190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 31-6
31.6.2 Attitude/Heading Failure Troubleshooting
Figure 31-5 Attitude and Heading Failure Indications (Reversionary or Split-Screen PFD)
Before troubleshooting an Attitude Failure, gather answers to the following questions. This information
may be helpful to the installer/pilot, the G3X Dealer, or to Garmin Aviation Product Support in
troubleshooting the failure.
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 "ADAHRS Align: Keep
Wings Level" message (which is indicative of an ADAHRS reset), or the "Attitude Fail" message
(which is indicative of either ADAHRS 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?
• ADAHRS not receiving airspeed
• ADAHRS not receiving any GPS information
• ADAHRS magnetic-field model out of date
• ADAHRS 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. Were there any GPS Alert messages or loss of position lock?
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