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A ce-560XL ap trim mis comp and master caution alerted as the descent was begun from FL380 with a -33 OAT so the aircraft was slowed to descend and at about 8;000 ft with a +5 OAT the trim began normal operation so the crew suspected icing somewhere in the trim system.
| Attributes | |
| ACN | 1082751 |
| Time | |
| Date | 201304 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Elevator Trim System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
After cruising at FL380 with an oat of -33 C; we started a descent and observed an ap trim mis comp annunciator along with a master caution. Upon running the abnormal checklist we discovered the elevator trim to be frozen; would not move in either direction electrically or manually; so our speed was reduced to about 250 KTS to achieve a neutral trim setting in the descent. It wasn't until about 8;000 ft with an OAT of +5 C that the elevator trim became unstuck. The only thing we could not comply with was an increased assigned speed by ATC. We landed uneventfully.
Original NASA ASRS Text
Title: A CE-560XL AP TRIM MIS COMP and Master Caution alerted as the descent was begun from FL380 with a -33 OAT so the aircraft was slowed to descend and at about 8;000 FT with a +5 OAT the trim began normal operation so the crew suspected icing somewhere in the trim system.
Narrative: After cruising at FL380 with an oat of -33 C; we started a descent and observed an AP TRIM MIS COMP annunciator along with a Master Caution. Upon running the Abnormal Checklist we discovered the elevator trim to be frozen; would not move in either direction electrically or manually; so our speed was reduced to about 250 KTS to achieve a neutral trim setting in the descent. It wasn't until about 8;000 FT with an OAT of +5 C that the elevator trim became unstuck. The only thing we could not comply with was an increased assigned speed by ATC. We landed uneventfully.
Data retrieved from NASA's ASRS site as of July 2013 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.