POCAHONTAS, AR, USA
N9740C
HILLER UH-12E
THE ACFT CRASHED AFTER AN ENGINE FAILURE DURING A SWATH RUN AT AN ALT OF 20 FT AGL. EXAMINATION OF THE ENGINE REVEALED 3 DOWEL PINS AND 6 SCREWS WHICH HOLD THE STARTER DRIVE GEAR AND THE ACCESSORY DRIVE GEAR HAD SHEARED. METALLURGICAL EXAM REVEALED THAT DOWEL PINS AND SCREWS FAILED FROM FATIGUE. THE ENGINE HAD BEEN IN OPERATION FOR 6 HRS SINCE A MAJOR OVERHAUL.
Source: NTSB Aviation Accident Database
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