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10. Ensure the GRS is fastened down tightly in its mounting rack and the mounting
rack is not loose. 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.
11. Cycle GRS power to restart initialization.
12. Ensure the GPS has acquired at least four satellites, has a 3D navigation
solution, and a DOP of less than 5.0. This is particularly important for an
ATTITUDE FAIL that appears during ground operation only.
13. Perform an Engine Run-Up Test to find whether or not engine vibration is causing
the GRS to invalidate outputs or reset.
14. Perform a Magnetic Interference Test to find whether or not there is significant
magnetic interference from some device on the aircraft.
15. Replace the GRS.
16. If the problem persists, replace the GRS configuration module.
17. Contact Garmin Aviation Support for additional assistance if the condition is not
resolved.
4.7.8.11 Heading Red X
For heading issues, a heading red X (steady or intermittent) is the typical fault indication.
Normally there will also be a green check mark displayed on the System Status page for
the GMU, indicating the GRS 79 and the GMU 44/44B are operating.
In addition to the troubleshooting information provided in the beginning of this section,
maintenance personnel should be aware of the following AHRS system characteristics
during ground operation that could cause the red X.
This is important if the operator finds the red X only occurring during ground operations.
GRS 79 ground operation is heavily dependent on GPS data inputs. Correct any GPS
performance problems (i.e. interference caused by some types of cell phones, Wi-Fi,
GPS repeaters, or any other device that transmits in the area; before troubleshooting the
GRS 79 or GMU 44B. For GPS data to be considered valid, the receiver must be tracking
at least four satellites and have a 3D GPS Solution.
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