CHAPTER 4 REFERENCE GUIDE
Page 4-7
091-00019-001 REV B
EFD1000 C3 Pro PFD Pilot’s Guide
Two minutes after detection, a FREE GYRO MODE annunciation will be presented across
the HSI, indicating the heading system no longer can be aligned with magnetic north.
Some precession of the heading is possible, especially during abrupt maneuvers. If the
condition persists for four more minutes (six minutes total), the attitude and heading
indicators will be removed and replaced with red X indications. When the conditions
causing Free Gyro Mode are no longer present, attitude and heading indications will be
restored after an automatic AHRS reset.
4.1.5. Degraded ADAHRS Performance
For Degraded ADAHRS Performance, reference the following:
• Sections 6.1. Pitot/Static System Blockage
• Sections 6.8. In-Flight AHRS Reset
• Geographic Limitations in the Aircraft Flight Manual Supplement that was
installed in the aircraft with your PFD.
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