B GDU 37X Installation Manual Page B-11 190-01054-01 Revision C...

  • Page 82: Double-Shield Termination Technique - Method

    All other restrictions set forth for in Table B-5 are applicable. NOTE The maximum length of the braids should be approximately 4 inches. Figure B-8 Method C.1 Double-Shield Termination Table B-5 Shielded Cable Preparations for Garmin Connectors Number of Window Window...

  • Page 83: Double-Shield Termination Technique (Quick Term) - Method

    B.1.9 ID Program Pins (Strapping) NOTE The GDU 37X rear connector (J3701) is electrically isolated. For installations using programming pins, a ground pin must be tied to the connector shell. ID Program Pins provide a ground reference used by the hardware as a means of configuration for system identification.

  • Page 84: Splicing Signal Wires

    Splice part numbers: •Raychem D-436-36/37/38 •MIL Spec MIL-S-81824/1 This technique may be used with shield termination methods: A.1, A.2, B.1, B.2, C.1 and C.2. Figure B-10 D-Sub Spliced Signal Wire illustration Page B-14 GDU 37X Installation Manual Revision C 190-01054-01...

  • Page 85: Appendix C Outline And Installation Drawings

    7.25 184.2 CONN. 1.09 1.92 2.98 27.7 48.7 75.8 6.04 3.41 15.0 153.4 86.7 1.08 27.5 NOTES: DIMENSIONS: INCHES[MM] DIMENSIONS ARE SHOWN FOR REFERENCE ONLY. Figure C-1.1 GDU 37X Outline Drawing GDU 37X Installation Manual Page C-1 190-01054-01 Revision C...

  • Page 86: Gdu Panel Cutout Drawing

    2. DIMENSIONS SHOWN FOR REFERENCE ONLY. 1.24 31.5 CONNECTOR KIT 011-01921-00 3.58 3.58 45° 45° 91.1 91.1 3.67 3.67 93.1 93.1 GDU 37x UNIT 011-01747-( ) Figure C-1.2 GDU Panel Cutout Drawing GDU 37X Installation Manual Page C-2 190-01054-01 Revision C...

  • Page 87: Ga 55/55A Installation Drawing

    2.350 59.69 2X 3.300 83.82 .625 15.88 4X .220 5.59 MOUNTING CUTOUT 2.59 [65.8] MOUNTING CUTOUT BACKING PLATE NOTES: (ANTENNA OUTLINE) 1. DIMENSIONS: INCHES[mm] OUTLINE Figure C-2.1 GA 55/55A Installation Drawing GDU 37X Installation Manual Page C-3 190-01054-01 Revision C...

  • Page 88: Ga 56 Installation Drawing

    BNC CONNECTOR SIDE VIEW FRONT VIEW 3.00 76.2 2X 1.625 41.28 .813 20.64 .188 4.78 .625 15.88 2.59 [65.8] MOUNTING CUTOUT BACKING PLATE OUTLINE (ANTENNA OUTLINE) Figure C-2.2 GA 56 Installation Drawing GDU 37X Installation Manual Page C-4 190-01054-01 Revision C...

  • Page 89: Ga 57X Installation Drawing

    2.350 59.69 2X 3.300 83.82 .220 5.59 FABRICATE AND INSTALL DOUBLER PLATE AS REQUIRED TO COMPLY WITH APPLICABLE AIRWORTHINESS REGULATIONS MOUNTING CUTOUT NOTES: 1. DIMENSIONS: INCHES[mm] Figure C-2.3 GA 57X Installation Drawing GDU 37X Installation Manual Page C-5 190-01054-01 Revision C...

  • Page 90: Appendix D Interconnect Drawing (Example Only)

    Appendix D Interconnect Drawing (example only) Figure D-1.1 GDU 37X Interconnect Drawing GDU 37X Installation Manual Page D-1 190-01054-01 Revision C...

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