N. MYRTLE BEACH, SC, USA
N234SM
HILLER 12C
The private helicopter pilot and certified flight instructor were conducting pre-checkride flight training. While executing an autorotation to a power recovery, the tail rotor assembly collided with the ground and subsequently separated from the gearbox assembly. No mechanical problems with the helicopter were reported by the pilots.
On December 18, 1995, at 1500 eastern standard time, a Hiller 12C, N234SM, touched down hard during a practice autorotation at the Grand Strand Airport in North Myrtle Beach, South Carolina. The instructional flight operated under the provisions of 14 CFR Part 91 with no flight plan filed. Visual weather conditions prevailed at the time of the accident. The helicopter sustained substantial damage; the certified flight instructor and the private pilot were not injured. The flight departed North Myrtle Beach, at 1430. The pilots were conducting pre-checkride flight training. According to the private pilot, they were executing a practice autorotation to a powered recovery. As the pilots maneuvered the helicopter during the flare, the tail rotor assembly struck the ground. No mechanical problems with the airplane were reported by the pilot.
The pilot's improper operation of the flight controls during a practice autorotation, and the certified flight instructor's inadequate supervision of the operation
Source: NTSB Aviation Accident Database
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