Gma 35 - Garmin GTN 6 Series Maintenance Manual

5.2 GMA 35

CAUTION
Avoid overtightening the unit into the rack. The application of hex drive tool torque
exceeding 15 in-lbf can damage the locking mechanism.
Removal
1. Remove power from the audio panel.
Bell and MD Helicopter Models: This is accomplished by pulling the audio panel circuit breaker.
Eurocopter Models: Power is removed from the GMA by switching off the avionics master relay.
2. Ensure that the GTN(s) are not receiving power prior to removal of the audio panel.
3. Remove the GTN 7XX.
4. GMA 35c only: Remove the Bluetooth antenna cable.
5. Locate the GMA 35 unit retention mechanism access hole at the bottom center of the unit face.
6. Insert a 3/32" hex tool into the access hole and turn the fastener counterclockwise until the unit is
forced out about 3/8 inches and can be freely pulled from the rack
7. Slide the GMA 35 unit out of the rack.
Replacement
1. Ensure that the audio panel and the GTN units are not receiving power.
2. Slide the GMA 35 straight into the rack until it stops.
3. Insert a 3/32" hex drive into the unit retention mechanism access hole at the bottom of the unit face
and turn the tool clockwise while pressing on the face of the unit until the GMA 35 is firmly seated
in the rack.
4. GMA 35c only: Re-install the Bluetooth antenna cable. Torque to 8-10 in-lbf using a 5/16" SMA
torque wrench.
5. Re-install the GTN 7XX.
6. Verify there are no failure messages or annunciations when the GTN and audio panel are powered
on.
190-01007-B1
Rev. 4
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Page 5-8