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B737 flight crew reported uncommanded 25-30 degree roll while retracting speedbrake. Uncommanded roll previously reported.
| Attributes | |
| ACN | 1601731 |
| Time | |
| Date | 201812 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 992.63 Flight Crew Type 992.63 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
Started a descent from 36;000 [feet] following VNAV path with autopilot on. Aircraft was a touch high; so opened speed brakes at normal rate to detent. When retracted speed brakes at normal to slow rate; aircraft banked to 25-30 degrees to right in approximately 2 seconds. Attempted to stop bank by turning off ap; autothrottles; and rotating yoke in opposite direction. Took approximately 2 seconds to return to level flight. Continued flight without using speedbrakes. Had been a previous maintenance write up for this; but had been closed the day before. Other flights had occurred since closing of write up. Continued on to destination.
Original NASA ASRS Text
Title: B737 Flight crew reported uncommanded 25-30 degree roll while retracting speedbrake. Uncommanded roll previously reported.
Narrative: Started a descent from 36;000 [feet] following VNAV path with autopilot on. Aircraft was a touch high; so opened speed brakes at normal rate to detent. When retracted speed brakes at normal to slow rate; aircraft banked to 25-30 degrees to right in approximately 2 seconds. Attempted to stop bank by turning off AP; autothrottles; and rotating yoke in opposite direction. Took approximately 2 seconds to return to level flight. Continued flight without using speedbrakes. Had been a previous Maintenance write up for this; but had been closed the day before. Other flights had occurred since closing of write up. Continued on to destination.
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.