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Pc-12 captain reported a yaw damp fail message in cruise flight and that the crew were unable to successfully reset the yaw damper.
| Attributes | |
| ACN | 1543049 |
| Time | |
| Date | 201805 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight Yaw Damper |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
In cruise at FL190; we were navigating around buildups. [During a] turn to the left we noticed the blue cas message display yaw damp failure illuminate and go away. The light on the yd button on the fcp was indicating off with no light illuminated. I tried to trim the aircraft by disengaging the autopilot and could not get the rudder trim to trim left. I took manual control of the aircraft and assigned the QRH to the first officer. We went through the procedures fully and I assigned control of the aircraft to him so I could properly identify and pull the appropriate circuit breaker's lh Y2 and Z2 as described in the QRH. The reset was unsuccessful. We manually held the aircraft in trim (coordination) the remainder of the flight - 55 mins. I attempted to contact the company and received no response. I didn't want to ground the plane in an area we didn't have maintenance. After no response I chose to continue to the original intended destination and notify maintenance at that time. We brought the plane down with both crew members assisting in rudder control by using the pedals until 500 feet AGL in which I briefed I would assume full command of the rudder only. [The first officer] was briefed and was aware and we were able to land safely with the trim out. I notified maintenance and tried to perform the suggested items with no success. The plane is currently grounded.
Original NASA ASRS Text
Title: PC-12 Captain reported a Yaw Damp Fail message in cruise flight and that the crew were unable to successfully reset the yaw damper.
Narrative: In cruise at FL190; we were navigating around buildups. [During a] turn to the left we noticed the Blue CAS message display YAW DAMP FAILURE illuminate and go away. The light on the YD button on the FCP was indicating off with no light illuminated. I tried to trim the aircraft by disengaging the autopilot and could not get the rudder trim to trim left. I took manual control of the aircraft and assigned the QRH to the First Officer. We went through the procedures fully and I assigned control of the aircraft to him so I could properly identify and pull the appropriate CB's LH Y2 and Z2 as described in the QRH. The reset was unsuccessful. We manually held the aircraft in trim (coordination) the remainder of the flight - 55 mins. I attempted to contact the company and received no response. I didn't want to ground the plane in an area we didn't have Maintenance. After no response I chose to continue to the original intended destination and notify Maintenance at that time. We brought the plane down with both crew members assisting in rudder control by using the pedals until 500 feet AGL in which I briefed I would assume full command of the rudder only. [The FO] was briefed and was aware and we were able to land safely with the trim out. I notified Maintenance and tried to perform the suggested items with no success. The plane is currently grounded.
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.