5-16 Abnormal Procedures
TRIMMING UP/DOWN
Failure Indication:
If the DFC-PFD system recognizes that trim has been running for
an excessive duration, a yellow “TRIMMING UP” or “TRIMMING
DN” message is displayed on the PFD.
Functionality Lost:
No functionality has been lost. In all cases, the trim system can
be manually overridden with pilot-controlled control stick/yoke
inputs.
Recommended Pilot Action:
Monitor the alert and if it is removed within a few seconds, no
further action need be taken – the autopilot is operating normally.
If the alert is present for more than a few seconds, consider
disconnecting the autopilot, manually trim the aircraft accordingly
and if autopilot operations are still desired, re-engage the
autopilot in the desired mode.
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