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Cessna citation excel flight crew reported a flight control anomaly involving both the pitch and roll trim systems. Aircraft control was regained; but an altitude deviation of several hundred feet occurred.
| Attributes | |
| ACN | 1513429 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Aileron Trim System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude |
Narrative:
While at cruise at FL250; we received a roll trim annunciation. We accomplished the memory action item by disconnecting the autopilot. [The pilot flying] was anticipating a roll movement; but the airplane also pitched down hard and started descending. I told the copilot to pull back; to which he replied 'I am!' and indicated that there was a lot of force pitching the plane forward. We were able to arrest the descent [but] lost between 400-500 feet before returning to altitude. Afterward; [the pilot flying] commented that he felt like he was fighting against the autopilot when he was hand flying; but I verified that the autopilot had been disconnected.
Original NASA ASRS Text
Title: Cessna Citation Excel flight crew reported a flight control anomaly involving both the pitch and roll trim systems. Aircraft control was regained; but an altitude deviation of several hundred feet occurred.
Narrative: While at cruise at FL250; we received a ROLL TRIM annunciation. We accomplished the memory action item by disconnecting the autopilot. [The pilot flying] was anticipating a roll movement; but the airplane also pitched down hard and started descending. I told the copilot to pull back; to which he replied 'I am!' And indicated that there was a lot of force pitching the plane forward. We were able to arrest the descent [but] lost between 400-500 feet before returning to altitude. Afterward; [the pilot flying] commented that he felt like he was fighting against the autopilot when he was hand flying; but I verified that the autopilot had been disconnected.
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.