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BE58 pilot reports runaway trim during descent to 1;800 ft on the localizer; causing a descent to 1;500 ft before recovery. ATC detected the overshoot.
| Attributes | |
| ACN | 955472 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Baron 58/58TC |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Vectors Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Elevator Trim System |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Instrument Flight Crew Commercial Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 62 Flight Crew Total 870 Flight Crew Type 48 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
Autopilot trim runaway caused me to shoot through my assigned altitude of 1;800 MSL. I was on the localizer when the trim ran from altitude to approach [and] dropped the nose. I turned the autopilot off and started to climb back up from 1;500 MSL to 1;800 MSL when ATC advised me of the altitude deviation. I corrected it and finished the ILS 24 approach. At the time I was in VFR conditions and had a visual on the runway.
Original NASA ASRS Text
Title: BE58 pilot reports runaway trim during descent to 1;800 FT on the LOC; causing a descent to 1;500 FT before recovery. ATC detected the overshoot.
Narrative: Autopilot trim runaway caused me to shoot through my assigned altitude of 1;800 MSL. I was on the localizer when the trim ran from Altitude to Approach [and] dropped the nose. I turned the autopilot off and started to climb back up from 1;500 MSL to 1;800 MSL when ATC advised me of the altitude deviation. I corrected it and finished the ILS 24 approach. At the time I was in VFR conditions and had a visual on the runway.
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.