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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A captain and first officer report their yaw damper had disengaged even though the autopilot was still on. Autopilot was disengaged to check the freedom of the flight controls and crew found the ailerons; elevators and rudder to be frozen in place. Electric/hydraulic steering was inoperative after landing.
| Attributes | |
| ACN | 923230 |
| Time | |
| Date | 201012 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | P180 Avanti |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Rudder Control System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 6000 Flight Crew Type 3000 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 5500 Flight Crew Type 250 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Ground Event / Encounter Other / Unknown Inflight Event / Encounter Other / Unknown |
Narrative:
Lost yaw damper on descent [at] 15;000 ft. [We] turned off auto pilot to check [flight controls]. Rudder and yoke frozen in all directions; took both pilots to free up controls to move them. They were not totally free. On the ground they become unmovable [with] steering inoperative.
Original NASA ASRS Text
Title: A Captain and First Officer report their yaw damper had disengaged even though the autopilot was still on. Autopilot was disengaged to check the freedom of the flight controls and crew found the ailerons; elevators and rudder to be frozen in place. Electric/Hydraulic Steering was inoperative after landing.
Narrative: Lost yaw damper on descent [at] 15;000 FT. [We] turned off auto pilot to check [flight controls]. Rudder and yoke frozen in all directions; took both pilots to free up controls to move them. They were not totally free. On the ground they become unmovable [with] steering inoperative.
Data retrieved from NASA's ASRS site as of April 2012 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.