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Page 9-4 G3X Installation Manual –Troubleshooting
Revision A 190-01115-01
9.3.1 Attitude/Heading Failure Troubleshooting
Prior to troubleshooting an Attitude Failure on-board the aircraft, gather information from the pilot by
asking the following questions.
1. What specifically was the nature of the failure? Was it a Red-X of only heading, only
pitch/roll, or both?
2. If there was a Red-X of pitch or roll information, did the PFD display the "AHRS Align:
Keep Wings Level" message (which is indicative of an AHRS reset), or the "Attitude Fail"
message (which is indicative of either AHRS invalidating its output, or a communication path
failure)?
3. What exactly was the aircraft doing in the two minutes that preceded the failure (taxing on
the ground, flying straight-and-level flight, turning, climbing, etc)? If the problem occurred
on the ground, was it within 100 feet of a hanger using GPS repeaters?
4. How long did the failure last? Was it brief or sustained? Was it repetitive in nature? If it
was repetitive, about how many times did it happen? Did it happen on more than one day?
5. Was the problem correlated with a specific maneuver or a specific geographic area?
6. Can the problem be repeated reliably?
7. Were any of the following message advisory alerts observed (must navigate to the INFO page
and press the MSG softkey to see them) within an hour of the occurrence of the problem?
• AHRS not receiving airspeed
• AHRS not receiving any GPS information
• AHRS magnetic-field model out of date
• AHRS extended operation in no-GPS mode
8. Did the onset of the problem occur shortly after a software upload to one or more of the G3X
LRU’s, or shortly after a repeat of the magnetometer calibration procedure?
9. Was a cell phone on in the aircraft at the time?
10. Were there any GPS Alert messages or loss of position lock?