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A pc-12 flight crew received a runaway autopilot stabilizer trim warning; followed the QRH procedure and completed the flight successfully.
| Attributes | |
| ACN | 1007782 |
| Time | |
| Date | 201204 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | CMH.Airport |
| State Reference | OH |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PC-12 |
| Flight Phase | Descent |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On descent into cmh; autopilot trim warning illuminated on CAWS panel followed by the audible tone indication for a runaway autopilot trim. The pilot flying felt pressure on the control yoke indicating control pressure not being free from the control servo manipulated by the autopilot. He then disconnected the autopilot using cws and the pitch trim trigger on the control yoke. The audible tone sounded when the autopilot disconnected. The autopilot annunciator light extinguished on the autopilot mode panel and the autopilot CAWS (caution) did not illuminate. The pilot flying did not feel the control pressure pitching the aircraft down relieve with the autopilot turned off. The pilot flying ordered and I executed the trim interrupt procedure in the QRH. Upon completion of the QRH procedure for pitch trim runaway; pitch trim was adjusted using primary stab trim. No additional system faults were experienced.
Original NASA ASRS Text
Title: A PC-12 flight crew received a runaway autopilot stabilizer trim warning; followed the QRH procedure and completed the flight successfully.
Narrative: On descent into CMH; autopilot trim warning illuminated on CAWS panel followed by the audible tone indication for a runaway autopilot trim. The pilot flying felt pressure on the control yoke indicating control pressure not being free from the control servo manipulated by the autopilot. He then disconnected the autopilot using CWS and the pitch trim trigger on the control yoke. The audible tone sounded when the autopilot disconnected. The autopilot annunciator light extinguished on the autopilot mode panel and the autopilot CAWS (caution) did not illuminate. The pilot flying did not feel the control pressure pitching the aircraft down relieve with the autopilot turned off. The pilot flying ordered and I executed the trim interrupt procedure in the QRH. Upon completion of the QRH procedure for pitch trim runaway; pitch trim was adjusted using primary stab trim. No additional system faults were experienced.
Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.