ARVIN, CA, USA
N9753C
HILLER UH12-E, SALOY CONVER
THE PILOT WAS CONDUCTING AN AERIAL APPLICATION FLIGHT. WHILE EXECUTING THE PROCEDURE TURNAROUND, THE MAIN ROTOR BLADE TENSION TORSION PIN FAILED DUE TO FATIGUE. THIS PART HAS A LIFE LIMIT OF 643 HOURS. THE FAILED PIN ACCRUED 641.5 HOURS. THE PILOT WAS ABLE TO EXECUTE AN AUTOROTATION, BUT WAS UNABLE TO FLARE WHICH RESULTED IN A HARD LANDING.
THE FAILURE OF THE TENSION TORSION BAR PIN DUE TO FATIGUE. CONTRIBUTING TO THIS ACCIDENT WAS THAT IT WAS NOT POSSIBLE FOR THE PILOT TO FLARE THE HELICOPTER ON LANDING.
Source: NTSB Aviation Accident Database
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