Garmin GTX 330D Maintenance Manual page 79

6.3.2 GTX 3X5R with Standard or GX000 System Rack Mount
WARNING
Ensure that the aircraft power is off before removal or reinstallation of the GTX 3X5R.
Unplug any auxiliary power supply.
This section contains procedures and requirements for removal and installation of GTX 335R/345R
equipment installed using a standard remote mount or GX000 system rack mount. After removal and
reinstallation, the GTX 335R/345R return to service procedures must be performed in accordance with
section 9.
Removal
1. Gain access to the transponder.
2. Insert the hex drive tool into the access hole on the unit face and rotate counterclockwise until the
unit is forced out about 3/8 inch.
3. Grab the pull-tab on the front of the unit and pull the unit straight out of the rack.
Reinstallation
CAUTION
Be sure not to over-tighten the unit into the rack. Torque exceeding 8 in-lbs can damage
the locking mechanism.
NOTE
It may be necessary to insert the hex drive tool into the access hole and rotate the cam
mechanism 90° counterclockwise to ensure correct position prior to placing the unit in the
rack.
1. Visually inspect the connectors and pins to ensure they are not bent or damaged. Repair any
damage.
2. Slide the GTX 3X5 straight in the rack until it stops, about one inch short of the final position.
3. Insert a 3/32-inch hex drive tool into the access hole at the bottom of the unit face.
4. Turn the hex tool clockwise while pressing on the left side of the bezel until the unit is firmly
seated in the rack.
5. Count the number of complete revolutions the hex screw can be turned until it cannot turn any
more. Be careful not to over-tighten. Three turns is the minimum for proper installation. If fewer
than three turns are possible, ensure nothing obstructs the unit from fully seating in the rack.
6. Complete the applicable return to service procedures in section 9.
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Rev. 6
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Page 6-10