
G1000 System Maintenance Manual – Diamond DA40/40F Page 7-35
190-00545-01 Revision G
Compare the corresponding timestamps with the prepared test sequence to identify which action
produced the problem. Contact Garmin for assistance in resolving the problem.
NOTE
Two common reasons for a failed magnetometer interference test are: 1) new
equipment is installed in close proximity to the GMU 44 magnetometer, and 2)
an existing or new electronic device has become grounded through the aircraft
structure instead of via the proper ground wire in a twisted shielded pair.
9. Press the ENT key on the PFD to conclude this procedure.
7.7.3 GRS/GMU Testing
The aircraft can now be taxied back and the engine can be shut down for final testing. Restart both
displays in normal mode to conduct final system checks. When the PFD powers up in normal mode, the
AHRS attitude and heading information displayed should become valid within 1 minute of power-up, as
shown in Figure 7-17 (provided both GPS receivers have a valid position; if GPS is unavailable, AHRS
initialization may take as long as 2 minutes).
Figure 7-17. Normal Mode AHRS Check
Test the AHRS reversionary paths by pressing the red reversionary mode button on the audio panel.
Ensure that both displays have valid AHRS information, as shown in Figure 7-18.
Figure 7-18. Reversionary Mode AHRS Information
On the PFD, open the ALERT window and verify there are no GRS or GMU MANIFEST or
configuration errors. If no other service is to be performed, continue to the return-to-service checks in Section 8.
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