weather theoryFAA-published sample question (IRA, Aug 2021)
A generally recommended practice for autopilot usage during cruise flight in icing conditions is
A
keeping the autopilot engaged while monitoring the system.
B
periodically disengaging the autopilot and hand flying the aircraft.✓ Correct Answer
C
periodically disengaging and immediately reengaging the altitude hold function.
Explanation
AC 91-74B recommends that, when using an autopilot in icing, pilots periodically disengage it and fly by hand, workload permitting, to feel handling changes caused by ice. An engaged autopilot can trim against the growing ice until it disconnects at a bad moment, and briefly cycling only the altitude hold does not let the pilot feel the aircraft.
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