Primary finding
Probable cause
failure of the main rotor drive torsional coupling and inner gimbal ring, which resulted in jamming of the flight controls during an attempted autorotation.
NTSB investigation record
Hiller Uh-12E· N102HT
Primary finding
failure of the main rotor drive torsional coupling and inner gimbal ring, which resulted in jamming of the flight controls during an attempted autorotation.
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