System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1Page 6-20 Rev. 66.9 GPS/SBAS Antenna Cable OverbraidThe following removal and replacement steps are provided as guidance for replacing the cable overbraidassembly. See Figure 6-11.Removal1. Gain access to the GPS/SBAS antenna cable.2. Disconnect the overbraid terminal lug from the shield block.3. Disconnect the GPS coaxial cable connector at the GTN backplate.4. Gain access to the GPS antenna and disconnect the antenna end of the coaxial cable.5. Refer to the wire routing diagram and remove the entire cable assembly from the aircraft.6. Remove the two visible electrical tie down connectors.7. Unfold the overbraid that is doubled over and remove the remaining tie down connector.8. Remove the antenna cable from the overbraid and visually inspect the cable insulation for damage.ReplacementNOTENote: The length of overbraid required for replacement of the assembly will be the lengthof the GPS/SBAS antenna cable plus 6 inches. Refer to Figure 6-11 before beginning thereinstallation steps below.1. If the antenna cable insulation shows signs of damage, replace the cable.2. Test the GPS coaxial cable for continuity. Replace the cable if it fails the continuity test.3. Slide the new overbraid over the entire length of the GPS/SBAS antenna cable.4. Roll back approximately 1.5 inches of the overbraid end at the antenna end.5. Leaving the rolled-back portion free, secure the antenna end of the overbraid around theGPS/SBAS antenna connector with an electrical tie-down strap.6. Fold the free overbraid ends back over the tie-down strap and secure them to the cable with twoadditional tie-down straps.7. Reinstall the cable in the aircraft and connect the cable to the GPS antenna.8. At the GTN end of the overbraid, comb out a maximum of two inches of braid, twist it, cut tolength if necessary, and terminate with a #10 terminal lug.9. Connect the remaining end of the antenna cable to the GTN and terminal lug to the P1001 shieldblock ground.
