3.10.6 PFD FAILURES
In all cases:
1. Use backup instrument for attitude, airspeed, and altitude reference
2. Refer directly to the navigation source for navigation information (such
as GPS).
3. Depending on the failure, consider resetting PFD using on-off button or
both PFD1/A and PFD1/B circuit breakers simultaneously.
PFD failure is indicated by the loss of displayed information on the PFD,
including a blank, frozen, or unresponsive display.
AHRS failure is indicated by the removal of the attitude/heading information
and a red X on the PFD. Rate-of-turn information (heading trend vector) will
not be available. A heading failure will also occur as described in Section 3.2.1.
ADC failure is indicated by:
- Red X over the airspeed and altitude tapes
- Yellow X over the vertical speed tape
- Dashed out TAS and OAT fields
Wind calculations will also be unavailable. If valid GPS data is available, the PFD
will automatically revert to display GPS calculated altitude relative to mean sea
level. GPS altitude is displayed at the top of the altitude tape.
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