CF-2022-03R1

Requires introduction of an expanded pitch trim preflight check and new trim malfunction procedures, as well as revision of the AP STAB TRIM FAIL caution and STAB TRIM FAULT advisory procedures. Prompted by multiple in-service events where, following a STAB TRIM FAULT advisory message and an autopilot disconnect, both pilot and copilot commands to the horizontal stabilizer for an airplane nose-up trim resulted instead in nose-down trim movement of the horizontal stabilizer.