SUPPLEMENT SG-3
CHAPTER 31 - INDICATIONG SYSTEM
GRS 77 AHRS REMOVAL/INSTALLATION
Removal
1. Disconnect the GRS 77 connector.
2. Loosen the four Phillips thumbscrews with a screwdriver.
3. Gently lift the GRS 77 from the mounting plate (if the supports for the mounting plate
are removed, the GRS 77 must be recalibrated). See Section 5.6 in the G500 or the
G600 Installation Manual.
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. Recommended torque is
22‐25 inch pounds.
3. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair any
damage.
4. Connect the connector to the GRS 77, ensuring that each slide lock is secured on both
sides.
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