Garmin GDL 90 Installation Manual

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Installation ProceduresGDL 90 Installation Manual 560-1049-00 Rev B 2-32.5 EQUIPMENT MOUNTING2.5.1 CABLING AND WIRINGWiring should be installed in accordance with AC 43.13-1B Chapter 11. When wire separation cannot beachieved, the following issues should be addressed:• The cable harness should not be located near flight control cables and controls, high electricalcapacity lines or fuel lines• The cable harness should be located in a protected area of the aircraft• Do not route cable near high-energy sourcesRefer to the interconnection diagrams in Appendix C for the appropriate wiring. Once the cableassemblies have been made, attach the cable connectors to the rear of the mounting tray. Route the wiringbundle as appropriate. Use 22 to 24 AWG wire for all connections except for power. Use 20 AWG forpower/ground. Avoid sharp bends.2.5.2 MOUNTING TRAY INSTALLATIONThe GDL 90 does not require forced-air cooling; however, when mounting the GDL 90, avoid locatingthe GDL 90 near sources that produce high levels of heat. The tray can be installed in a variety oflocations, such as the electronics bay, under a seat or behind the rear baggage area. Refer to Figure 2-1and Figure 2-2 for suggested location. Leave sufficient clearance between the GDL 90 and anyobstruction. Install tray in accordance with AC 43.13-2A Chapter 2 Radio Installations. Tray should bemounted to a surface known to have sufficient structural integrity to withstand additional inertia forcesimposed by a 6.4-pound unit. If it is necessary to build a shelf or bracket to mount the GDL 90 tray or itis not certain that the chosen location is of sufficient structural integrity, refer to Appendix D.Refer to Figure 2-3 for the GDL 90 tray dimensions. The tray can be mounted vertically using four 8-32pan head screws (MS35206, AN526 or equivalent.) It can also be mounted horizontally using four 6-32100° counter-sunk flathead screws (MS24693, AN507R or equivalent.) Install tray in accordance withAC 43.13-2A Chapter 2 Radio Installations. Ensure that the GDL 90 chassis have a ground path to theairframe by having at least one mounting screw in contact with the airframe. If more water-resistance isdesired, tray should be installed in the upright vertical orientation only, otherwise, tray may be mountedin either vertical or horizontal orientation.After the cable assemblies are made and wiring installed to the mounting tray back plate, route wiringbundle as appropriate. Use cable ties to secure the cable assemblies and coax to the holes provided in theside of the connector plate to provide strain relief for the cable assemblies. The cable shields should begrounded directly to a lug mounted to one of the holes on the side of the connector plate, keeping theground leads to a maximum of 3 inches long.The APM may be fastened to the back of the tray next the 37-pin connector using cable ties through anyof the four holes provided in the backplate. Refer to Figure 2-4. The APM wire length must be 4 inchesmaximum.Optional cover is provided for installations that need extra moisture protection. Install cover to aft sideof tray using 4 screws that are part of the mounting tray. Refer to Figure 2-5.