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B737NG flight crew reported uncommanded roll with autopilot engaged during descent when spoilers/speedbrakes were extended and retracted.
| Attributes | |
| ACN | 1585089 |
| Time | |
| Date | 201810 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Spoiler System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 18475 Flight Crew Type 10635 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 65 Flight Crew Type 2241 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
During descent into ZZZ; extended speed brakes and experienced a strong uncommanded roll to the right. Retracted the speed brakes and aircraft rolled even stronger to the left; nosed down; and overspeed clacker sounded momentarily. [We notified ATC] since this was a flight control issue and uncertainty existed as to how the aircraft would respond after landing with auto spoiler activation. Aircraft continued descent and approach without further use of speed brakes and no further controllability issues occurred. Visual approach and landing were performed without incident. Spoilers were used for landing and controllability was not an issue during landing rollout. This is the fourth write-up of this issue in a few days. This is the second such write-up from this crew. The same event occurred to us on descent...yesterday. This was a reposition flight...following a spoiler panel removal and replacement.
Original NASA ASRS Text
Title: B737NG flight crew reported uncommanded roll with autopilot engaged during descent when spoilers/speedbrakes were extended and retracted.
Narrative: During descent into ZZZ; extended speed brakes and experienced a strong uncommanded roll to the right. Retracted the speed brakes and aircraft rolled even stronger to the left; nosed down; and overspeed clacker sounded momentarily. [We notified ATC] since this was a flight control issue and uncertainty existed as to how the aircraft would respond after landing with auto spoiler activation. Aircraft continued descent and approach without further use of speed brakes and no further controllability issues occurred. Visual approach and landing were performed without incident. Spoilers were used for landing and controllability was not an issue during landing rollout. This is the fourth write-up of this issue in a few days. This is the second such write-up from this crew. The same event occurred to us on descent...yesterday. This was a reposition flight...following a spoiler panel removal and replacement.
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.