Garmin GTX 23 ES Installation Manual

Also see for GTX 23: Installation manual

Contents

Garmin GTX 23 ES Installation Manual Manual pdf 20 page image

Page 2-4 GTX 23 Installation ManualRevision A 190-00906-012.4.1 Cable Routing ConsiderationsWhen routing cables, observe the following precautions:• All cable routing should be kept as short and as direct as practical.• Avoid sharp bends to prevent insulation from being breached.• Avoid routing close to sharp edges to prevent insulation from being breached due to vibration orhandling the cable.• Avoid routing cables near power sources (e.g., 400 Hz generators, trim motors, etc.) or near powerfor fluorescent lighting.• Avoid routing antenna cables near DME, TCAS, radar altimeter, and ADF antenna cables (allow atleast a 12-inch separation).2.5 Cooling AirCooling air is generally not required. However, if the unit is located in a confined space or near a source ofheat, cooling air is recommended for maximizing the life of the GTX 23. A 5/8 inch air fitting is providedon the rear of the backplate for the purpose of admitting cooling air. If a form of forced air cooling isinstalled, make certain that rainwater or condensation cannot enter and be sprayed on the equipment.2.6 GTX 23 Mounting RequirementsThe GTX 23 mounting surface must be capable of providing structural support and electrical bond to theaircraft to minimize radiated EMI and provide protection from High-Intensity Radiation Fields (HIRF).Figures 2-2, D-1, and D-2 show the GTX 23 remote-mounted stand-alone rack. The remote rack can beinstalled in a variety of locations, such as the electronics bay, under a seat or on an avionics shelf behindthe rear baggage area. Refer to Figure 2-3 for suggested locations. Leave sufficient clearance between theGTX 23 and any obstruction. Consider installing the rack in accordance with AC 43.13-2B Chapter 2“Communication, Navigation, and Emergency Locator Transmitter System Installations”. The rack shouldbe mounted to a surface known to have sufficient structural integrity to withstand additional inertia forcesimposed by a 4.3-pound (1.95 kg) GTX 23 unit, rack, and connectors (see Section 1.7.1 for weightinformation). If it is necessary to build a shelf or bracket to mount the GTX 23 stand-alone rack, or it is notcertain that the chosen location is of sufficient structural integrity, refer to Appendix A for validation ofrack mounting structures and determining static load capability.Figure C-1 gives the stand-alone rack dimensions for the GTX 23. The rack can be mounted verticallyusing four 8-32 pan head screws (MS35206, AN526 or other approved fastener). It can also be mountedhorizontally using four 6-32 100° counter-sunk flathead screws (MS24693, AN507R or other approvedfastener). Ensure that the GTX 23 chassis has a ground path to the airframe by having at least onemounting screw in contact with the airframe. If more water-resistance is desired, the rack should beinstalled in the upright vertical orientation only, otherwise, the rack may be mounted in either vertical orhorizontal orientation.After the cable assemblies are made and wiring installed to the rack back plate, route wiring bundle asappropriate. Use cable ties to secure the cable assemblies and coax to provide strain relief for the cableassemblies.