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PA-46-350P, MALIBU
SECTION 3 - EMERGENCY PROCEDURES (continued)
RED HDG ANNUNCIATION
Red HDG annunciation indicates a failure in the compass system by
removing the lubber line and replacing it with a red HDG flag. Simultaneously,
the course pointer head and tail will declutter leaving the d-bar. (The d-bar will
reorient on the face of the instrument providing horizontal deviation in the
manner of a CDI.) The autopilot will disengage, if engaged.
If the compass card position is wrong, ADF
bearing relative to the compass card, and RMI
and MAP presentations relative to the nose of the
aircraft will be in error. These presentations
should be used with caution at the discretion of
the pilot, or declutter. Reslave the compass card
or slew the compass card to match magnetic
compass if possible.
During a heading failure, the automatic Back Course function normally
provided by the EHI 40 system is inhibited.
Pull and reset the DG and EFIS circuit breakers. If compass information is
not restored, continued flight must be conducted by reference to the copilot DG
or magnetic compass. Without heading information, the autopilot will not
couple HDG, NAV, or APR, but can be used for attitude or altitude hold. If
valid compass information is restored, the HDG flag will be replaced by the
lubber line and normal operation of the EHI 40 may continue.
Some avionics equipment other than the EHI 40,
because of their internal circuit logic, will not
restore heading information if a failure occurred
in the compass reference voltage (EFIS circuit
breaker)
manufacturer's operating manual for procedure to
restore heading information.
ISSUED: FEBRUARY 23, 1999
CAUTION
NOTE
circuit.
Consult
SECTION 9
SUPPLEMENT 8
component
REPORT: VB-1710
5 of 26, 9-47
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