Degraded Adahrs Performance - Aspen Avionics Evolution Backup Display EFD1000 Pilot's Manual

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 EBD.
091-00027-001 REV A
091-00027-001 Rev A EBD Pilots Guide V&H .indb 7
Evolution Backup Display Pilot's Guide
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