Garmin GTX 23 Installation Manual

Also see for GTX 23: Installation manual

Contents

Garmin GTX 23 Installation Manual Manual pdf 23 page image

190-00906-01 GTX 23 Installation ManualRev. C Page 2-52.4.1 Cable Routing ConsiderationsAfter 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. When 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).The GTX 23 can be mounted using either a modular rack or a stand-alone rack. Ensure that the GTX 23chassis has a ground path to the airframe by having at least one rack mounting screw in contact with theairframe.The racks can be installed in a variety of locations, such as the electronics bay, under a seat or on anavionics shelf behind the rear baggage area. Refer to Figure 2-4 for suggested locations. The racks shouldbe mounted to a surface known to have sufficient structural integrity to withstand additional inertia forcesimposed by the GTX 23 unit, rack, and connectors (see Section 1.7.1 for weight information). If it isnecessary to build a shelf or bracket to mount the GTX 23 racks, or it is not certain that the chosen locationis of sufficient structural integrity, refer to Appendix A for validation of rack mounting structures anddetermining static load capability. Leave sufficient clearance between the GTX 23 and any obstruction.Consider installing the rack in accordance with AC 43.13-2B Chapter 2 “Communication, Navigation, andEmergency Locator Transmitter System Installations”.2.6.1 Stand-alone Rack ConsiderationsFigures 2-2, D-1, and D-2 show the GTX 23 remote-mounted stand-alone rack. Figure D-1 gives the stand-alone rack dimensions for the GTX 23. The rack can be mounted vertically using four 8-32 pan headscrews (MS35206, AN526 or other approved fastener). It can also be mounted horizontally using four 6-32100° counter-sunk flathead screws (MS24693, AN507R or other approved fastener). If more water-resistance is desired, the rack should be installed in the upright vertical orientation only, otherwise, the rackmay be mounted in either vertical or horizontal orientation.2.6.2 Modular Rack ConsiderationsFigures 2-3, D-3, and D-4 show the GTX 23 remote-mounted modular rack. Figure D-3 gives the modularrack dimensions for the GTX 23. The modular rack can be mounted in any orientation and must be securedto the airframe using a minimum of eight 6-32 100° counter-sunk flathead screws (MS24693, AN507R orother approved fastener), two per position as indicated in Figure D-4.