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Cessna latitude flight crew reported the aircraft started an uncommanded roll.
| Attributes | |
| ACN | 1510173 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Latitude (C680A) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Track / Heading All Types |
Narrative:
We were enroute to ZZZ [and] we had just started the RNAV arrival. The next fix had restrictions to cross at FL250 and 280 knots. The autopilot and autothrottles were engaged and we were on a VNAV descent. Aircraft was stable and we were monitoring.the speed started creeping towards red line so I deployed the speed brakes as minimal as possible (just enough to stop the increase in speed.) the aircraft started a slow gentle roll; almost as if it was normal course change. Then the roll rate increased. At about 30 degree of bank (about 4 to 5 seconds after start of event); I disconnected autopilot and started recovering aircraft attitude. It was extremely difficult to regain control. (I started to think of possible jammed aileron.) aircraft attitude was recovered at approximately 45 degrees of bank and 6-7 degrees nose down.because of the event; we had deviated to right of the course and came close to entering restricted airspace. We notified ATC of the deviation and they gave us a heading then cleared us direct to another fix in the arrival. I hand flew the aircraft for next several minutes until we could analyze the situation. There were no EICAS messages; no indications; [and] no explanation of the roll event. The rest of the flight was uneventful. We contacted maintenance and the discrepancy was documented.
Original NASA ASRS Text
Title: Cessna Latitude flight crew reported the aircraft started an uncommanded roll.
Narrative: We were enroute to ZZZ [and] we had just started the RNAV arrival. The next fix had restrictions to cross at FL250 and 280 Knots. The Autopilot and Autothrottles were engaged and we were on a VNAV descent. Aircraft was stable and we were monitoring.The speed started creeping towards red line so I deployed the speed brakes as minimal as possible (just enough to stop the increase in speed.) The aircraft started a slow gentle roll; almost as if it was normal course change. Then the roll rate increased. At about 30 degree of bank (about 4 to 5 seconds after start of event); I disconnected autopilot and started recovering aircraft attitude. It was extremely difficult to regain control. (I started to think of possible jammed aileron.) Aircraft attitude was recovered at approximately 45 degrees of bank and 6-7 degrees nose down.Because of the event; we had deviated to right of the course and came close to entering restricted airspace. We notified ATC of the deviation and they gave us a heading then cleared us direct to another fix in the arrival. I hand flew the aircraft for next several minutes until we could analyze the situation. There were no EICAS messages; no indications; [and] no explanation of the roll event. The rest of the flight was uneventful. We contacted maintenance and the discrepancy was documented.
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.