What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
1958 Hiller UH-12C helicopter engine quit, the pilot attempted to auto rotate the acft, the acft struck power lines, landed in a field, and severed the tail, drive shaft, and tail rotor, other circumstances are unknown. (-23) the pilot stated that he experienced a loss of power to the rotor. Executed an autorotation to an open field. On the autorotational approach t he helicopter struck a power line. The helicopter turned 180 degrees to the left and struck the ground tail first. The helicopter remained upright when it collided with the ground.
As the FAA filed it
1958 HILLER UH-12C HELICOPTER ENGINE QUIT, THE PILOT ATTEMPTED TO AUTO ROTATE THE ACFT, THE ACFT STRUCK POWER LINES, LANDED IN A FIELD, AND SEVERED THE TAIL, DRIVE SHAFT, AND TAIL ROTOR, OTHER CIRCUMSTANCES ARE UNKNOWN. (-23) THE PILOT STATED THAT HE EXPERIENCED A LOSS OF POWER TO THE ROTOR. EXECUTED AN AUTOROTATION TO AN OPEN FIELD. ON THE AUTOROTATIONAL APPROACH T HE HELICOPTER STRUCK A POWER LINE. THE HELICOPTER TURNED 180 DEGREES TO THE LEFT AND STRUCK THE GROUND TAIL FIRST. THE HELICOPTER REMAINED UPRIGHT WHEN IT COLLIDED WITH THE GROUND.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.