NTSB Identification: MKC84LA128.
The docket is stored on NTSB microfiche number 26125.
Accident occurred Tuesday, April 24, 1984 in POCAHONTAS, AR
Aircraft: HILLER UH-12E, registration: N9740C
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ACCESSORY DRIVE ASSY..FATIGUE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ACCESSORIES,ENGINE STARTER..FATIGUE

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,OVERHAUL..IMPROPER..OTHER MAINTENANCE PERSONNEL


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