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Ce-525 captain reported the elevator trim control froze at 39;000 feet then descending to warmer air to thaw it.
| Attributes | |
| ACN | 1572524 |
| Time | |
| Date | 201808 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZTL.ARTCC |
| State Reference | GA |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Elevator ControlSystem |
| Person 1 | |
| Function | Enroute Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 86 Flight Crew Total 3070 Flight Crew Type 626 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
Upon starting descent from 39;000 MSL the amber boxed auto pilot out of trim box appeared on both pfds. After reviewing the abnormal checklist; I disconnected the auto pilot and the aircraft made an uncommanded pitch up.next; I discovered the pitch trim wheel was frozen and unable to be moved up or down with manual or electric trim. Both with the electric trim breaker pulled or without. I was able to maintain positive control of the aircraft using heavy forward pressure on the control yoke except for the brief moment when the auto pilot disconnected and did not deviate from ATC instructions. Therefore; I felt no need to declare an emergency at the time of the event.upon reaching warmer air; around 11;000 MSL the pitch trim freed up. A normal descent and landing at our destination airport followed.
Original NASA ASRS Text
Title: CE-525 Captain reported the elevator trim control froze at 39;000 feet then descending to warmer air to thaw it.
Narrative: Upon starting descent from 39;000 MSL the amber boxed auto pilot out of trim box appeared on both PFDs. After reviewing the abnormal checklist; I disconnected the auto pilot and the aircraft made an uncommanded pitch up.Next; I discovered the pitch trim wheel was frozen and unable to be moved up or down with manual or electric trim. Both with the electric trim breaker pulled or without. I was able to maintain positive control of the aircraft using heavy forward pressure on the control yoke except for the brief moment when the auto pilot disconnected and did not deviate from ATC instructions. Therefore; I felt no need to declare an emergency at the time of the event.Upon reaching warmer air; around 11;000 MSL the pitch trim freed up. A normal descent and landing at our destination airport followed.
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.