Garmin GTX 330D Maintenance Manual page 83

6.3.4 Garmin Altitude Encoder
WARNING
Ensure that the aircraft power is off before removal or reinstallation of the GTX 3X5/3X5R.
Unplug any auxiliary power supply.
This section contains procedures and requirements for removal and installation of the Garmin altitude
encoder equipment installed under STC SA01714WI. After removal and reinstallation, the
GTX 3X5/3X5R return to service procedures must be performed in accordance with section 9.
Removal
1. Remove the transponder. Refer to section 6.3 for details.
2. Remove the static line attached to the altitude encoder.
3. Disconnect wiring harness at the altitude encoder.
4. Remove two screws securing the unit to the back plate.
Reinstallation
1. Secure altitude encoder to back plate assembly with two screws, torque to 8 in-lbs.
2. Connect wiring harness to altitude encoder.
3. Secure the static line to the altitude encoder using standard practices.
4. Install transponder. Refer to section 6.3 for details.
5. Complete the applicable return to service procedures in section 9.
6. Complete the static system and transponder checks described in section 8.6.
190-00734-11
Rev. 6
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Page 6-14