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B757 captain reported diverting to an alternate after experiencing flight control abnormalities.
| Attributes | |
| ACN | 1342066 |
| Time | |
| Date | 201603 |
| Aircraft 1 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Aeroplane Flight Control |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 17000 Flight Crew Type 612 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
During cruise at FL330 in smooth conditions we experienced several strong and numerous weaker un-commanded yaw inputs. The aircraft tail yawed to the left and then returned to a neutral position to the right. The right auto-pilot was on. During these events the amber 'brake temp' light illuminated and the brake values changed from zero to a different number such as 1; 2; or 3; and a loud hissing sound could be heard that ceased when the yaw ended. Due to the possibility of a flight control malfunction I [advised ATC] and diverted to the nearest suitable airport; and landed without incident.
Original NASA ASRS Text
Title: B757 Captain reported diverting to an alternate after experiencing flight control abnormalities.
Narrative: During cruise at FL330 in smooth conditions we experienced several strong and numerous weaker un-commanded yaw inputs. The aircraft tail yawed to the left and then returned to a neutral position to the right. The right auto-pilot was on. During these events the amber 'brake temp' light illuminated and the brake values changed from zero to a different number such as 1; 2; or 3; and a loud hissing sound could be heard that ceased when the yaw ended. Due to the possibility of a flight control malfunction I [advised ATC] and diverted to the nearest suitable airport; and landed without incident.
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.