Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air Page 6-5
190-00915-01 Revision 8
6.8 GRS 77 AHRS
Removal:
1. Gain access to the forward avionics compartment in the nose of the aircraft.
2. Disconnect the AHRS connector.
3. Loosen the four Phillips thumbscrews with a screwdriver until they are free from the rack.
4. Gently lift the GRS 77 from the mounting rack. (If the mounting rack is removed, the GRS 77
must
be re-calibrated. Do not loosen mounting bolts. See Section 7.7)
Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any damage.
2. Place the GRS 77 on the mounting plate, ensuring the orientation is correct.
3. Fasten the unit to the plate using the Phillips thumbscrews.
4. Connect the connector to the GRS 77.
5. Calibrate and test the GRS 77 according to Section 7.7.
6.9 GMU 44 Magnetometer
NOTE
The GMU 44 magnetometers may be located in the tailcone or in the horizontal
stabilizer.
Always use a non-magnetic Phillips screwdriver when removing or installing all screws
near the magnetometers.
Reference the “Magnetometer Install” and “Wire Harness Installation, Tail” drawings
listed in Table 1-2 for more details.
For Tailcone Location:
Removal:
1. Disconnect electrical wiring harnesses and remove the tailcone.
2. Remove three screws connecting the unit to the aircraft mounting bracket.
3. Remove the cable tie attaching the magnetometer pigtail harness to the shelf.
Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any damage.
2. Fasten the GMU to the aircraft mounting bracket.
3. Attach the magnetometer pigtail harness to the shelf with a cable tie
4. Reinstall tailcone and connect the electrical wiring harnesses.
5. Calibrate and test the GMU 44 according to Section 7.7.