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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 6-1
6 EQUIPMENT REMOVAL AND REINSTALLATION
This section describes how to remove and replace equipment associated with this STC. After removal and
reinstallation, LRUs must be configured and tested as described in Section 7.
CAUTION
When removing and/or replacing a GTN, GMA 35, or any other item under the scope of
the STC installation, always ensure that the aircraft power is off. Unplug any auxiliary
power supply.
6.1 GTN
Removal
1. Locate and pull the GTN GPS/NAV and COM (635/650/750 only) circuit breakers
.
2.
Locate the unit retention mechanism access hole at the bottom left corner of the unit face.
3. Insert a 3/32" hex tool into the access hole and turn the fastener counterclockwise until the unit
is
fo
rced out about 3/8" and can be freely pulled from the rack.
4. Slide the GTN unit out of the rack.
Reinstallation
1. Ensure that the GTN GPS/NAV and COM circuit breakers are pulled.
2. Slide the GTN straight into the rack until it stops about 1" short of the fully seated position.
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 the bezel until the unit is firmly seated in the rack.
4. Once the GTN is reinstalled, verify that the unit power-up self test sequence is success
fully
completed and no failure messages or configuration error messages are annunciated. Section 6.1.1
outlines t
he power-up self-test sequence.
NOTE
It may be necessary to insert the hex drive tool into the access hole and turn the cam
mechanism 90 degrees counterclockwise to ensure correct position prior to placing the
unit i
n the rack.
CAUTION
Be sure not to over-tighten the unit into the rack. The application of hex drive tool torque
exceeding 15 in-lbs can damage the locking mechanism.