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Captain reports an uncommanded right rudder hard over of approximately 15 degrees and roll had occurred on their md-80 while climbing thru FL275. Descended to FL240; slowed to 280 knots. Followed QRH and turned yaw damper to 'override'. Descended to FL240. Everything normal. Returned yaw damper to 'normal' position. Landing normal. Maintenance found fault in the restricted rudder portion of the rudder PCU and rudder limiter switch.
| Attributes | |
| ACN | 1268185 |
| Time | |
| Date | 201506 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Rudder Control System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Other / Unknown |
Narrative:
Climbing thru FL275 we had an un-commanded rudder input. I asked the first officer (first officer) to descend to FL240 and slow to 280 knots. We had no other abnormal indications. The first officer was hand flying the aircraft. I used the QRH and turned the yaw damper to 'override'. Everything was normal; so I returned the yaw damper to the 'normal' position. We [advised ATC of aircraft condition] and proceeded to ZZZ1 with no other issues. Landing was normal. The flight attendants were given the test briefing and instructed to call me if they felt or heard anything abnormal. Maintenance did find a fault in the restricted rudder portion of the rudder package.
Original NASA ASRS Text
Title: Captain reports an uncommanded Right Rudder hard over of approximately 15 degrees and roll had occurred on their MD-80 while climbing thru FL275. Descended to FL240; slowed to 280 knots. Followed QRH and turned Yaw Damper to 'Override'. Descended to FL240. Everything normal. Returned Yaw Damper to 'Normal' position. Landing normal. Maintenance found fault in the restricted rudder portion of the Rudder PCU and Rudder Limiter switch.
Narrative: Climbing thru FL275 we had an un-commanded rudder input. I asked the First Officer (FO) to descend to FL240 and slow to 280 knots. We had no other abnormal indications. The FO was hand flying the aircraft. I used the QRH and turned the Yaw Damper to 'Override'. Everything was normal; so I returned the Yaw Damper to the 'Normal' position. We [advised ATC of aircraft condition] and proceeded to ZZZ1 with no other issues. Landing was normal. The flight attendants were given the test briefing and instructed to call me if they felt or heard anything abnormal. Maintenance did find a fault in the Restricted Rudder portion of the rudder package.
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.