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A321 captain reported uncommanded rotation prior to V1 that could not be overcome by the side stick.
| Attributes | |
| ACN | 1586140 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SFO.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Local Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Weight And Balance Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft tow (take-off weight) approximately 140K lbs; cg 17.7; T.O. Trim setting 2.7NU. During takeoff roll; approximately ten knots prior to rotate speed; nose gear began lifting off of runway. Nose down force applied to side stick controller failed to control pitch. At five knots prior to rotate speed nose gear became fully airborne and the aircraft continued an uncommanded rotation until fully airborne. For several seconds the side stick controller was unable to overcome the continued increase in pitch. As the automated pitch trim system continued to trim; normal flight characteristics were restored after approximately 20-30 seconds. Aircraft accelerated near the flap speed limit until control of the aircraft was restored.both dispatch and maintenance were fully debriefed about this incident. I am waiting for the results of their investigations. Improper aircraft loading and/or errors in the [performance calculations] are suspected.feedback from dispatch and maintenance are required to determine the cause of the incident prior to making any recommendations.
Original NASA ASRS Text
Title: A321 Captain reported uncommanded rotation prior to V1 that could not be overcome by the side stick.
Narrative: Aircraft TOW (Take-Off Weight) approximately 140K lbs; CG 17.7; T.O. trim setting 2.7NU. During takeoff roll; approximately ten knots prior to rotate speed; nose gear began lifting off of runway. Nose down force applied to side stick controller failed to control pitch. At five knots prior to rotate speed nose gear became fully airborne and the aircraft continued an uncommanded rotation until fully airborne. For several seconds the side stick controller was unable to overcome the continued increase in pitch. As the automated pitch trim system continued to trim; normal flight characteristics were restored after approximately 20-30 seconds. Aircraft accelerated near the flap speed limit until control of the aircraft was restored.Both dispatch and maintenance were fully debriefed about this incident. I am waiting for the results of their investigations. Improper aircraft loading and/or errors in the [performance calculations] are suspected.Feedback from dispatch and maintenance are required to determine the cause of the incident prior to making any recommendations.
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.