Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 80; Flight Crew Total 1900; Flight Crew Type 820
Aircraft Equipment Problem Critical
Aircraft Equipment Problem Dissipated; Flight Crew FLC Overrode Automation; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
While practicing an ILS approach on A/P I went missed at the FAF and reengaged A/P at 1;800 ft; at that point Aircraft started pitching in an unusual high nose up attitude; tried to disengage A/P by pressing A/P on the yoke; additionally on the A/P disconnect on autopilot panel; and finally disconnected circuit breaker; none of this disengaged it and aircraft continued pitching up and down with elevator trim running up and down on its own.Was able to land after 90 second approximately from when event started; very difficult to control but landed safely.Reported the incident to NTSB and sent them the data card of the aircraft flight; awaiting for results back.
While practicing an ILS approach on A/P I went missed at the FAF and reengaged A/P at 1;800 ft; at that point Aircraft started pitching in an unusual high nose up attitude; tried to disengage A/P by pressing A/P on the yoke; additionally on the A/P disconnect on A/P panel; and finally pulled A/P circuit breaker ; non of this disengaged it and aircraft continued pitching up and down with elevator trim running up and down on its on.Was able to land after 9 seconds approximately from when event started; very difficult to control but landed safely.Reported the incident to NTSB and sent them the data card of the aircraft flight; awaiting for results back.After 30 minutes on the ground and shutting off avionics 1 and 2 and master switch decided to fly back to base with A/P breaker off. The 20 mins Flight was uneventful. Problem is definitely with pitch trim and or A/P.
Pilot reported a pitch trim failure on missed approach.