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A be-58 pilot reported a elevator trim ran away at 7;000 feet in level flight with traffic at 8;000 feet.
| Attributes | |
| ACN | 1460916 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Baron 58/58TC |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Elevator Trim System |
| Person 1 | |
| Function | Pilot Flying Single Pilot |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 164 Flight Crew Total 21989 Flight Crew Type 912 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy |
Narrative:
While on a vector for climb out I was assigned to maintain 7;000 feet MSL and advised of crossing traffic at 8;000 feet. As I approached the assigned altitude I engaged the altitude hold function on the century iv autopilot. Immediately following that I received an advisory of adverse weather ahead from center. Following that conversation I noticed that the altitude was approximately 100 feet high; so I depressed the pitch sync (control wheel steer) to reset the airplane in a gentle descent. I was startled by the yoke violently coming to the rear and putting the airplane in a somewhat severe nose high attitude. I recognized the situation as a runaway trim and depressed the autopilot disengage and trim interrupt button. By the time I wrestled the airplane to straight and level flight and turned off the electric trim I was at 7;400 and receiving a call from center to confirm my altitude.most of the airplanes I fly the pitch trim wheel is on the side of the console and I routinely rest my leg against the wheel and note any unusual rotation. This airplane's pitch trim wheel is enclosed in such a way that you physically have to reach for it to feel it. I assume that the trim was rotating to pitch up while the airplane was leveling and overpowering the autopilot when I noticed the slow climb and disengaged it. I completed the remainder of the flight with the electric trim turned off and the airplane is in the facility now getting the necessary repairs.
Original NASA ASRS Text
Title: A BE-58 pilot reported a elevator trim ran away at 7;000 feet in level flight with traffic at 8;000 feet.
Narrative: While on a vector for climb out I was assigned to maintain 7;000 feet MSL and advised of crossing traffic at 8;000 feet. As I approached the assigned altitude I engaged the ALT HOLD function on the Century IV autopilot. Immediately following that I received an advisory of adverse weather ahead from Center. Following that conversation I noticed that the altitude was approximately 100 feet high; so I depressed the pitch sync (control wheel steer) to reset the airplane in a gentle descent. I was startled by the yoke violently coming to the rear and putting the airplane in a somewhat severe nose high attitude. I recognized the situation as a runaway trim and depressed the autopilot disengage and trim interrupt button. By the time I wrestled the airplane to straight and level flight and turned off the electric trim I was at 7;400 and receiving a call from Center to confirm my altitude.Most of the airplanes I fly the pitch trim wheel is on the side of the console and I routinely rest my leg against the wheel and note any unusual rotation. This airplane's pitch trim wheel is enclosed in such a way that you physically have to reach for it to feel it. I assume that the trim was rotating to pitch up while the airplane was leveling and overpowering the autopilot when I noticed the slow climb and disengaged it. I completed the remainder of the flight with the electric trim turned off and the airplane is in the facility now getting the necessary repairs.
Data retrieved from NASA's ASRS site 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.