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CL65 flight crew experiences autopilot failure at 11;000 feet during arrival in moderate turbulence; causing 200 feet of altitude loss. Aircraft is then hand flown to a normal landing.
| Attributes | |
| ACN | 880587 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence |
Narrative:
The first officer was the flying pilot. On downwind we were on radar vectors due to weather and level at 11;000ft. The flight conditions were moderate turbulence and IMC. The aircraft's autopilot disengaged on its own and [we had an] uncommanded downward pitch with an excessive downward force. This along with a stabilizer trim and mach trim being disengaged with no pilot input; caused the stabilizer trim and mach trim amber caution messages; along with the ap pitch nd message; [to appear]. The aircraft lost approx 200ft of altitude and the aircraft was now being hand flown by the first officer. He regained altitude almost immediately and leveled off back at 11;000ft. Approach control shortly thereafter gave us a descent to 7;000ft. The first officer then hand flew the rest of the approach and landing and the stabilizer & mach trim were able to be reset. We attempted to reset the autopilot but were unsuccessful. A normal landing was performed and a discrepancy was logged and reported to our maintenance.
Original NASA ASRS Text
Title: CL65 flight crew experiences autopilot failure at 11;000 feet during arrival in moderate turbulence; causing 200 feet of altitude loss. Aircraft is then hand flown to a normal landing.
Narrative: The First Officer was the Flying Pilot. On downwind we were on radar vectors due to weather and level at 11;000ft. The flight conditions were moderate turbulence and IMC. The aircraft's autopilot disengaged on its own and [we had an] uncommanded downward pitch with an excessive downward force. This along with a STAB TRIM and MACH TRIM being disengaged with no pilot input; caused the STAB TRIM and MACH trim amber caution messages; along with the AP PITCH ND message; [to appear]. The aircraft lost approx 200ft of altitude and the aircraft was now being hand flown by the First Officer. He regained altitude almost immediately and leveled off back at 11;000ft. Approach Control shortly thereafter gave us a descent to 7;000ft. The First Officer then hand flew the rest of the approach and landing and the STAB & MACH TRIM were able to be reset. We attempted to reset the autopilot but were unsuccessful. A normal landing was performed and a discrepancy was logged and reported to our Maintenance.
Data retrieved from NASA's ASRS site as of April 2012 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.