Dual AHRS Failure (Red “X” – Heading and Attitude Indicators)
If both AHRS systems fail, check that both AHRS circuit breakers are pushed
in. If one or both are open, try resetting them (push in). If they pop back out
DO NOT reset them. Attitude and heading information will not be displayed
on the PFD; therefore, the standby attitude indicator and magnetic compass
will have to be referenced for attitude and heading information. The NAV
CDI will still function, and may be used for navigation. Utilize the MFD for
additional situational awareness.
The following annunciations will be shown on the PFD:
HDG NO COMP – No source for heading information, not able to compare to
second source.
ROL NO COMP – No source for roll information, not able to compare to second
source.
PIT NO COMP – No source for pitch information, not able to compare to second
source.
BOTH ON AHRS 2 (or 1) – Both PFDs were receiving AHRS 2 (or 1) information
when the other AHRS failed.
BOTH ON ADC2 – Both PFDs were only receiving ADC 2 information when the
other AHRS failed.
HDG FAULT – AHRS 1 (or 2) magnetometer fault has occurred.
Figure 3A-2 – Dual AHRS Failure (No. 1 PFD Shown)
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