Gsm 86 And Gsm 9100 Servo Gearbox; Gcu 477 - Garmin G1000 System Maintenance Manual

6.12

GSM 86 and GSM 9100 Servo Gearbox

Removal:
1. Remove the desired servo(s) per Section 6.11.
2. For the Roll, Pitch and Yaw Servos: remove the servo bridle cables from the control cable
clamps. For the Pitch-Trim Servo: disconnect the servo cable at the forward turnbuckle and aft
terminal.
3. Use a socket or open-wrench to loosen and remove the servo attachment bolts.
4. Carefully remove the servo gearbox(es).
5. Remove the cable retention pins and ring (or cover) and then remove the servo cable from the
capstan.
Reinstallation:
1. Ensure cable retention pins are oriented correctly. Follow the installation instructions provided in
the respective servo installation drawing(s) listed in Table 1-2.
2. If no other maintenance is to be performed, reinstall the servo(s) per Section 6.11.
6.13

GCU 477

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 pedestal, 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 477 according to Section 7.10.
Page 6-2
Revision 1
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01