Grs 77 Ahrs; Gmu 44 Magnetometer - Garmin Diamond DA 40 Maintenance Manual

6.8

GRS 77 AHRS

Removal:
1. Remove baggage compartment floor, then remove the baggage compartment.
2. Disconnect the AHRS connector.
3. Remove the four Phillips thumbscrews with a screwdriver and set them aside.
4. Gently lift the GRS 77 from the mounting plate. (If the mounting plate is removed, the GRS 77
must be re-calibrated. See Section 7.7.3)
Replacement:
1. Place the GRS 77 on the mounting plate, ensuring the orientation is correct.
2. Fasten the unit to the plate using the Phillips thumbscrews.
3. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any
damage. Connect the connector to the GRS 77.
4. Calibrate, and test the GRS 77 according to Section 7.7.
6.9

GMU 44 Magnetometer

Removal:
1. Remove GMU access plate below starboard wing by unscrewing the three Phillips screws.
2. Carefully lower the plate, which contains the GMU 44, a phenolic spacer, and the GMU rack.
3. Disconnect the wiring harness.
Replacement:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any
damage. Connect the wiring harness to the GMU 44.
2. Place the GMU in the bay and secure the plate with the 3 Phillips screws.
3. Calibrate and test the GMU 44 according to Section 7.7.
G1000/DA 40 System Maintenance Manual
190-00303-03
Page 6-5
Revision 6