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C421 captain reported a frozen elevator trim resulted in the aircraft overshooting an altitude restriction by 300 feet. The flight crew disconnected the autopilot and ATC provided assistance clearing the crew to descend where the trim became operative.
| Attributes | |
| ACN | 1603193 |
| Time | |
| Date | 201812 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Golden Eagle 421 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Elevator Trim System |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 3500 Flight Crew Type 800 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence |
Narrative:
Trim wheel froze in an upward condition at 16;000 feet. Aircraft climbed to 16;300 feet. Center advised of altitude change; and was advised of troubleshooting in progress.strong forward pressure was applied to control wheel. Autopilot and trim switches were turned off. Associated circuit breakers were pulled. Power was reduced. Request was granted for descent to 6;000 feet. Approaching descent altitude; trim wheel became operative. Approach and landing were made normally.
Original NASA ASRS Text
Title: C421 Captain reported a frozen elevator trim resulted in the aircraft overshooting an altitude restriction by 300 feet. The flight crew disconnected the autopilot and ATC provided assistance clearing the crew to descend where the trim became operative.
Narrative: Trim wheel froze in an upward condition at 16;000 feet. Aircraft climbed to 16;300 feet. Center advised of altitude change; and was advised of troubleshooting in progress.Strong forward pressure was applied to control wheel. Autopilot and trim switches were turned off. Associated circuit breakers were pulled. Power was reduced. Request was granted for descent to 6;000 feet. Approaching descent altitude; trim wheel became operative. Approach and landing were made normally.
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.