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Garmin GDU 37X - page 1
190-01115-01 August, 2009 Revision A G3X Installation Manual ...
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Garmin GDU 37X - page 2
Page A G3X Installation Manual Revision A 190-01115-01 © Copyright 2009 Garmin Ltd. or its subsidiaries All Rights Reserved 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 ...
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Garmin GDU 37X - page 3
G3X Installation Manual Page i 190-01115-01 Revision A 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 ...
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Garmin GDU 37X - page 4
Page ii G3X Installation Manual Revision A 190-01115-01 TABLE OF CONTENTS PARAGRAPH PAGE 1 G3X Installation Overview .................................................................................................... .......... 1-1 1.1 Unpacking Unit .................................................................................................. ...
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Garmin GDU 37X - page 5
G3X Installation Manual Page iii 190-01115-01 Revision A PARAGRAPH PAGE 5 GTP 59 ....................................................................................................................... ...................... 5-1 5.1 Equipment Description................................................................................................. ...
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Garmin GDU 37X - page 6
Page iv G3X Installation Manual Revision A 190-01115-01 PARAGRAPH PAGE APPENDIX A: G3X Pinouts ....................................................................................................... ............ A-1 A.1 GDU 37X .................................................................................................................... ..... ...
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Garmin GDU 37X - page 7
G3X Installation Manual Page v 190-01115-01 Revision A LIST OF ILLUSTRATIONS FIGURE PAGE 1-1 G3X Interconnect Example ................................................................................................... ........... 1-2 1-2 Coaxial Cable Installation ..................................................................................... ...
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Garmin GDU 37X - page 8
Page vi G3X Installation Manu al Revision A 190-01115-01 FIGURE PAGE 6-26 Example Bracket Antenna Mounting Under Glareshield............................................................... 6-24 6-27 Example Non-structural Ante nna Mounting Under Glareshield .................................................... 6-25 6-28 Example Teardrop Antenna Insta ...
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Garmin GDU 37X - page 9
G3X Installation Manual Page vii 190-01115-01 Revision A FIGURE PAGE B-17 Insulation/Contact Clearance .............................................................................................. ......... B-23 B-18 Daisy Chain Shield Termination ............................................................................................ ..... B- ...
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Garmin GDU 37X - page 10
Page viii G3X Installation Manual Revision A 190-01115-01 LIST OF TABLES TABLE PAGE 1-1 G3X LRU Part Numbers ....................................................................................................... ........... 1-3 1-2 Contents of GDU 37X As sembly (010-00667-XX) ........................................................................ ...
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Garmin GDU 37X - page 11
G3X Installation Manual Page ix 190-01115-01 Revision A TABLE PAGE 6-4 XM Satellite Radio Antenn a Minimum Requirements .................................................................... 6-2 6-5 Teardrop Footprint Antenna Doubler Design and Installation ......................................................... 6-7 6-6 ARINC 743 Footprint Antenna ...
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Garmin GDU 37X - page 12
Page x G3X Installation Manual Revision A 190-01115-01 Limited Warranty for Garmi n GMU 44 and GTP 59 Products The Garmin products GMU 44 and GTP 59 are warrant ed to be fr ee from defects in materials or workmanship for two years from the date of purchase. W ithin this period, Garmin will at its sole option, repair or replace any components that f ...
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Garmin GDU 37X - page 13
G3X Installation Manual Page xi 190-01115-01 Revision A Limited Warranty for GSU 73 and GDU 37X Products The Garmin products GSU 73 and GDU 37X are warranted to be free from defects in materials or workmanship for one year from the date of purchase. W ithin this period, Garmin will at its sole option, repair or replace any components that fail in n ...
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Garmin GDU 37X - page 14
Page xii G3X Installation Manual Revision A 190-01115-01 GSU 73 HARDWARE MOD LEVE L HISTORY The following table identifies hardware modificati on (Mod) Levels for the GSU 73 LRU. Mod Levels are listed with the associated service bulletin numbe r, service bulletin date, and the purpose of the modification. The table is current at the time of publica ...
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Garmin GDU 37X - page 15
G3X Install ation Manual – I nstallati on Overview Page 1-1 190-01115-01 Revision A 1 G3X Installation Overview 1.1 Unpacking Unit Carefully unpack the equipment and make a visual in spection of the unit for evidence of damage incurred during shipment. If any component of the G3X system is damaged, notify the carrier and file a claim . To justify ...
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Garmin GDU 37X - page 16
Page 1-2 G3X Installation Manual –Installation Overview Revision A 190-01115-01 1.3 System Overview The G3X is an advanced technology avionics suite desi gned to integrate pilot/aircraft interaction into one central system. The system combines primary flight instrumentation, aircraft systems instrumentation, and navigational information, all disp ...
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Garmin GDU 37X - page 17
G3X Install ation Manual – I nstallation Overview Page 1-3 190-01115-01 Revision A 1.4 General G3X LRU Specifications 1.4.1 Garmin LRU Part Numbers Table 1-1. G3X LRU Part Numbers LRU Unit Only Part Number Assembly Part Number GDU 370 Americas DB 011-01747-15 010-00667-15 GDU 370 Atlantic DB 011-01747-20 010-00667-20 GDU 370 Pacific DB 011-01747- ...
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Garmin GDU 37X - page 18
Page 1-4 G3X Installation Manual –Installation Overview Revision A 190-01115-01 1.4.3 Physical Specifications All width, height, and depth m easurements are taken with unit rack (if applicable) and connectors. Table 1-4. G3X LRU Physical Specifications LRU Width Height Depth (GMU 44 Diameter, including flange*) Unit Weight Unit Weight w/Nutplate ...
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Garmin GDU 37X - page 19
G3X Install ation Manual – I nstallation Overview Page 1-5 190-01115-01 Revision A 1.5 Installation Requirements One GDU 37X assembly (listed in Table 1-1) is required, dependent upon cust omer’s desired database region. Each GDU 37X (010-00667-XX) comes with all equipment needed for installation. 1.5.1 Required Accessories The following kits a ...
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Garmin GDU 37X - page 20
Page 1-6 G3X Installation Manual –Installation Overview Revision A 190-01115-01 1.7.1 Wiring Harness Installation Allow adequate space for installation of cables and conn ectors. Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI in terference. Analog Input wires routed too close to spark plugs, plug wires, ...
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Garmin GDU 37X - page 21
G3X Install ation Manual – I nstallation Overview Page 1-7 190-01115-01 Revision A 1.7.2 Cable Location Considerations Use cable meeting the applicable aviation regulation for the interconnect wiring. Any cable meeting specifications is acceptable for the installation. Wh en routing cables, observe the following precautions: • All cable routing ...
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Garmin GDU 37X - page 22
Page 1-8 G3X Installation Manual –Installation Overview Revision A 190-01115-01 1.7.4 Backshell Assemblies Connector kits include backshell assemblies. The backshell assembly houses the configuration module and a thermocouple reference junction (if applicable, see Appendix D). Garmin’s backshell connectors give the installer the ability to quic ...
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Garmin GDU 37X - page 23
G3X Installat ion Man ual – G DU 37 X Page 2-1 190-01115-01 Revision A 2 GDU 37X Figure 2-1. GDU 37X Unit View 2.1 Equipment Description NOTE There is no TSO/ETSO applicable to the GDU G37X. The GDU 37X provides a central display and user interfa ce for the G3X system. The display is m ounted flush to the aircraft instrument panel using four #6 s ...
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Garmin GDU 37X - page 24
Page 2-2 G3X Installation Manual – GDU 37X Revision A 190-01115-01 2.1.2 Interface Summary The GDU 37X uses CAN and RS-232 communications in terfaces. The GDU 37X communicates with the following Garmin LRUs: • Other GDU 37X • GSU 73 • SL30 Nav/Comm Transceiver • SL40 Comm Transceiver • GNS 400/500 Series Units • GTX 327/330 Transponde ...
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Garmin GDU 37X - page 25
G3X Installat ion Man ual – G DU 37 X Page 2-3 190-01115-01 Revision A 2.2.4 Antennas Table 2-4 lists Garmin and non-Garmin antennas currently supported by the GDU 37X. Refer to Section 6 for Garmin antenna installation information. For non-Garm in antennas, follow the manufacturer’s installation instructions. NOTE Only a single GPS antenna is ...
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Garmin GDU 37X - page 26
Page 2-4 G3X Installation Manual – GDU 37X Revision A 190-01115-01 2.4 Installation Requirements 2.4.1 Accessories The GDU 37X Connector Kit is provided with the G DU 37X unit and is required to install t he unit (Figure 2-2). The GDU 37X Nutplate (115-01054-00) is also supplied with the unit to reinforc e the panel cutout in thin panel installat ...
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Garmin GDU 37X - page 27
G3X Installat ion Man ual – G DU 37 X Page 2-5 190-01115-01 Revision A 2.5 Installation Considerations Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are recommended for installation of the GDU 37X. Refer to Section 1.6 for wiring considerations and to Appendix A for pinouts. Connector kits incl ...
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Garmin GDU 37X - page 28
Page 2-6 G3X Installation Manual – GDU 37X Revision A 190-01115-01 2.9 Panel Cutout Template The below drawing can be used as a template when ma rking the panel for cutout. Dimensions below are to verify accuracy of printout only, see Figure C-1.2 for complete dimensions. GDU 37X PANEL CUTOUT TEMPLATE 5.57 in [141.4 mm] 7.33 in [186.2 mm] Cut out ...
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Garmin GDU 37X - page 29
G3X Installat ion Man ual – G M U 44 Page 3-1 190-01115-01 Revision A 3. GMU 44 Figure 3-1. GMU 44 Unit View 3.1 Equipment Description The Garmin GMU 44 Magnetometer is a rem ote mounted device that interfaces with a Garmin GSU 73 to provide flight attitude and heading data for flight instrumentation. An Attitude and Heading Reference System comb ...
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Garmin GDU 37X - page 30
Page 3-2 G3X Installation Manual – GMU 44 Revision A 190-01115-01 3.3 Environmental Specifications Table 3-2 lists general environmental specifications. Table 3-2. GMU 44 Envir onmental Specification s Specification Characteristic Regulatory Compliance RTCA/DO-160D Environmental Conditions and EUROCAE/ED-14D Unit Software RTCA/DO-178B Level B Ope ...
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Garmin GDU 37X - page 31
G3X Installat ion Man ual – G M U 44 Page 3-3 190-01115-01 Revision A 3.5 Installation Requirements 3.5.1 Equipment Available Table 3-5. GMU 44 Part N umbers Model Catalog Part Number Unit Part Number Installation Rack GMU 44 010-00296-10* 011-00870-10 No *Included in G3X LRU Kit (K10-00016-00) Table 3-6. GMU 44 Acces sories Item Garmin P/N Quant ...
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Garmin GDU 37X - page 32
Page 3-4 G3X Installation Manual – GMU 44 Revision A 190-01115-01 Table 3-7. Required Distan ce from Mag netic Disturbances Disturbance Source Minimum Distance from GMU 44 Electric motors and relays, including servo motors 10 feet (3.0 meters) Ferromagnetic structure greater than 1 kg total (iron, steel, or cobalt materials, especially landin g g ...
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Garmin GDU 37X - page 33
G3X Installat ion Man ual – G M U 44 Page 3-5 190-01115-01 Revision A 3.6.1 Consideration for Wing Grounded Lighting Fixtures The following installation practices are recommende d if the required GMU 44 mounting bracket is located in the wing. 1. The wing tip lights should not have a power ground r eferenced to the chassis of the light assembly t ...
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Garmin GDU 37X - page 34
Page 3-6 G3X Installation Manual – GMU 44 Revision A 190-01115-01 3.8 Mounting Instructions After evaluation of the mounting location has been completed and ensuring that requirements are met, assemble the GMU 44 mounting plate kits according to th e dimensions given in Appendix C. Install the unit assemblies. Mount the GMU 44 to its mounting pla ...
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Garmin GDU 37X - page 35
G3X Installat ion Man ual – G SU 7 3 Page 4-1 190-01115-01 Revision A 4 GSU 73 4.1 Equipment Description NOTE There is no TSO/ETSO applicable to the GSU 73. The GSU 73 is intended for the LSA (light sport aircraft ) and experimental aircraft markets. The Garmin GSU 73 Sensor Unit is not a TSO-certified product an d has received no FAA approval or ...
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Garmin GDU 37X - page 36
Page 4-2 G3X Installation Manual – GSU 73 Revision A 190-01115-01 4.1.1 Features Summary Air Data Interfaces Pressure Altitude CAN (1) Density Altitude RS-232 (2 TX/2 RX) Vertical Speed ARINC 429 (4 RX/2 TX) Mach Number OAT Probe (GTP 59) Indicated Airspeed Magnetometer (GMU 44) (1 RS-232 TX/ 1 RS-485 RX) T r u e A i r s p e e d AHRS E n g i n e ...
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Garmin GDU 37X - page 37
G3X Installat ion Man ual – G SU 7 3 Page 4-3 190-01115-01 Revision A 4.3 Environmental Specifications The GSU 73 is a non-TSO’d product, Table 4-2 lists general environm ental specifications. NOTE The GSU 73 may require a warm-up pe riod of 15 minutes to reach full accuracy (30 minutes if the environmental temperature is less than 0°C). Table ...
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Garmin GDU 37X - page 38
Page 4-4 G3X Installation Manual – GSU 73 Revision A 190-01115-01 Table 4-5. Contents of P732 Connector Kit (011-01818-01)** Item Garmin P/N Quantity Sub-Assy,Backshell w/Hdw,Jackscrew 011-01855-04 1 Connector ,Hi Dens, D-Sub, Mil Crimp 78ck 330-00185-78 1 Contact Pin, Mil Crimp, Size 22D 336-00021-00 30 **Included in G3X Installation Kit (K10-00 ...
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Garmin GDU 37X - page 39
G3X Installat ion Man ual – G SU 7 3 Page 4-5 190-01115-01 Revision A 4.5.1 Pneumatic Plumbing The GSU 73 has two ports that are connected to the aircraft’s pitot pressure source and static pressure source. The two ports are labeled on the unit (see Fi gure 4-2). The pressure ports have 1/8-27 ANPT female threads. The mating fitting must have 1 ...
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Garmin GDU 37X - page 40
Page 4-6 G3X Installation Manual – GSU 73 Revision A 190-01115-01 4.6 Mounting Requirements Mount the GSU 73 with the connectors aligned within 1.0 deg of either the X or Y axis of the aircraft. The direction of the unit will be accounted for duri ng the calibration procedure as shown in Figure 4-3. Figure 4-3. GSU 73 Orientation Calibration The ...
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Garmin GDU 37X - page 41
G3X Installat ion Man ual – G SU 7 3 Page 4-7 190-01115-01 Revision A Do not use shock mounting to m ount the GSU 73. Shoc k mounts used for other types of inertial systems are not acceptable for the GSU 73 AHRS. The mounti ng system must have no resonance with the unit installed. Excessive vibration may result in degraded accuracy. The supportin ...
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Garmin GDU 37X - page 42
Page 4-8 G3X Installation Manual – GSU 73 Revision A 190-01115-01 4.8 Maintenance Per Part 43 Appendix E, paragraph (b)(2), Garm in sp ecifies a test procedure equivalent to part 43 Appendix E, paragraph (b)(1) with two exceptions. The tests of sub-paragraph (iv)(Friction) and (vi) (Barometric Scale Error) are not applicable because th e digital ...
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Garmin GDU 37X - page 43
G3X Installation M anual – GTP 59 Page 5-1 190-01115-01 Revision A 5 GTP 59 Figure 5-1. GTP 59 5.1 Equipment Description The Garmin GTP 59 is an outside mounted tem perature probe that provides raw air temperature data. The temperature input device is a three-wire temperature probe interface. OAT Power Out and OAT High are connected internally at ...
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Garmin GDU 37X - page 44
Page 5-2 G3X Installation M anual – GTP 59 Revision A 190-01115-01 5.2.1 Additional Equipment Required • Cables - The installer will supply all system cables. 5.3 TSO/ETSO Compliance The following table provides a list of applicable TSO/ETSOs for the GTP 59. Table 5-3. Applicable TSO/ETSOs for the GTP 59 Function TSO/ETSO Applicable LRU SW Part ...
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Garmin GDU 37X - page 45
G3X Installation M anual – GTP 59 Page 5-3 190-01115-01 Revision A 5.4 Installation Considerations 5.4.1 GTP 59 Icing The GTP 59 OAT probe has no icing protection. If ice accumulates on the GTP 59 OAT probe, its accuracy is unknown. Consequently, air temperature measurements may be incorrect if ice accumulates on the probe. Furthermore, computati ...
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Garmin GDU 37X - page 46
Page 5-4 G3X Installation M anual – GTP 59 Revision A 190-01115-01 5. Strip back 1/8” (0.125”) of insulation and crim p pins (11) to each of the conductors in the shielded cable. 6. Cut an AWG #16 (8) wire to 3” long. Strip back 0.5” of insulation from this cable. Connect the shield of the OAT Probe cable (3) to the AWG #16 wire (8). 7. A ...
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Garmin GDU 37X - page 47
G3X Installat ion Man ual – A nte nnas Page 6-1 190-01115-01 Revision A 6 Garmin GPS/XM Antennas For non-Garmin antennas, follow the manufacturer’s in stallation instructions. If using a Garmin GA 26C or GA 26XM, refer to the accompanying installati on instructions (190-00082- 00 or 190-00522-03). For GA 55/55A, or GA 56 or GA 57X antennas, ref ...
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Garmin GDU 37X - page 48
Page 6-2 G3X Installation Manual – An tennas Revision A 190-01115-01 Table 6-4. XM Satellite Radio Antenna Minimum Requirements Characteristics Specifications Frequency Range 2332.5 to 2345 MHz Gain (Typical) 24 dB* Noise Figure <1.2 dB Nominal Output Impedance 50 ohms Supply Voltage 3.6 to 5.5 VDC Supply Current (maximum ) 55 mA Operating Tem ...
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Garmin GDU 37X - page 49
G3X Installat ion Man ual – A nte nnas Page 6-3 190-01115-01 Revision A 6.3.2 GPS/XM Antenna Mounting Location The GPS antenna is a key element in the overall sy stem performance and integrity for a GPS navigation system. The mounting location, geometry, and surr oundings of the antenna can affect the system performance and/or availability. The f ...
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Garmin GDU 37X - page 50
Page 6-4 G3X Installation Manual – An tennas Revision A 190-01115-01 Figure 6-1 shows the recommended placement of antennas. 4 Figure 6-1. Recommended Antenna Placement ...
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Garmin GDU 37X - page 51
G3X Installat ion Man ual – A nte nnas Page 6-5 190-01115-01 Revision A 6.3.3 Buried Antenna (below the skin covering or gl areshield) Mounting There are potential performance issues related to buried antennas that the kit builder/installer should be aware of prior to electing to install a buried antenna. See also Section 6.6.3, Non-structural In ...
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Garmin GDU 37X - page 52
Page 6-6 G3X Installation Manual – An tennas Revision A 190-01115-01 Mounting the antenna under the glare shield (Figure 6- 3) is a good option for XM – FIS antennas, although it is not typically the best optio n for a GPS antenna. This location results in the aft fuselage shading the antenna. Figure 6-3. Glare Shield Buried Antenna Area NOTE D ...
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Garmin GDU 37X - page 53
G3X Installat ion Man ual – A nte nnas Page 6-7 190-01115-01 Revision A 6.4 Teardrop Footprint Antenna Insta llation (GA 55 and GA 56) 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 ...
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Garmin GDU 37X - page 54
Page 6-8 G3X Installation Manual – An tennas Revision A 190-01115-01 6.4.2 Antenna Installation Instructions 1. Refer to Table 6-5 and the drawings in Appe ndix C for gui dance on selecting the appropriate mounting cutout. Drill or punch t he holes to match the mating part (doubler). 2. Install a doubler plate to reinforce the aircraft skin , as ...
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Garmin GDU 37X - page 55
G3X Installat ion Man ual – A nte nnas Page 6-9 190-01115-01 Revision A 6.4.3 Reference Figures Figure 6-4. Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" Figure 6-5. Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" ...
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Garmin GDU 37X - page 56
Page 6-10 G3X Installation Manual – Antennas Revision A 190-01115-01 Figure 6-6. Doubler Design, Teardrop Footprint Antenna, Skin Thickness 0.051" to 0.063" Figure 6-7. Sample Doubler Location, Teardrop Footprint Antenna, Metal Skin Aircraft ...
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Garmin GDU 37X - page 57
G3X Installation Manual – Antennas Page 6-11 190-01115-01 Revision A Figure 6-8. Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" Figure 6-9. Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" ...
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Garmin GDU 37X - page 58
Page 6-12 G3X Installation Manual – Antennas Revision A 190-01115-01 Figure 6-10. Skin Cutout Detail, Teardrop Footprint Antenna, Skin Thickness 0.051" to 0.063" Figure 6-11. Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.032" to 0.049" ...
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Garmin GDU 37X - page 59
G3X Installation Manual – Antennas Page 6-13 190-01115-01 Revision A Figure 6-12. Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.049" to 0.051" Figure 6-13. Doubler Installation, Teardrop Footprint Antenna, Skin Thickness 0.051" to 0.063" ...
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Garmin GDU 37X - page 60
Page 6-14 G3X Installation Manual – Antennas Revision A 190-01115-01 6.5 ARINC 743 Footprint Antenna Inst allation (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: 115-00846-0 0 doubler plate. Another acceptable method is t ...
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Garmin GDU 37X - page 61
G3X Installation Manual – Antennas Page 6-15 190-01115-01 Revision A 6.5.2 Antenna Installation Instructions 1. Refer to Table 6-6 (and to Figures in Appendix C) for guidance on selecting the appropriate mounting cutout. Drill or punch t he holes to match the mating part (doubler). 2. Install a doubler plate to reinforce the aircraft skin , as re ...
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Garmin GDU 37X - page 62
Page 6-16 G3X Installation Manual – Antennas Revision A 190-01115-01 6.5.3 Reference Figures Figure 6-14. Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.032" to 0.049" ...
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Garmin GDU 37X - page 63
G3X Installation Manual – Antennas Page 6-17 190-01115-01 Revision A Figure 6-15. Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.049" to 0.051" ...
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Garmin GDU 37X - page 64
Page 6-18 G3X Installation Manual – Antennas Revision A 190-01115-01 Figure 6-16. Doubler Design, ARINC 743 Footprint Antenna, Skin Thickness 0.051" to 0.063" ...
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Garmin GDU 37X - page 65
G3X Installation Manual – Antennas Page 6-19 190-01115-01 Revision A Figure 6-17. Sample Doubler Location, ARINC 743 Antenna, Metal Skin Aircraft Figure 6-18. Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.032" to 0.049" ...
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Garmin GDU 37X - page 66
Page 6-20 G3X Installation Manual – Antennas Revision A 190-01115-01 Figure 6-19. Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.049" to 0.051" Figure 6-20. Skin Cutout Detail, ARINC 743 Footprint Antenna, Skin Thickness 0.051" to 0.063" ...
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Garmin GDU 37X - page 67
G3X Installation Manual – Antennas Page 6-21 190-01115-01 Revision A Figure 6-21. Doubler Installation, ARINC 743 Footprint Antenna, Skin Thickness 0.032" to 0.049" Figure 6-22. Doubler Installation, ARINC 743 Footprint Antenna, Skin Thickness 0.049" to 0.051" ...
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Garmin GDU 37X - page 68
Page 6-22 G3X Installation Manual – Antennas Revision A 190-01115-01 Figure 6-23. Doubler Installation, ARINC 743 Footprint, Skin Thickness 0.051" to 0.063" Figure 6-24. Installation of ARINC 743 Footprint Antenna ...
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Garmin GDU 37X - page 69
G3X Installation Manual – Antennas Page 6-23 190-01115-01 Revision A 6.6 Non-Structural Mount Installation This section provides installation examples and consid erations for non-structura l mounting of teardrop and ARINC 743 footprint antennas. Typical installa tions may be below a non-metallic glareshield, under the composite or fabric skin, or ...
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Garmin GDU 37X - page 70
Page 6-24 G3X Installation Manual – Antennas Revision A 190-01115-01 6.6.2 Considerations for Non- Structural Mounting External mounting of the antenna is preferred, althoug h the antenna can be mounted inside the aircraft. When mounted internally, the antenna does not have to be aligned with the aircraft forward direction, but should be equal to ...
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Garmin GDU 37X - page 71
G3X Installation Manual – Antennas Page 6-25 190-01115-01 Revision A Figure 6-27. Example Non-structural Antenna Mounting Under Glareshield ...
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Garmin GDU 37X - page 72
Page 6-26 G3X Installation Manual – Antennas Revision A 190-01115-01 6.6.4 Non-structural Installation to Airframe Internal Non-structural Installation Figure 6-28 and Figure 6-29 show examples of under the fabric skin non-structural m ounting of the antenna to the airframe of a tube-and-fabric aircraft. In Figure 6-28, a bracket is made to attac ...
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Garmin GDU 37X - page 73
G3X Installation Manual – Antennas Page 6-27 190-01115-01 Revision A External Non-structural Installation Figure 6-30 is an example of an external, non-struct ur al mounting of the antenna in a tube-and-fabric aircraft. The antenna support bracket shown shoul d be m ade of 2024-T3 Aluminum with a minimum material thickness 0.032” and maximum di ...
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Garmin GDU 37X - page 74
Page 6-28 G3X Installation Manual – Antennas Revision A 190-01115-01 Minimum Distance from Metal Tube Structure Requirements Figure 6-31 shows minimum distance from metal tube structure requirements for internal, non-structural mounting of the antenna. Table 6-7 pre sents minimu m distance requirements between the tube structure and the antenna f ...
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Garmin GDU 37X - page 75
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Pag e 7-1 190-01115-01 Revision A 7 Software, Configuration, Databases, and XM Activation 7.1 Configuration Mode Some software loading and all configuration settings a re performed in the configuration mode. To enter configuration mode, hold down the left-hand soft ...
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Garmin GDU 37X - page 76
Page 7-2 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.2.2 Audio Data Identification Do the following steps to view the un it’s current audio data inform ation: 1. Turn on the unit in normal mode. 2. Press the MENU key twice to display the Main Menu 3. Use the FMS Joystick to select D ...
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Garmin GDU 37X - page 77
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Pag e 7-3 190-01115-01 Revision A 7.3 Software Loading Procedure Software loading is performed in normal mode. Sections 7.3.1 and 7.3.2 describe the GDU and GSU software load procedure. 7.3.1 GDU Software Loading Procedure 1. Power on the GDU in normal mode, then i ...
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Garmin GDU 37X - page 78
Page 7-4 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.4 Configuration Pages 7.4.1 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 G3X. ...
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Garmin GDU 37X - page 79
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Pag e 7-5 190-01115-01 Revision A 7.4.2 ACFT Configuration Page The Aircraft Configuration Page allows setting the para m eters for Flight Planning, Aircraft Identifier, and Map Symbol. The aircraft’s cruise speed, fuel flow, ai rcraft identifier, and map symbol ...
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Garmin GDU 37X - page 80
Page 7-6 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.4.3 W/B (Weight/Balance) Configuration Page The W/B Configuration Page allows setting the weight and balance parameters for the airplane, these parameters are then used on the Main Menu W/B Pa ge in normal mode. Weight/Balance may b ...
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Garmin GDU 37X - page 81
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Pag e 7-7 190-01115-01 Revision A 7.4.4 UNITS Configuration Page The Units Configuration Page allows selection of the desired displayed units for t h e listed items in the Units Configuration window. The various settings fo r Location Form at, Map Datum, and Headin ...
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Garmin GDU 37X - page 82
Page 7-8 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.4.5 DSPL (Display) Configuration Page The DSPL Configuration Page allo ws setting the parameters for Display and Backlight Control configuration. 1. In configuration mode, use the FMS Joystick to select the DSPL Page. 2. Use the FMS ...
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Garmin GDU 37X - page 83
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Pag e 7-9 190-01115-01 Revision A 7.4.5.1 Display Configuration Window: Backlight Intensity: Can be set to Auto or Manual (t his setting is also available in norm al mode on the Display Setup page). Auto–Sets the backlight intensity (d isplay brightness) based on ...
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Garmin GDU 37X - page 84
Page 7-10 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.4.6 SOUND Configuration Page The SOUND Configuration Page allows setting the pa rameters for various alert and message tones. 1. In configuration mode, use the FMS Joystick to select the SOUND Page. 2. Use the FMS Joystick to selec ...
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Garmin GDU 37X - page 85
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Page 7-11 190-01115-01 Revision A 7.4.7 COMM Configuration Page The COMM Configuration Page allows setting the param eters for the communication ports. 1. In configuration mode, use the FMS Joystick to select the COMM Page. 2. Use the FMS Joystick to select the des ...
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Garmin GDU 37X - page 86
Page 7-12 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 7.5 Garmin Database Updates The GDU 37X MFD database updates can be obtained by visiting the ‘flyGarmin’ website ( www.fly.garmin.com ). The ‘flyGarmin’ website requires the uni t’s System ID to update databases, this allow ...
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Garmin GDU 37X - page 87
G3X Installation Man u al – Software, Configura tion, Databases, and XM Activation Page 7-13 190-01115-01 Revision A 5. When the update process is complete , the screen updates 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. 8. ...
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Garmin GDU 37X - page 88
Page 7-14 G3X Installation Manual – Sof tware, Configuration, Databases, and XM Activation Revision A 190-01115-01 all obstacles are necessarily charted and therefore may not be contained in the obstacle database. This database is updated on a 56-day cycle. SafeTaxi The SafeTaxi database contains detailed airport diag rams for selected airports. ...
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Garmin GDU 37X - page 89
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-1 190-01115-01 Revision A 8. Post-Installation Checkout and Calibration Procedures The checkout procedures in this section are recommended to be performed after installing the G3X. The calibration procedures are required to be performed after installing the G3 ...
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Garmin GDU 37X - page 90
Page 8-2 G3X Installation Manual – Post In stallatio n Checkout and Calibration Proced ures Revision A 190-01115-01 8.1 Recommended Test Equipment The following test equipment is recommended to conduct and complete all post installation checkout procedures in this section: (All t est equipment should have current calibration records) • Pitot/st ...
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Garmin GDU 37X - page 91
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-3 190-01115-01 Revision A Test the XM Receiver (if applicable): 1. Power on unit and use the FMS Joystick to select the XM Page. 2. Verify that the XM receiver is functioning co rrectly as indicated by the green signal strength bars. See Section 8.6 for XM Act ...
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Garmin GDU 37X - page 92
Page 8-4 G3X Installation Manual – Post In stallatio n Checkout and Calibration Proced ures Revision A 190-01115-01 8.3 GSU 73/GMU 44 Post-Installation Calibration Procedures After mechanical and electrical installati on of the GSU 73 AHRS and GMU 44 magnetometer have been completed, prior to operation, a set of post-ins tallation calibration pro ...
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Garmin GDU 37X - page 93
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-5 190-01115-01 Revision A For each Calibration Procedure, Table 8-2 lists the LRU’s that require valid calibration data. Table 8-2. Data Validity Require ments for AHRS Calibration Procedures AHRS Calibration Procedure Valid Status Required Pitch/Roll Offset ...
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Garmin GDU 37X - page 94
Page 8-6 G3X Installation Manual – Post In stallatio n Checkout and Calibration Proced ures Revision A 190-01115-01 8.3.1 Calibration Procedure A: AHRS ORIENTATION 1. Enter configuration mode by holding down the left-hand softke y while powering on the GDU 37X. 2. Use the FMS Joystick to select the GSU Page. 3. Unlock the GSU Page by pressing sof ...
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Garmin GDU 37X - page 95
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-7 190-01115-01 Revision A 9. Use the FMS Joystick to select the direction of the GSU 73 connectors per the on-screen instructions, select OK and press the ENT Key to continue. 10. After a few minutes the calibration will finish and a Done button will appear at ...
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Garmin GDU 37X - page 96
Page 8-8 G3X Installation Manual – Post In stallatio n Checkout and Calibration Proced ures Revision A 190-01115-01 8.3.2 Calibration Procedure B: Pitch/Ro ll Offset Compensation by Aircraft Leveling 1. Enter configuration mode by holding down th e left-hand softkey while powering on the GDU 37X (if needed). 2. Use the FMS Joystick to select the ...
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Garmin GDU 37X - page 97
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-9 190-01115-01 Revision A 7. Ensure that the aircraft has been prope rly leveled per the on-screen instructions. 8. Use the FMS Joystick to highlight the Calibrate button at the bottom of the display, press the ENT Key to begin the calibration. 9. After a few ...
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Garmin GDU 37X - page 98
Page 8-10 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 8.3.3 Calibration Procedure C: Ma gnetometer Calibration NOTE Calibration Procedure B must be successfully completed prior to Calibration Procedure C. NOTE Calibration Procedure C must be carried out at a location that is determined ...
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Garmin GDU 37X - page 99
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-11 190-01115-01 Revision A 3. Unlock the GSU Page by pressing softke ys 2, 3, 4 in order (if needed). 4. Ensure that all the required status boxes are checked (Tables 8-2 and 8-3). The GMU 44 and GSU 73 units must be communicating with the GDU 37X, and the GPS ...
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Garmin GDU 37X - page 100
Page 8-12 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 7. Ensure that the aircraft has been properly positioned per the on-screen instruction s. 8. Use the FMS Joystick to highlight the Calibrate button at the bottom of the display, press the ENT Key to begin the calibration. 9. The PFD ...
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Garmin GDU 37X - page 101
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-13 190-01115-01 Revision A 11. The PFD guides the operator to dwell at m u ltiple headings around a complete circle. NOTE Due to high winds or excessive airframe vibration, the operator may encounter a condition where the PFD restarts the 18-second countdown w ...
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Garmin GDU 37X - page 102
Page 8-14 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 8.3.4 Calibration Procedure D: H eading Offset Compensation NOTE Calibration Procedures B and C must have been successfully completed before Calibration Procedure D can be performed. This procedure is optional, and generally not reco ...
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Garmin GDU 37X - page 103
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-15 190-01115-01 Revision A 6. Use the FMS Joystick to highlight the Calibrate button, press the ENT Key. 7. Ensure that the aircraft has been properly positioned per the on-screen instruction s. 8. Use the FMS Joystick to highlight the Calibrate button at the ...
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Garmin GDU 37X - page 104
Page 8-16 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 11. After the complete calibration is finished, a Done button will appear at the bottom of the display, ensure that a CALIBRATION SUCC ESSFUL message appears at the bottom of the display, press the ENT Key to return to the GSU Status ...
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Garmin GDU 37X - page 105
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-17 190-01115-01 Revision A 8.3.5 Calibration Procedure E: Engi ne Run-Up Vibration Test NOTE Calibration Procedure E is required for all installations to validate the vibration characteristics of the installation. Calibration Procedures B through D are not req ...
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Garmin GDU 37X - page 106
Page 8-18 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 7. Ensure that the aircraft has been properly positioned per the on-screen instruction s. 8. Use the FMS Joystick to highlight the Calibrate button at the bottom of the display, press the ENT Key to begin the calibration. 9. The PFD ...
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Garmin GDU 37X - page 107
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-19 190-01115-01 Revision A e) Absence of mounting supports recommended by the aircraft manufacturer. f) GSU 73 connector not firmly attached to unit. g) Cabling leading to GSU 73 or GMU 44 not firmly secured to supporting structure. h) An engine/propeller comb ...
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Garmin GDU 37X - page 108
Page 8-20 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 8.3.6 Calibration Procedure F: Magn etometer Interference Test NOTE Calibration Procedure F is required for initial in stallation verification. This test should also be repeated to verify all subsequent el ectrical changes associated ...
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Garmin GDU 37X - page 109
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-21 190-01115-01 Revision A 5. Use the FMS Joystick to select MAGNETOMETER INTERFERENCE TEST. 6. Use the FMS Joystick to highlight the Calibrate button, press the ENT Key. 7. Ensure that the aircraft has been properly prepared per the on-screen instructions. Se ...
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Garmin GDU 37X - page 110
Page 8-22 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 8. Use the FMS Joystick to highlight the Calibrate button at the bottom of the display, press the ENT Key to begin the calibration. 9. The operator should carry out the actions calle d for in the prepared test sequence. NOTE It is im ...
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Garmin GDU 37X - page 111
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-23 190-01115-01 Revision A Table 8-4. Magnetometer In terference Test Sequence Example Elapsed Time Since Start of Test (min:secs) Action 0:00 Test begins 0:10 Aileron full right 0:20 Aileron full left 0:30 Aileron level 0:40 Flaps down 0:50 Flaps up 1:00 Land ...
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Garmin GDU 37X - page 112
Page 8-24 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 8.3.7 Site Evaluation of Magnetic Distur bances for Magnetometer Calibration Procedure As mentioned in Section 8.3.3, the Magnetometer Ca libration Procedure (Calibration Procedure C) must be carried out at a site that is determ ined ...
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Garmin GDU 37X - page 113
G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Page 8-25 190-01115-01 Revision A NOTE The Magnetometer Calibration Procedure mu st consistently report “CALIBRATION SUCCESSFUL / SITE IS CLEAN” in both the clockwise and counter-clockwise directions for the site to be considered accep table. More than one failur ...
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Garmin GDU 37X - page 114
Page 8-26 G3X Installation Manual – Post Installation Ch eckout and Calibration Procedures Revision A 190-01115-01 This page intentionally left blank ...
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Garmin GDU 37X - page 115
G3X Install ation Manual - Troublesho oting Page 9-1 190-01115-01 Revision A 9 Troubleshooting In this section the term ‘Red-X’ refers to a red “X ” that appears on different areas of the display to indicate the failure of that particular function. Refer to the G3X Pilot’s Guide (190-01054-00) for a complete listing of System Status Messa ...
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Garmin GDU 37X - page 116
Page 9-2 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 9.2 GMU 44 Figure 9-1 – Heading Failure Indication (Full-Screen PFD) 9.2.1 Red-X Failures If a Red-X (steady or intermittent) is displayed on th e heading (Figure 9-1), check the following while the aircraft is on the ground: 1. When taxiing without reliable GPS informat ...
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Garmin GDU 37X - page 117
G3X Install ation Manual - Troublesho oting Page 9-3 190-01115-01 Revision A 9.3 GSU 73 GSU 73 ground operation is heavily dependent on GP S data inputs. Be sure to correct any GPS performance problems (i.e. interference caused by some types of cell phones or anything that transmits in the area) before troubleshooting the GSU 73/GMU 44. For GPS dat ...
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Garmin GDU 37X - page 118
Page 9-4 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 9.3.1 Attitude/Heading Failure Troubleshooting Prior to troubleshooting an Attitude Failure on-board the aircraft, gather information from the pilot by asking the following questions. 1. What specifically was the nature of the failu re? Was it a Red-X of only heading, only ...
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Garmin GDU 37X - page 119
G3X Install ation Manual - Troublesho oting Page 9-5 190-01115-01 Revision A Figure 9-2 – Attitude, Air Data, and E ngine/Airframe Failure Indication (Reversionary or Split-Screen PFD) Figure 9-3 – Attitude Fa il Indication (PFD) ...
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Garmin GDU 37X - page 120
Page 9-6 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 Figure 9-4 – AHRS Align Message (PFD) 9.3.2 Heading/Pitch/Roll Troubleshooting The GSU 73 may not be able to provide valid h eading/pitch/roll data for the following reasons: 1. The GSU 73 external memory module in the harn ess (that stores the installation configuration ...
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Garmin GDU 37X - page 121
G3X Install ation Manual - Troublesho oting Page 9-7 190-01115-01 Revision A 9.4 GSU 73 –Air Data Troubleshooting Under normal operating conditions, the GSU 73 pr ovides the following air data inform ation: • Total Air Temperature is measured • Outside Air Temperature (OAT) • Indicated Airspeed (IAS) • True Airspeed (TAS) • Barometric A ...
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Garmin GDU 37X - page 122
Page 9-8 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 1. Inspect GSU73 pitot/static plumbing inte grity 2. Inspect pitot/static ports and associated equipment 3. If the problem persists replace the GSU 73 with a known good unit 9.4.1 Troubleshooting GSU 73 Engi ne Indication Failures See Figure 9-7 for example. The following ...
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Garmin GDU 37X - page 123
G3X Install ation Manual - Troublesho oting Page 9-9 190-01115-01 Revision A Figure 9-7 – Attitude, Heading, Air Da ta, and Engine/Airframe Failure (Reversionary or Split-Screen PFD) ...
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Garmin GDU 37X - page 124
Page 9-10 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 9.5 Troubleshooting On-board the Aircraft 1. Review the airframe logbook to verif y if any G3X or other avionics or electrical maintenance had been performed recently that may have contributed to the failure. 2. Check for loose wire terminals on the circu it breaker conne ...
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Garmin GDU 37X - page 125
G3X Install ation Manual - Tr oubleshooting Page 9-11 190-01115-01 Revision A 9.6 GSU Page All three status boxes on the GSU Page (config mode) must indicate a positive state (green check marks) before performing any calibration procedures (Sec tion 8). The GMU 44 and GSU 73 units must be communicating with the GDU 37X, and the GPS antenna must hav ...
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Garmin GDU 37X - page 126
Page 9-12 G3X Installation Manual –Troublesh ooting Revision A 190-01115-01 This page intentionally left blank ...
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Garmin GDU 37X - page 127
G3X Installation Manual – Return to Service Page 10-1 190-01115-01 Revision A 10 Return to Service Information These return to service procedures are intended to ve rify the serviceability of the appliance only. These tests alone do not verify or otherwise validate the airworthiness of the installation. 10.1 GDU 37X 10.1.1 Original GDU 37X is Rei ...
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Garmin GDU 37X - page 128
Page 10-2 G3X Installation Manual – Return to Service Revision A 190-01115-01 10.2.2 New GSU 73 Installed If a new GSU 73 is installed (new serial number), verify the correct software version on the MAIN page in configuration mode. If the correct software ve rsion is not installed, load the GSU 73 software contained in the G3X system software loa ...
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Garmin GDU 37X - page 129
G3X Installat i on Manual – Pino uts Page A-1 190-01115-01 Revision A APPENDIX A G3X Pinouts A.1 GDU 37X A.1.1 P3701 Connector PIN 1 PIN 17 PIN 18 PIN 33 PIN 34 PIN 50 Figure A-1. View of J3701 Connector from Back of Unit Pin Pin Name I/O 1 MONO AUDIO OUT HI Out 2 STEREO AUDIO OUT LO -- 3 STEREO AUDIO OUT LEFT Out 4 SPARE -- 5 SPARE -- 6 SPARE -- ...
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Garmin GDU 37X - page 130
Page A-2 G3X Installation Manual – Pinouts Revision A 190-01115-01 Connector P3701, continued Pin Pin Name I/O 33 CONFIG MODULE CLOCK I/O 34 SIGNAL GROUND -- 35 SIGNAL GROUND -- 36 SIGNAL GROUND -- 37 SIGNAL GROUND -- 38 SPARE -- 39 SPARE -- 40 SPARE -- 41 SPARE -- 42 CDU SYST EM ID PROGRAM* 4 In 43 14V LIGHTING BUS HI In 44 SIGNAL GROUND -- 45 C ...
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Garmin GDU 37X - page 131
G3X Installat i on Manual – Pino uts Page A-3 190-01115-01 Revision A A.1.4 Serial Data A.1.4.1 RS-232 The RS-232 outputs conform to EIA Standard RS-232C with an o utput voltage swing of 0-5V when driving a standard RS-232 load. Pin Name Connector Pin I/O RS-232 IN 1 P3701 47 In RS-232 OUT 1 P3701 48 Out RS-232 IN 2 P3701 14 In RS-232 OUT 2 P3701 ...
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Garmin GDU 37X - page 132
Page A-4 G3X Installation Manual – Pinouts Revision A 190-01115-01 A.1.6 Audio A.1.6.1 Mono Audio Pin Name Connector Pin I/O MONO AUDIO OUT HI P3701 1 Out MONO AUDIO OUT LO P3701 18 -- A.1.6.2 Stereo Audio Pin Name Connector Pin I/O STEREO AUDIO OUT LEFT P3701 3 Out STEREO AUDIO OUT LO P3701 20 -- STEREO AUDIO OUT RIGHT P3701 19 Out STEREO AUDIO ...
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Garmin GDU 37X - page 133
G3X Installat i on Manual – Pino uts Page A-5 190-01115-01 Revision A A.2 GMU 44 A.2.1 P441 Connector Figure A-2. View of J441 Connector Looking at Rear of Unit Pin Pin Name I/O 1 SIGNAL GROUND -- 2 RS-485 OUT B Out 3 SIGNAL GROUND -- 4 RS-485 OUT A Out 5 SPARE -- 6 POWER GROUND -- 7 SPARE -- 8 RS-232 IN In 9 +12 VDC POWER In A.2.2 Power Function ...
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Garmin GDU 37X - page 134
Page A-6 G3X Installation Manual – Pinouts Revision A 190-01115-01 A.3 GSU 73 A.3.1 Connector Description The GSU 73 has one 62-pin connector (J731) and on e 78-pin connector (J732) located on the connector end of the unit, as shown below. J731 and J73 2 are clearly marked on the connector end plate. J732 J731 Figure A-3 Rear View of Connector En ...
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Garmin GDU 37X - page 135
G3X Installat i on Manual – Pino uts Page A-7 190-01115-01 Revision A Connector P731, continued Pin Pin Name I/O 16 RS-232 IN 2 In 17 RS-232 OUT 2 Out 18 RS-232 IN 3 In 19 RS-232 OUT 3 Out 20 ARINC 429 OUT 1 A Out 21 ARINC 429 OUT 1 B Out 22 ARINC 429 OUT 2 A Out 23 ARINC 429 OUT 2 B Out 24 SIGNAL GROUND -- 25 ARINC 429 IN 1 A In 26 ARINC 429 IN ...
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Garmin GDU 37X - page 136
Page A-8 G3X Installation Manual – Pinouts Revision A 190-01115-01 A.3.2.2 P732 Connector Figure A-5 Rear Connector J732 Viewed from Connector End of Unit Pin Pin Name I/O 1 ANALOG IN 2 LO In 2 ANALOG IN 3 HI In 3 ANALOG IN 8 LO In 4 ANALOG IN 9 LO In 5 ANALOG IN 14 LO In 6 ANALOG IN 17 LO In 7 ANALOG IN 24 LO In 8 ANALOG IN 23 LO In 9 THERMOCOUP ...
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Garmin GDU 37X - page 137
G3X Installat i on Manual – Pino uts Page A-9 190-01115-01 Revision A Connector P732, continued Pin Pin Name I/O 40 ANALOG IN 4 LO In 41 ANALOG IN 1 LO In 42 ANALOG IN 10 LO In 43 ANALOG IN 7 LO In 44 ANALOG IN 15 LO In 45 ANALOG IN 16 LO In 46 ANALOG IN 25 LO In 47 ANALOG IN 22 HI In 48 ANALOG/CURRENT MONIT OR IN 2 HI In 49 ANALOG IN 21 LO In 50 ...
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Garmin GDU 37X - page 138
Page A-10 G3X Installation Manual – Pi nouts Revision A 190-01115-01 A.3.3 Power I/O A.3.3.1 Aircraft Power The GSU 73 has four inputs for aircraft power bus inputs of 14/28Vdc. Pin Connector Pin Name I/O 47 P731 AIRCRAFT POWER 1 IN 49 P731 AIRCRAFT POWER 2 IN 59 P731 POWER GROUND -- 61 P731 POWER GROUND -- A.3.3.2 Transducer Output Power The GSU ...
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Garmin GDU 37X - page 139
G3X Installat i on Manual – Pino uts Page A-11 190-01115-01 Revision A A.3.5 Serial Data Electrical Characteristics A.3.5.1 ARINC 429 Input/Output The ARINC 429 outputs conform to ARINC 429 electrical specifications when loaded with up to 5 standard ARINC 429 receivers. Pin Connector Pin Name I/O 20 P731 ARINC 429 OUT 1A OUT 21 P731 ARINC 429 OUT ...
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Garmin GDU 37X - page 140
Page A-12 G3X Installation Manual – Pi nouts Revision A 190-01115-01 A.3.5.3 RS-485 Input The GSU 73 contains one channel of RS-485 serial data communications. Pin Connector Pin Name I/O 1 P731 MAGNETOMETER RS-485 IN B IN 2 P731 MAGNETOMETER RS-485 IN A IN A.3.5.4 CAN Bus This data bus conforms to the BOSCH standard fo r Controller Area Network 2 ...
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Garmin GDU 37X - page 141
G3X Installat i on Manual – Pino uts Page A-13 190-01115-01 Revision A A.3.6.2 Discrete Outputs INACTIVE: Floating (can be pulled up to externall y sourced Vout in the range 0 Vout 33VDC) Leakage current in the INAC TIVE state is typically 10 uA to ground ACTIVE: Vout 0.5VDC with 20 mA sink current Sink current mus ...
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Garmin GDU 37X - page 142
Page A-14 G3X Installation Manual – Pi nouts Revision A 190-01115-01 NOTE If installing an ungrounded thermocouple to an Analog In input, a DC reference must be added to the LO input. This can be accomplished by adding a resistance of 1 M or less between ground and the Analog In LO input that the ungrounded t hermocouple is installed on. Pin ...
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Garmin GDU 37X - page 143
G3X Installat i on Manual – Pino uts Page A-15 190-01115-01 Revision A Pin Connector Pin Name I/O 47 P732 ANALOG IN 22 HI IN 67 P732 ANALOG IN 22 LO IN 28 P732 ANALOG IN 23 HI IN 8 P732 ANALOG IN 23 LO IN 27 P732 ANALOG IN 24 HI IN 7 P732 ANALOG IN 24 LO IN 66 P732 ANALOG IN 25 HI IN 46 P732 ANALOG IN 25 LO IN 70 P732 ANALOG/CURRENT MONITOR IN 1 ...
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Garmin GDU 37X - page 144
Page A-16 G3X Installation Manual – Pi nouts Revision A 190-01115-01 The following table lists the minimum frequency, maximum frequency, and duty cycles for each of these inputs. Pin Name Minimum Frequency Maximum Frequency Duty Cycle FREQUENCY COUNTER IN* 1 1 Hz 500 Hz/100 KHz* 50% FREQUENCY COUNTER IN* 2 1 Hz 500 Hz/100 KHz* 50% FREQUENCY COUNT ...
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Garmin GDU 37X - page 145
G3X Installat ion Man ual – A ppe ndix B Page B-1 190-01115-01 Revision A APPENDIX B Connector Inst allation Instructions B.1 Thermocouple Instal lation into a Backshell Table B-1 lists parts needed to install a Thermocoupl e. Parts for this installation are included in the Thermocouple Kit (011-00981-00), whic h is include d in the G3X Installat ...
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Garmin GDU 37X - page 146
Page B-2 G3X In st al l a tion Man ual – A ppe ndix B Revision A 190-01115-01 Figure B-2. Jackscrew Backshell Thermocouple Installation ...
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Garmin GDU 37X - page 147
G3X Installat ion Man ual – A ppe ndix B Page B-3 190-01115-01 Revision A B.2 Jackscrew Configuration Module Inst allation into a Jackscrew Backshell Tables B-2 & B-3 list parts needed to install a Jackscrew Configuration Module with pins or with sockets. Parts for these installations are included in the 01 1-00979-20 and 011-00979-22 kits, w ...
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Garmin GDU 37X - page 148
Page B-4 G3X In st al l a tion Man ual – A ppe ndix B Revision A 190-01115-01 NOTES For the following steps please refer to Figures B-3 & B-4. 1. Strip back approximately 0.17 inches of insulation from each wire of the four conductor wire harness (item 3) and crimp either a pin (item 4) or a socket (item 9) to each conductor. It is the respon ...
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Garmin GDU 37X - page 149
G3X Installat ion Man ual – A ppe ndix B Page B-5 190-01115-01 Revision A Figure B-4. Jackscrew Backshell Installation ...
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Garmin GDU 37X - page 150
Page B-6 G3X In st al l a tion Man ual – A ppe ndix B Revision A 190-01115-01 B.3 Jackscrew Backshell Installation Instructions B.3.1 Shield Block Installation Parts Tables B-4 and B-5 list the parts needed to install a Sh ield Block. Parts listed in Table B-4 are supplied in the jackscrew backshell kits (011-01855-03 and 011- 018 55-04). Parts l ...
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Garmin GDU 37X - page 151
G3X Installat ion Man ual – A ppe ndix B Page B-7 190-01115-01 Revision A NOTE In Figure B-5, “AR” denotes quantity “As Re quired” for the particular installation. Figure B-5. Shield Install onto a Jackscrew Backshell (78 pin example) ...
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Garmin GDU 37X - page 152
Page B-8 G3X In st al l a tion Man ual – A ppe ndix B Revision A 190-01115-01 B.3.2 Shield Termination T echnique – Method A.1 (Standard) NOTE 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 ...
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Garmin GDU 37X - page 153
G3X Installat ion Man ual – A ppe ndix B Page B-9 190-01115-01 Revision A 3. Connect a Flat Braid (item 4) to the shield e xposed through the window of the prepared cable assembly (item 2) from step 2. The Flat Braid should go out the front of the termination towards the connector. It is not permitted to exit the r ear of the termination and loop ...
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Garmin GDU 37X - page 154
Page B-10 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 Secondary Method: Solder a Flat Braid (item 4) to the shield exposed through the window of the pre p ared cable assembly (item 2). Ensure a solid electrical connection thr ough t h e use of acceptable soldering practices. Use care to avoid applying excessive heat that burn ...
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Garmin GDU 37X - page 155
G3X Installat ion Man ual – A ppe ndix B Page B-11 190-01115-01 Revision A 6. Insert newly crimped pins and wires into the appropriate connector housing loc ation as specified by the installation wiring diagrams. 7. Cut the Flat Braid (item 4) to a length that, with the addition of a ring term inal, will reach one of the tapped holes of the Jacks ...
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Garmin GDU 37X - page 156
Page B-12 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 B.3.3 Shield Termination Techni que - Method A.2 (Daisy Chain) In rare situations where more braids need to be terminated for a connector than three per ring terminal it is allowable to daisy chain a maximum of two shield s together before coming to the ring terminal (Figu ...
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Garmin GDU 37X - page 157
G3X Installat ion Man ual – A ppe ndix B Page B-13 190-01115-01 Revision A Connect a Flat Braid (item 4) to the folded back shield of the prepared cable assembly. The flat braid should go out the front of the termination to war ds the connector. It is not permitted to exit the rear of the termination and loop back towa rds the connector. (Fi gure ...
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Garmin GDU 37X - page 158
Page B-14 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 Table B-7. Shielded Cable P reparations – (Quick Term) Backshell Size Number of Pins Std/HD Quick Term Min (inches) Quick Term Max (inches) Quick Term Float (inches) 1 9/15 1.25 2.25 1.75 2 15/26 1.5 2.5 2.0 3 25/44 1.5 2.5 2.0 4 37/62 1.5 2.5 2.0 5 50/78 1.5 2.5 2.0 B.3 ...
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Garmin GDU 37X - page 159
G3X Installat ion Man ual – A ppe ndix B Page B-15 190-01115-01 Revision A B.3.6. Daisy Chain between Methods A and B In rare situations where more braids need to be term inated for a connector than three per ring terminal and a mixture of Methods A and B have been used, it is allowable to daisy chain a maxim u m of two shields together from a Me ...
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Garmin GDU 37X - page 160
Page B-16 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 B.3.7 Double-Shield Termi nation Technique - Method C.1 In rare situations where double shielding may be necessary, the outer shield should be grounded at both ends, while the inner shield s hould be grounded only at one end. All other restrictions set forth for in Table B ...
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Garmin GDU 37X - page 161
G3X Installat ion Man ual – A ppe ndix B Page B-17 190-01115-01 Revision A B.3.8 Double-Shield Termination Technique (Quick Term) - Method C.2 In addition to method C.1, described previously, another suitable method for double-shielding wires is presented in Figure B-13. All restrictions set forth for Method C.1 (Table B-8) are still applicable. ...
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Garmin GDU 37X - page 162
Page B-18 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 B.3.10 Splicing Signal Wires NOTES Figure B-14 illustrates that a splice must be made within a 3 inch window from outside the edge of clamp to the end of the 3 inc h max mark. WARNING Keep the splice out of the backshell for pin ex traction, and outside of the strain relie ...
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Garmin GDU 37X - page 163
G3X Installat ion Man ual – A ppe ndix B Page B-19 190-01115-01 Revision A B.4 Circular Connector I nstallation Instructions B.4.1 Pigtail Installation Parts Table B-9 provides a list of parts needed to install a circular connector with backshell. Parts for this installation are included in the pigtail connector kits and some are to be provided b ...
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Garmin GDU 37X - page 164
Page B-20 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 NOTE In Figure B-15, “AR” denotes quantity “As Re quired” for the particular installation. Figure B-15. Circular Connector Install (19 contact example) B.4.2 Standard Shield Termi nation Technique – Method A Figure B-16. Standard Shield Termination ...
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Garmin GDU 37X - page 165
G3X Installat ion Man ual – A ppe ndix B Page B-21 190-01115-01 Revision A Table B-11. Shielded Cable Preparations for Garmin Connectors Float (in) Window (in) Backshell Size Insert Arrangement Min Max Ideal Min Max Ideal 14 19 1.35 1.60 1.50 2.10 4.60 3.60 1. At one end of a shielded cable (item 4) meas ure a distance between “Window Min” to ...
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Garmin GDU 37X - page 166
Page B-22 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 Secondary Method Solder a flat braid (item 6) to the shield exposed through t he window of the prepared cable assembly (item 4). Ensure a solid electrical connection thr ough t h e use of acceptable soldering practices. Use care to avoid applying excessive heat that burns ...
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Garmin GDU 37X - page 167
G3X Installat ion Man ual – A ppe ndix B Page B-23 190-01115-01 Revision A Figure B-17. Insulation/Contact Clearance 5. Insert newly crimped contacts and wires into the appropriate conn ector housing location as specified by the installation wiring diagrams. 6. Cut the flat braid (item 6) to a length that, with the addition of a ring term inal, w ...
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Garmin GDU 37X - page 168
Page B-24 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 B.4.3 Daisy Chain Shield Termination Technique – Method A In rare situations where more braids need to be terminated for a connector than three per ring terminal it is allowable to daisy chain a maximum of two shields to gether before coming to the ring terminal (Figure ...
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Garmin GDU 37X - page 169
G3X Installat ion Man ual – A ppe ndix B Page B-25 190-01115-01 Revision A B.4.4 Quick Term Shield Termination – Method B If desired, the drain wire termination (item 5) a nd the floating shield termination (item 7) can be effectively combined into a “Quick Term”. This me thod eliminates the float in the cable insulation and moves the place ...
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Garmin GDU 37X - page 170
Page B-26 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 Preferred Method Slide a solder sleeve (item 5) onto the prepared cab le assembly (item 4) and connect the flat braid (item 6) to the shield using a heat gun approved for use with solder sleeves. It may prove beneficial to use a solder sleeve with a pre-installed flat brai ...
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Garmin GDU 37X - page 171
G3X Installat ion Man ual – A ppe ndix B Page B-27 190-01115-01 Revision A 8. Terminate the ring terminals to the circular b ackshell (item 3) by plac ing items on the provided pan head screw in the following order: flat washer (provided with circular backshell), first ring terminal, second ring terminal, third rin g terminal (if needed) before f ...
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Garmin GDU 37X - page 172
Page B-28 G3X Installat ion Man ual – A ppe ndix B Revision A 190-01115-01 B.4.6 Daisy Chain Shield Termination Between Methods A and B In rare situations where more braids need to be term inated for a connector than three per ring terminal and a mixture of Methods A and B have been used, it is allowable to daisy chain a maxim u m of two shields ...
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Garmin GDU 37X - page 173
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-1 (Page C-2 blank) 190-01115-01 Revision A 7.83 198.8 6.04 153.4 2.98 75.8 3.89 98.7 2X 1.72 43.7 .004 0.1 1.09 27.7 [86.7] 3.41 .59 15.0 1.08 27.5 #6-32 CAPTIVE SCREW (4 PLCS) 5.47 139.1 7.25 184.2 3.41 86.7 .28 7.2 .29 7.3 .93 23. ...
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Garmin GDU 37X - page 174
APPENDIX C OUTLINE & INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawings Page C-3 (Page C-4 blank) 190-01115-01 Revision A Drawing is not to scale! Use for dimensions only. 4X 4X 45 ° 45° 4X 4X . 1 60 .160 4 . 1 4.1 R R .3 9 .39 TYP . TYP. 1 0 . 0 10.0 . 1 9 .19 TYP. 4.9 1.24 31.5 0 0 0 .0 0.0 1 .5 0 1.50 38 ...
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Garmin GDU 37X - page 175
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawings Page C-5 (Page C-6 blank) 190-01115-01 Revision A 2.520 64.01 3.370 85.60 GMU 44 MOUNTING RACK NOTE : 1. DIMENSIONS IN INCHES [mm] 2. SEE SECTIONS 3 AND 4 FOR MOUNTING INSTRUCTIONS OF THE GSU 73 AHRS AND GMU 44 MAGNETOMETER UNIT . 3. FOLLOW ...
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Garmin GDU 37X - page 176
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-7 (Page C-8 blank) 190-01115-01 Revision A 3.37 85.60 2.10 53.34 2.38 60.33 1.84 46.61 8.4 214 .3 8 A IRCRAFT MOUNTING SURFACE NOTES: 1. DIMENSIONS IN INCHES [mm] GMU 44 INSTALLATION FROM ABOVE (PREFERRED) GMU 44 AIRCRAFT MOUNTING R ...
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Garmin GDU 37X - page 177
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-9 (Page C-10 blank) 190-01115-01 Revision A GMU 44 6-32 100 FLAT HEAD BRASS SCREWS REQUIRED 6-32 PAN HEAD BRASS SCREWS 0.24 [6.1] MAX THREAD LENGTH WITHOUT CLEARANCE HOLES AIRCRAFT MOUNTING RACK 2.23 56.52 2.38 60.33 8.4 214 3.370 8 ...
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Garmin GDU 37X - page 178
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-11 (Page C -12 blank) 190-01115-01 Revision A NOTE: 1. BUBBLE NUMBERS IN THIS DRA WING REFER TO REFERENCE NUMBERS LISTED IN T ABLES 3-6 AND 3-7. Figure C-2.4 GMU 44 Wiring Detail ...
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Garmin GDU 37X - page 179
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-13 (Page C -14 blank) 190-01115-01 Revision A 2.8 71 1.8 46 3.2 81 4.46 113.2 NOTES: DIMENSIONS: INCHES[mm]. 1. DIMENSIONS ARE SHOWN FOR REFERENCE ONLY. 2. MOUNTING HOLES FOR #10 PAN HEAD OR HEX HEAD FASTENERS. 3. CENTER OF GRAVITY ...
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Garmin GDU 37X - page 180
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-15 (Page C -16 blank) 190-01115-01 Revision A Figure C-4.1 GTP 59 O.A.T. Probe Installation Drawing ...
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Garmin GDU 37X - page 181
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawings Page C-17 (Page C-18 blank) 190-01115-01 Revision A AIRCRAFT SKIN FORWAR D FABRICATE AND INSTALL DOUBLER PLATE TORQUE 20 TO 25 in-lbs 011-01153-00 AS REQUIRED TO COMPLY WITH APPLICABLE GA 55A XM ANTENNA #10-32 PHP x 1.00[25.4] AIRWORTHINESS ...
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Garmin GDU 37X - page 182
APPENDIX C OUTLINE AND INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawings Page C-19 (Page C-20 blank) 190-01115-01 Revision A 3.00 76.2 2X 1.25 31.8 5.00 127.0 FORWARD BACKING PLATE OUTLINE .83 [21.1] 2.59 65.8 .60 15.2 BNC CONNECTOR FRONT VIEW 011-00134-00 ANTENNA, AVIATION, GA 56 253-00002-00 GASKET, NEOPRENE A ...
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Garmin GDU 37X - page 183
APPENDIX C OUTLINE & INSTALLATION DRAWINGS G3X Installation Manual – Ou tline & Installation Drawing s Page C-21 (Page C -22 blank) 190-01115-01 Revision A .25 6.4 2.35 59.7 2X 0 2X 1.600 40.64 2X 0 1.000 25.40 2.350 59.69 2X 3.300 83.82 .70 17.8 .65 16.5 2X .800 20.3 .49 12.3 XM GPS BNC CONNECTOR TNC CONNECTOR FORWARD 4.70 119.4 MOUNTING ...
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Garmin GDU 37X - page 184
APPENDIX D INTERCONNECT DRAWING G3X Installation M anual – Interconnect Drawings Page D-1 (Page D-2 blank) 190-01115-01 Revision A Figure D-1.1 Notes, 14V Power, and Antennas ...
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Garmin GDU 37X - page 185
APPENDIX D INTERCONNECT DRAWING G3X Installation M anual – Interconnect Drawings Page D-3 (Page D-4 blank) 190-01115-01 Revision A Figure D-1.2 GDU 37X and GSU 73 ...
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Garmin GDU 37X - page 186
APPENDIX E EXTERNAL INTERFACE DRAWING (EXAMPLE ONLY) G3X Installation Manual – Ex ternal Interface Drawings Page E-1 (Page E-2 blank) 190-01115-01 Revision A Figure E-1.1 Notes, GDU 37X RS-232 and Audio Examples ...
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Garmin GDU 37X - page 187
APPENDIX E EXTERNAL INTERFACE DRAWING (EXAMPLE ONLY) G3X Installation Manual – Ex ternal Interface Drawings Page E-3 (Page E-4 blank) 190-01115-01 Revision A Figure E-1.2 GSU 73 RS-232 and ARINC 429 Examples ...
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Garmin GDU 37X - page 188
APPENDIX E EXTERNAL INTERFACE DRAWING (EXAMPLE ONLY) G3X Installation Manual – Ex ternal Interface Drawings Page E-5 (Page E-6 blank) 190-01115-01 Revision A Figure E-1.3 Tru Trak and Trio Auto Pilot Examples ...
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