Abnormal Procedures
5-3
LOSS OF PFD DISPLAY (AHRS STILL OPERATIONAL)
Failure Indication:
A loss of PFD display condition is identified by a display being
unreadable but PFD bezel button lights are still lit.
Functionality Lost:
Under these conditions, if there are no readable PFD displays
left, there is a degradation in the ability to enter some autopilot
commands/bug settings. Note that in this case, the internal
components of the PFD are all fully functional, including the
AHRS.
Recommended Pilot Action:
Use the autopilot sync capability and count clicks to accomplish
the intended action. For example, to accomplish an altitude
capture, one technique is to press the “ALT” button on the
autopilot control panel to achieve altitude hold mode. Then push
to sync either the “VS” or “IAS” knobs on the autopilot control
panel and twist the knob in the desired direction, counting each
click of the knob (e.g. 5 counter clock-wise clicks of IAS results in
5 knots less than current IAS, each click of the VS knob results in
50 fpm). At this point, engage either “IAS” or “VS” to
climb/descend and then press “ALT” again when the standby
altimeter shows the desired altitude.
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