G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 6-7
190-00682-01 Revision F
6.13 GCU 475
Removal:
1. Use a 3/32” hex drive tool to turn each of the four locking sockets ¼ turn counterclockwise
until they reach their stops.
2. Disconnect backshell assembly from unit.
Reinstallation:
1. Inspect connector(s) for damaged pins.
2. Connect backshell assembly to unit.
3. Hold unit flush with the instrument panel, ensuring locking stud alignment marks are in the
vertical position.
4. Use a 3/32” hex drive tool to turn each of the four locking sockets ¼ turn clockwise. This
may require applying a small amount of forward pressure to engage the ¼ turn sockets.
5. Configure and test the GCU 475 according to Section 7.10.
6.14 GMC 710
Removal:
1. Use a 3/32” hex drive tool to turn each of the four locking sockets ¼ turn counterclockwise
until they reach their stops.
2. Disconnect backshell assembly from unit.
Reinstallation:
1. Inspect connector(s) for damaged pins.
2. Connect backshell assembly to unit.
3. Hold unit flush with the instrument panel, ensuring locking stud alignment marks are in the
vertical position.
4. Use a 3/32” hex drive tool to turn each of the four locking sockets ¼ turn clockwise. This
may require applying a small amount of forward pressure to engage the ¼ turn sockets.
5. Configure and test the GMC 710 according to Section 7.11.
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