Aspen Avionics Evolution EFD1000 VFR PFD - Degraded ADAHRS Performance

CHAPTER 4 REFERENCE GUIDE
EFD1000 VFR PFD Pilot’s Guide
Page 4-7
091-00028-001 ( )
Two minutes after detection, a FREE GYRO MODE annunciation will be presented across
the Navigation display, 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.