NTSB
24 Nov, 11On November 15, 2011, at 0837 mountain standard time, a restricted category Williams Helicopter Corporation, UH-1H, N502AW, experienced a loss of power, made a hard landing, and came to rest on its right side about 3 miles northwest of the Valle Airport (40G), Grand Canyon, Arizona. The pilot operated the helicopter under the provisions of 14 Code of Federal Regulations Part 91 as a business flight. The pilot, the sole occupant, was seriously injured; the helicopter sustained substantial damage. Visual meteorological conditions prevailed for the local area flight that was departing at the time of the accident. The flight was destined for Hualapai Hilltop, Supai, Arizona.
The pilot reported to the Federal Aviation Administration (FAA) accident coordinator that he was flying about 500 feet above ground level (agl), approximately 1/4 mile from power lines, when the Master Caution warning came on that was tripped by the "transmission low oil pressure." He made an immediate left turn away from power lines and set up an approach to land the helicopter. The pilot stated that at as the helicopter descended, at altitudes of 50 feet and 30 feet agl, the helicopter yawed approximately 30 degrees to the left and right. About 10 feet agl, and almost zero airspeed, the main rotor speed slowed and then stopped. The helicopter fell the remaining distance to ground impact. The pilot cut himself out of his seatbelt, crawled out of the helicopter, and called 911 from his cell phone.
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