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Garmin GDU 37X Installation Manual
Summary of GDU 37X
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190-01054-01 march, 2011 revision c gdu 37x installation manual.
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Page a gdu 37x installation manual revision c 190-01054-01 © copyright 2011 garmin ltd. Or its subsidiaries all rights reserved except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, dis- seminated, downloaded or stored in any storage medium, for any purp...
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Gdu 37x installation manual page i 190-01054-01 revision c 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 hav...
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Page ii gdu 37x installation manual revision c 190-01054-01 table of contents paragraph page section 1 gdu 37x installation overview ...................................................... 1-1 unpacking unit ................................................................................................
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Gdu 37x installation manual page iii 190-01054-01 revision c paragraph page teardrop footprint antenna installation (ga 55 and ga 56) ............................................................ 3-7 preparation of doubler..................................................................................
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Page iv gdu 37x installation manual revision c 190-01054-01 paragraph page appendix b connector installation instructions............................................B-1 jackscrew backshell installation instructions...................................................................... B-1 shield bloc...
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Gdu 37x installation manual page v 190-01054-01 revision c list of figures figure page section 1 gdu 37x installation overview .......................................................1-1 coax cable installation..............................................................................................
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Page vi gdu 37x installation manual revision c 190-01054-01 figure page appendix a gdu 37x pinouts ........................................................................ A-1 view of j3701 connector from back of unit ...................................................................... A-1 appendi...
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Gdu 37x installation manual page vii 190-01054-01 revision c list of tables table page section 1 gdu 37x installation overview ...................................................... 1-1 gdu 37x lru part numbers ............................................................................................
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Page viii gdu 37x installation manual revision c 190-01054-01 limited warranty this garmin product is warranted to be free from defects in materials or workmanship for one year from the date of purchase. Within this period, garmin will at its sole option, repair or replace any components that fail i...
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Gdu 37x installation manual page 1-1 190-01054-01 revision c 1 gdu 37x installation overview 1.1 unpacking unit carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during shipment. If the unit is damaged, notify the carrier and file a claim. To jus...
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Page 1-2 gdu 37x installation manual revision c 190-01054-01 1.4 general gdu 37x lru specifications 1.4.1 garmin lru part numbers 1.4.2 power specifications all lrus are capable of operating at either 14 or 28 vdc. See table 1-3 for current draw specifications. 1.4.3 physical specifications all widt...
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Gdu 37x installation manual page 1-3 190-01054-01 revision c 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). Avoid installing the gdu 37x lrus near heat sources. If th...
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Page 1-4 gdu 37x installation manual revision c 190-01054-01 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 consi...
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Gdu 37x installation manual page 1-5 190-01054-01 revision c 1.6.3 cable installation 1. Route the coaxial cable to the unit location. Secure the cable in accordance with good aviation prac- tices. 2. Trim the coaxial cable to the desired length and install the bnc connector (330-00087-00) per the c...
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Page 1-6 gdu 37x installation manual revision c 190-01054-01 this page intentionally left blank.
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Gdu 37x installation manual page 2-1 190-01054-01 revision c 2 gdu 37x figure 2-1 gdu 37x 2.1 equipment description 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 availab...
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Page 2-2 gdu 37x installation manual revision c 190-01054-01 2.2 electrical specifications 2.2.1 electrical characteristics 2.2.2 power consumption 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 it...
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Gdu 37x installation manual page 2-3 190-01054-01 revision c 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....
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Page 2-4 gdu 37x installation manual revision c 190-01054-01 2.4 installation requirements 2.4.1 required accessories each of the following accessories is provided with the gdu 37x unit. The connector kit is required to install the unit (figure 2-2). The gdu 37x nutplate is available to reinforce th...
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Gdu 37x installation manual page 2-5 190-01054-01 revision c 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, appendix a....
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Page 2-6 gdu 37x installation manual revision c 190-01054-01 2.9 panel cutout template figure 2-3 can be used as a template when marking the panel for cutout. Dimensions below are to verify accuracy of printout only, see figure c-1.2 for complete dimensions. Figure 2-3 gdu 37x panel cutout template ...
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Gdu 37x installation manual page 3-1 190-01054-01 revision c 3 garmin gps/xm antennas for non-garmin antennas, follow the manufacturer’s installation instructions. If using a garmin ga 26c or ga 26xm, refer to the accompanying installation instructions (190-00082-00 or 190-00522-03). For ga 55/55a, ...
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Page 3-2 gdu 37x installation manual revision c 190-01054-01 *for each 1 db gain over 24 db, add 1 db of attenuation into the antenna cable path between the antenna and the gdu 375. It is the installer’s responsibility to ensure that their choice of antenna meets faa standards according to the speci...
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Gdu 37x installation manual page 3-3 190-01054-01 revision c 3.3.2 gps/xm antenna mounting location the gps antenna is a key element in the overall system performance and integrity for a gps navigation system. The mounting location, geometry, and surroundings of the antenna can affect the system per...
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Page 3-4 gdu 37x installation manual revision c 190-01054-01 figure 3-1 shows the recommended placement of antennas. Figure 3-1 recommended antenna placement 4.
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Gdu 37x installation manual page 3-5 190-01054-01 revision c 3.3.3 buried antenna (below the skin covering or glareshield) 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 a...
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Page 3-6 gdu 37x installation manual revision c 190-01054-01 mounting the antenna under the glare shield (figure 3-3) is a good option for xm – fis antennas, although it is not typically the best option for a gps antenna. This location results in the aft fuselage shading the antenna. Figure 3-3 glar...
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Gdu 37x installation manual page 3-7 190-01054-01 revision c 3.3.6 antenna grounding the antenna is grounded through the mounting hardware and the coax connection. The mounting hardware (washers and nuts) and doubler plate should make contact with an unpainted grounded surface ensuring proper antenn...
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Page 3-8 gdu 37x installation manual revision c 190-01054-01 3.4.2 antenna installation instructions 1. Refer to table 3-5 and figures c-2.X for guidance on selecting the appropriate mounting cutout. Drill or punch the holes to match the mating part (doubler). 2. Install a doubler plate to reinforce...
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Gdu 37x installation manual page 3-9 190-01054-01 revision c 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".
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Page 3-10 gdu 37x installation manual revision c 190-01054-01 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".
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Gdu 37x installation manual page 3-11 190-01054-01 revision c 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".
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Page 3-12 gdu 37x installation manual revision c 190-01054-01 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".
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Gdu 37x installation manual page 3-13 190-01054-01 revision c figure 3-13 doubler installation, teardrop footprint antenna, skin thickness 0.051" to 0.063" 3.5 arinc 743 footprint antenna installation (ga 55a, ga 57x) this section describes the structural mounting of the arinc 743 footprint antenna ...
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Page 3-14 gdu 37x installation manual revision c 190-01054-01 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 (...
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Gdu 37x installation manual page 3-15 190-01054-01 revision c 3.5.3 reference figures figure 3-14 doubler design, arinc 743 footprint antenna, skin thickness 0.032" to 0.049".
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Page 3-16 gdu 37x installation manual revision c 190-01054-01 figure 3-15 doubler design, arinc 743 footprint antenna, skin thickness 0.049" to 0.051".
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Gdu 37x installation manual page 3-17 190-01054-01 revision c figure 3-16 doubler design, arinc 743 footprint antenna, skin thickness 0.051" to 0.063".
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Page 3-18 gdu 37x installation manual revision c 190-01054-01 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".
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Gdu 37x installation manual page 3-19 190-01054-01 revision c 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".
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Page 3-20 gdu 37x installation manual revision c 190-01054-01 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".
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Gdu 37x installation manual page 3-21 190-01054-01 revision c figure 3-23 doubler installation, arinc 743 footprint, skin thickness 0.051" to 0.063" figure 3-24 installation of arinc 743 footprint antenna.
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Page 3-22 gdu 37x installation manual revision c 190-01054-01 3.6 non-structural mount installation this section provides installation examples and considerations for non-structural mounting of teardrop and arinc 743 footprint antennas. Typical installations may be below a non-metallic glareshield, ...
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Gdu 37x installation manual page 3-23 190-01054-01 revision c 3.6.2 considerations for non-structural mounting external mounting of the antenna is preferred, although the antenna can be mounted inside the aircraft. When mounted internally, the antenna does not have to be aligned with the aircraft fo...
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Page 3-24 gdu 37x installation manual revision c 190-01054-01 figure 3-27 example non-structural antenna mounting under glareshield.
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Gdu 37x installation manual page 3-25 190-01054-01 revision c 3.6.4 non-structural installation to airframe internal non-structural installation figure 3-28 and figure 3-29 show examples of under the fabric skin non-structural mounting of the antenna to the airframe of a tube-and-fabric aircraft. In...
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Page 3-26 gdu 37x installation manual revision c 190-01054-01 external non-structural installation figure 3-30 is an example of an external, non-structural mounting of the antenna in a tube-and-fabric aircraft. The antenna support bracket shown should be made of 2024-t3 aluminum with a minimum mater...
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Gdu 37x installation manual page 3-27 190-01054-01 revision c minimum distance from metal tube structure requirements figure 3-31 shows minimum distance from metal tube structure requirements for internal, non-structural mounting of the antenna. Table 3-7 presents minimum distance requirements betwe...
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Gdu 37x installation manual page 4-1 190-01054-01 revision c 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 (soft...
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Page 4-2 gdu 37x installation manual revision c 190-01054-01 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 nor...
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Gdu 37x installation manual page 4-3 190-01054-01 revision c 4.4 configuration pages 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. Thi...
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Page 4-4 gdu 37x installation manual revision c 190-01054-01 4.4.2 acft configuration page the aircraft configuration page allows setting the parameters for flight planning, aircraft identifier, and map symbol. The aircraft’s cruise speed, fuel flow, aircraft identifier, and map symbol can be entere...
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Gdu 37x installation manual page 4-5 190-01054-01 revision c 4.4.3 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 page in normal mode. Weight/balance may be used...
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Page 4-6 gdu 37x installation manual revision c 190-01054-01 4.4.4 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 acc...
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Gdu 37x installation manual page 4-7 190-01054-01 revision c 4.4.5 dspl (display) configuration page the dspl configuration page allows 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 joyst...
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Page 4-8 gdu 37x installation manual revision c 190-01054-01 4.4.5.1 display configuration window: backlight intensity: can be set to auto or manual (this setting is also available in normal mode on the display setup page). Auto–sets the backlight intensity (display brightness) based on the aircraft...
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Gdu 37x installation manual page 4-9 190-01054-01 revision c 4.4.6 sound configuration page the sound configuration page allows setting the parameters 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 select the d...
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Page 4-10 gdu 37x installation manual revision c 190-01054-01 4.4.7 comm configuration page the comm configuration page allows setting the parameters 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 desired con...
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Gdu 37x installation manual page 4-11 190-01054-01 revision c sl30 nav/comm - rs-232 format. Outputs frequency tuning and course selection data to an sl30. Sl40 comm - outputs frequency tuning data to an sl40. 4.5 garmin database updates the gdu 37x mfd database updates can be obtained by visiting t...
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Page 4-12 gdu 37x installation manual revision c 190-01054-01 4. The database(s) can be updated by either highlighting update all and pressing the ent key; or by using the fms joystick to highlight a single database and pressing the ent key. 5. When the update process is complete, the screen display...
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Gdu 37x installation manual page 4-13 190-01054-01 revision c 4.5.2 available databases jeppesen® aviation data (navdata™) the jeppesen database contains the general aviation data (navdata) used by pilots (airports, vors, ndbs, suas, etc.) and is updated on a 28-day cycle. Jeppesen® chartview™ datab...
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Page 4-14 gdu 37x installation manual revision c 190-01054-01 4.6 xm activation instructions (gdu 375 only) follow the below instructions to activate the xm receiver in the gdu 375. Before xm satellite weather can be used, the service must be activated by calling xm at 1.800.985.9200. Service is act...
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Gdu 37x installation manual page 5-1 190-01054-01 revision c 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 check...
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Page 5-2 gdu 37x installation manual revision c 190-01054-01 2. Verify that the gps receiver is functional and able to calculate its present position. 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 ...
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Gdu 37x installation manual page a-1 190-01054-01 revision c appendix a gdu 37x pinouts a.1 gdu 37x a.1.1 p3701 connector 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 out 3 stereo audio out left -- 4 spare -- 5 spare -- 6 spare -...
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Page a-2 gdu 37x installation manual revision c 190-01054-01 * indicates active low a.1.2 aircraft power aircraft power 1 and aircraft power 2 are “diode ored” to provide aircraft power redundancy. Use 22 awg wire (min) for all power and ground connections. A.1.3 demo mode selection demo mode is for...
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Gdu 37x installation manual page a-3 190-01054-01 revision c a.1.4 serial data a.1.4.1 rs-232 3 channels of rs-232 i/o data. 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. A.1.6 audio a.1.6.1 mono audio a.1.6.2 a.1.6.3 ster...
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Gdu 37x installation manual page b-1 190-01054-01 revision c appendix b connector installation instructions this instruction manual assumes skill and knowledge of aircraft harness fabrication techniques. Do not perform this installation if you are unqualified. The gdu 37x rear connector (j3701) is e...
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Page b-2 gdu 37x installation manual revision c 190-01054-01 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) 10 flat washer, stainless, #8, .032" thick, .174"id, .375" od nas1149cn832r flat wash...
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Gdu 37x installation manual page b-3 190-01054-01 revision c b.1.2 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 pa...
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Page b-4 gdu 37x installation manual revision c 190-01054-01 3. Connect a flat braid (item 4) to the shield exposed 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...
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Gdu 37x installation manual page b-5 190-01054-01 revision c secondary method: solder a flat braid (item 4) to the shield exposed through the window of the prepared cable assembly (item 2). Ensure a solid electrical connection through the use of acceptable soldering practices. Use care to avoid appl...
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Page b-6 gdu 37x installation manual revision c 190-01054-01 6. Insert newly crimped pins and wires into the appropriate connector housing location as specified by the installation wiring diagrams. 7. Cut the flat braid (item 4) to a length that, with the addition of a ring terminal, will reach one ...
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Gdu 37x installation manual page b-7 190-01054-01 revision c b.1.3 shield termination technique - 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 shields together before c...
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Page b-8 gdu 37x installation manual revision c 190-01054-01 b.1.4 shield termination – method b.1 (quick term) if desired, the drain wire termination (item 3) and the floating shield termination (item 5) can be effectively combined into a “quick term”. This method eliminates the float in the cable ...
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Gdu 37x installation manual page b-9 190-01054-01 revision c secondary method: solder a flat braid (item 4) to the folded back shield on the prepared cable assembly (item 2). Ensure a solid electrical connection through the use of acceptable soldering practices. Use care to avoid applying excessive ...
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Page b-10 gdu 37x installation manual revision c 190-01054-01 b.1.5 shield termination-method b.2 (daisy chain-quick term) 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 together before c...
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Gdu 37x installation manual page b-11 190-01054-01 revision c b.1.6 daisy chain between methods a and b in rare situations where more braids need to be terminated 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 maximum of...
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Page b-12 gdu 37x installation manual revision c 190-01054-01 b.1.7 double-shield termination 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 should be grounded only at one end. All other rest...
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Gdu 37x installation manual page b-13 190-01054-01 revision c b.1.8 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-9. All restrictions set forth for method c.1 ...
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Page b-14 gdu 37x installation manual revision c 190-01054-01 b.1.10 splicing signal wires figure b-10 illustrates that a splice must be made within a 3 inch window from outside the edge of clamp to the end of the 3 inch max mark. Keep the splice out of the backshell for pin extraction, and outside ...
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Gdu 37x installation manual page c-1 190-01054-01 revision c appendix c outline and installation drawings figure c-1.1 gdu 37x outline drawing 77.83 198.8 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 ...
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Gdu 37x installation manual page c-2 190-01054-01 revision c appendix c outline and installation drawings figure c-1.2 gdu panel cutout drawing 4x 4x 45° 45° 4x 4x .160 .160 4.1 4.1 r r .39 .39 typ. Typ. 10.0 10.0 .19 .19 typ. 4.9 1.24 31.5 0 0 0.0 0.0 1.50 1.50 38.0 38.0 3.67 3.67 93.1 93.1 3.67 3....
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Gdu 37x installation manual page c-3 190-01054-01 revision c appendix c outline and installation drawings figure c-2.1 ga 55/55a installation drawing aircraft skin forward fabricate and install doubler plate torque 20 to 25 in-lbs 011-01153-00 as required to comply with applicable ga 55a xm antenna ...
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Gdu 37x installation manual page c-4 190-01054-01 revision c appendix c outline and installation drawings figure c-2.2 ga 56 installation drawing 3.00 76.2 2x 1.2 5 31.8 5.00 127.0 forwar d backing plate outline .83 [21.1 ] 2.59 65.8 .60 15.2 bnc connector front view 011-00134-00 antenna, aviation, ...
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Gdu 37x installation manual page c-5 190-01054-01 revision c appendix c outline and installation drawings figure c-2.3 ga 57x installation drawing .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 connec...
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Gdu 37x installation manual page d-1 190-01054-01 revision c appendix d interconnect drawing (example only) figure d-1.1 gdu 37x interconnect drawing 29.