Garmin SA01456Wi_D Manual Page 194

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Page 5-70 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
5.15 GRS 77/GMU 44 Troubleshooting
5.15.1 AHRS Common Problems
Symptom Recommended Action
AHRS does not complete
initialization
Ensure that a cell phone or a device using cell phone technology is not
turned on (even in a monitoring state) in the cabin.
Ensure GPS has acquired at least four satellites, has a 3D navigation
solution, and a DOP of less than 5.0. This is particularly important if
this issue appears during ground operation only.
Calibrate the GRS 77.
Check GRS 77 configuration module wiring for damage.
Check GRS 77 connector for bent pins.
If no damage can be found, replace GRS 77 configuration module.
If problem persists, replace the GRS 77.
Attitude appears unstable
Ensure that a cell phone or a device using cell phone technology is not
turned on (even in a monitoring state) in the cabin.
Ensure the four GRS 77 mounting screws are tight. Finger tight is not
sufficient, a screwdriver must be used to verify.
Ensure mounting rack and airframe shelf are secure and all hardware
and brackets are present (CAUTION - do not loosen the mounting rack
hardware to the airframe shelf or the aircraft will need to be re-leveled
and the PITCH/ROLL OFFSET procedure performed)..
Ensure GRS 77 connector is securely fastened and proper strain relief
is provided.
Remove GRS 77 connector and verify there are no bent pins.
Replace the GRS 77.
Contact Garmin for further troubleshooting if required.
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