皇冠体育app

Sikorsky S-76C, G-XXEB

Summary:

During approach and descent to Denham Aerodrome, with autopilot disengaged, the pilot became aware of the aircraft yawing right. 皇冠体育app pilot made a corrective pedal input and felt a restriction in the left pedal which also appeared to have an effect on the neutral yaw pedal position. 皇冠体育app pilot declared a PAN and conducted an uneventful running landing. 皇冠体育app yaw control system abnormality remained until the aircraft was shut down. 皇冠体育app fault was later traced to the Pedal Damper Trim Actuator (PDTA). A detailed examination of the PDTA found that a small metal sealing ball had split within the solenoid valve. This caused an internal leakage of hydraulic pressure resulting in a PDTA trim runaway input and restriction within the helicopter yaw control system.

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