NTSB Identification: FTW85LA295.
The docket is stored on NTSB microfiche number 29033.
Nonscheduled 14 CFR
Accident occurred Sunday, July 21, 1985 in SOUTH MARSH
Aircraft: BELL 206L-1, registration: N5753D
Injuries: 2 Minor.

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 PLT WAS INITIATING A TAKEOFF FROM A HOVER OFF AN OFFSHORE OIL RIG. AS HE LOWERED THE NOSE FOR TAKEOFF, HE HEARD A LOUD NOISE EMIT FROM THE TAILBOOM AREA & THE ACFT BEGAN ROTATING TO THE RIGHT. THE PLT CONTINUED TO APPLY PWR AND AUTOROTATED TO THE WATER. ON IMPACT, THE MAIN ROTOR STRUCK THE TAILBOOM AND SEVERED IT. THE AFT SECTION OF THE TAILBOOM AND THE TAIL ROTOR GEARBOX WERE NOT RECOVERED. INDICATIONS ARE THAT THE ACFT EXPERIENCED A MALFUNCTION IN THE TAIL ROTOR DRIVE SYSTEM.

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

ROTORCRAFT FLIGHT CONTROL,TAIL ROTOR CONTROL..UNDETERMINED

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