Garmin G1000 NXi, Дополнительное руководство по обслуживанию, Страница: 91 / 171

G1000 Supplemental Maintenance Manual Page 5-23
Textron Nav III Series Revision 3
190-02128-04
5.9 GSU 75 and GMU 44 Troubleshooting
For troubleshooting of the GRS 77, refer to the G1000 Nav III Line Maintenance Manual
AHRS Symptoms
Symptom Recommended Action
ADAHRS 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 GSU 75.
•
Check GSU 75 configuration module wiring for damage.
•
Check GSU 75 connector for bent pins.
✓
If no damage can be found, replace GSU 75 configuration module.
✓
If problem persists, replace the GSU 75.
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. (Wi-Fi and Bluetooth may be
operational)
•
Ensure the two mounting jack 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 the GSU 75 connector is securely fastened and proper strain relief is
provided.
•
Remove the GSU 75 connector and verify there are no bent pins.
•
Replace the GSU 75.
•
Contact Garmin for further troubleshooting if required.