Abnormal Procedures
5-7
ALERTS
In addition to system failures as noted above, there are several
alerts that may affect DFC autopilot and subsequent pilot
operations. The following list generates a yellow caution lamp and
associated R6 LSK messages:
AHRS Miscompare
Dual AHRS system
: The system has
detected a roll or pitch miscompare
between the two AHRS. The autopilot will
disconnect upon initiation of this
miscompare alert and will generate a
“GYRO MISCOMPARE” aural alert.
Single AHRS system
: The system has
detected a roll miscompare between the
AHRS and the turn coordinator. The
autopilot will not disconnect upon initiation
of this miscompare alert but will generate
a “GYRO MISCOMPARE” aural alert.
In either case, evaluate the accuracy of
the IFD AHRS solution by comparing the
PFD display to the backup gauges, and if
in VMC conditions, the out-the-window
view. If it can be concluded that the PFD
is accurate, consider re-engaging the
autopilot, as required and continue
standard autopilot operations but be
vigilant knowing that the AHRS-AHRS or
AHRS-TC comparator has noted a sensor
miscompare.
AP Audio Unavail
The autopilot aural alerts are unavailable.
Apply extra vigilance to the autopilot
annunciator status messages along the
top of the PFD due to the absence of the
associated aural alerts. After the flight,
notify an Avidyne Service Center or
Avidyne Customer Support for a repair
action.
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