Installation Procedure190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 9 Page 4-104.6 Coax Cable InstallationNOTEMake sure the length is set for the necessary cable loss. Some antennas have minimum cable lossspecifications, that may need a cable longer than the physical run in the aircraft.To install coaxial cables:1. Route the cable to the radio rack location keeping in mind the recommendations of section 3.17.2. Attach the cable in accordance with AC 43.13-1B chapter 11, section 11.3. Trim the cable to the applicable length.4. Install the connectors to the cable per the manufacturer’s instructions.4.7 Equipment Rack Installation4.7.1 Panel Mount UnitsCAUTIONEXERCISE CAUTION WHEN INSTALLING THE RACK IN THE INSTRUMENT PANEL. DEFORMATION OF THERACK WILL MAKE IT DIFFICULT TO INSTALL AND REMOVE THE GTX 3X5.NOTEIf the front lip of the mounting rack is behind the surface of the aircraft panel, the GTX 3X5 connectorsmay not fully engage. For more information refer to appendix B.NOTEMake sure no screw heads or other obstructions prevent the unit from fully engaging in the rack. Fordrawing dimensions necessary to prepare the cutouts for the GTX 3X5 unit, refer to figure B-9. Fordrilling the mounting holes, the GTX 3X5 mounting rack may be used as a template.NOTEStep 3 can be done before or after the wire harness is installed in the aircraft.1. Install the rack in a rectangular hole (or gap between units) in the instrument panel, typically in the radio stack.The lower front lip of the rack should be flush with, or extend slightly beyond, the finished aircraft panel.2. Use six #6-32 flat head screws and self-locking nuts to install the rack in the aircraft panel. The screws areinserted from the inside through holes in the sides of the rack.3. Use provided screws to attach the connector(s) to the backplate.4. Use two #4-40 flat head screws to attach the GAE to the backplate, if used. Refer to figure B-11.5. Align the backplate so the backplate screw heads pass through the keyed holes in the back of the rack.6. Connect the wire harness to the GAE, if used. Refer to figure B-9.7. Slide the backplate to the left (viewing from the front of the unit) until an audible click is heard.8. Attach the backplate by tightening the four #4-40 screws.
