GTN 6XX/7XX Part 27 AML STC Maintenance Manual 190-01007-B1Page 5-10 Rev. 15.3 SD CardCAUTIONHandle the SD cards carefully. Do not touch the connector edge of the SD card.To replace the data card, complete the following steps:1. Ensure that the GTN is turned off.2. Remove the data card by pressing the card until it disengages and then pull the SD card to extractfrom the unit.3. With the label facing right, insert the new SD card by pushing the card straight into the slot andpress until it is fully inserted.5.4 GPS/WAAS AntennaRemoval1. Verify that the power to the GTN unit is off.2. Disconnect the coaxial antenna connector(s) on the antenna.3. Remove the sealant from the antenna and fuselage.4. Remove the mounting screws on the antenna.5. Retain the screws for reinstallation.6. Remove the antenna.Reinstallation1. Clean the area of debris or excess sealant.2. Install the antenna and install four mounting screws. Torque mounting screws to specified valuecalled out in the antenna installation instructions.3. Verify the resistance is 2.5 mΩ or less between the antenna connector body and a nearby exposedportion of conductive aircraft structure.4. Re-seal the antenna to the fuselage.5. Connect the antenna connector(s) to the antenna ensuring each connecter is secured.5.5 NAV Antenna Cable DiplexerRemoval1. Disconnect the coaxial connectors from diplexer, taking note of which coaxial connectors areconnected to each port on the diplexer.2. Remove the mounting screws and diplexer.Reinstallation1. Reinstall the diplexer over the existing hole pattern and reinstall fasteners. Torque fasteners within22 to 25 in-lbs.2. Reconnect the coaxial connectors to the diplexer.
