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LMM for the Kodiak 100
190-02102-00 Rev.4
4.7.8.8 GRS 79 Operational Modes
To compute valid pitch and roll outputs, the GRS 79 requires valid GPS information or
valid inputs from both the magnetometer and air data computer. To compute valid head-
ing outputs, the GRS 79 requires valid input from the magnetometer. Insufficient inputs
will prevent the AHRS from initializing.
The attitude appears to be
unstable.
• Make sure no cell phone or device using cell phone
technology is turned on in the cabin, even in a
monitoring state.
• Make sure the four GRS 79 mounting screws are
tight. Finger tight is not sufficient. A screwdriver
must be used to verify.
• Make sure the mounting rack and airframe shelf are
secure, and that all hardware and mounting
brackets are present. Do not loosen the hardware
attaching the mounting rack to the airframe shelf, or
the aircraft will need to be re-leveled and the
PITCH/ROLL OFFSET procedure performed.
• Make sure the GRS 79 connector is securely
fastened and that proper strain relief is provided.
• Remove the GRS 79 connector and verify there are
no bent pins.
• Replace the GRS 79.
Table 4-14. AHRS Troubleshooting
Symptom
Recommended Action
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Summary of Contents for Cessna Caravan G1000
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