Garmin GTX 330D Maintenance Manual page 81

6.3.3 GTX 3X5R with Vertical Mount
CAUTION
Before removal or reinstallation of the GTX 3X5R, ensure the aircraft power is off. Unplug
any auxiliary power supply.
This section contains procedures for removal and installation of the GTX 335R/345R equipment installed
using a vertical mount. After removal and reinstallation, the GTX 335R/345R return to service procedures
must be performed.
Removal
1. Gain access to the transponder.
2. Remove the two captive screws securing the back plate to the transponder body using a 3/32" hex
tool.
3. Carefully remove the back plate and connector assembly from the unit.
4. While pulling, turn the large knob at the base of the unit counterclockwise until it can be pulled off
the tab at the base of the unit.
5. Slide the unit forward and up until it clears the base plate.
Installation
1. Tilt the unit so that the toe of the GTX 3X5 shoe fully engages the base plate.
2. Ensure that the unit is fully engaged and in line with the base.
3. Lift the large knob on the install rack up and over the round protrusion on the base plate.
4. Turn the large knob clockwise until the unit is secure.
5. Carefully install the back plate onto the unit.
6. Secure with the two captive screws using a 3/32" hex tool.
7. Complete the applicable return to service procedures.
190-00734-11
Rev. 6
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Page 6-12