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MD11 flight crew reports the autopilot turning the aircraft to the right when the heading bug is turned to the left. The autopilot is eventually turned off and the aircraft manually flown to the desired heading. The autopilot is then successfully reengaged. During the hand flown approach the aircraft handles strangely and after landing the number two hydraulic system fails.
| Attributes | |
| ACN | 1128725 |
| Time | |
| Date | 201311 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZZ.TRACON |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
I was directed to turn left from a heading of 020 to 330. I bugged 330 and the plane turned right. I disconnected the number 1 autopilot and started back to the left; re-engaged the number 1 autopilot and the plane again turned right. The zipper was left. I again disconnected the number 1 autopilot and turned left. ATC asked us about our heading and we told them that we were having flight control problems. I manually rolled out on the assigned heading and engaged number 2 autopilot. No further problems until landing when we had a complete hydraulic qty number 2 failure. I did a precautionary shutdown of number 2 engine while taxiing in order to prevent any possible damage to the number 2 engine and its associated systems. The failure was somewhere in the flight control systems of the right wing as evidenced by the hydraulic puddle under it. Hydraulic system number 2 failure and number 1 autopilot failure.
Original NASA ASRS Text
Title: MD11 flight crew reports the autopilot turning the aircraft to the right when the heading bug is turned to the left. The autopilot is eventually turned off and the aircraft manually flown to the desired heading. The autopilot is then successfully reengaged. During the hand flown approach the aircraft handles strangely and after landing the number two hydraulic system fails.
Narrative: I was directed to turn left from a heading of 020 to 330. I bugged 330 and the plane turned right. I disconnected the Number 1 autopilot and started back to the left; re-engaged the Number 1 autopilot and the plane again turned right. The zipper was left. I again disconnected the Number 1 autopilot and turned left. ATC asked us about our heading and we told them that we were having flight control problems. I manually rolled out on the assigned heading and engaged Number 2 autopilot. No further problems until landing when we had a complete HYD QTY Number 2 failure. I did a precautionary shutdown of Number 2 engine while taxiing in order to prevent any possible damage to the Number 2 engine and its associated systems. The failure was somewhere in the flight control systems of the right wing as evidenced by the hydraulic puddle under it. Hydraulic system Number 2 failure and Number 1 autopilot failure.
Data retrieved from NASA's ASRS site as of July 2013 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.