Anderson Field Airport: Brewster, Washington

Airport is located.

The non-certificated pilot reported that during the landing the aircraft encountered a gust of wind from the right about 15 feet above the ground. The aircraft veered left and subsequently impacted terrain approximately 20 feet to the left of the runway, coming to rest on its left side.
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While in cruise flight at 5,000 feet the pilot heard a loud bang, followed by an instantaneous increase in RPM. Subsequent attempts to sustain engine power with throttle and propeller inputs were unsuccessful, which resulted in the pilot attempting a forced landing to a paved runway approximately 4 miles away. The airplane subsequently impacted the last row of trees of an orchard less than one-half mile from the end of the runway, which resulted in the airplane coming to rest on its belly oriented on an easterly heading. A post accident examination of the airplane's engine revealed that all three planetary gears were severely damaged, and all three gears appeared to have lost all gear teeth, with a portion of the gear teeth located in the oil sump. The reason for the damage to the planetary gears was not determined.
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The pilot reported that he was in a slow hover about 6 to 8 feet above the trees. While turning left, his foot slipped off the right anti-torque pedal. This resulted in his left foot applying left anti-torque pedal, and the helicopter began to spin to the left. The helicopter's skid landing gear contacted the trees, and the helicopter descended to the ground and rolled onto its right side. The transmission, mast and main rotor system were torn from the helicopter as a unit. The tail boom was severed, and the center frame sustained structural damage.