NTSB Identification: ATL83FA122.
The docket is stored on NTSB microfiche number 21115.
Accident occurred Saturday, February 26, 1983 in HARDEEVILLE, SC
Aircraft: BELL 47G-2, registration: N5191B
Injuries: 2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLT STATED THAT HE NOTICED A PECULIAR PEDAL REACTION DURING A TURN-AROUND; HOWEVER, HE REPORTED THAT THIS MAY HAVE BEEN CAUSED BY THE WIND WHICH WAS GUSTING TO 15 KTS. SHORTLY AFTER COMPLETING THE TURN-AROUND, HE EXPERIENCED A COMPLETE LOSS OF TAIL ROTOR CONTROL. THE FAILURE WAS REALIZED BY A REDUCTION OF NOISE, AN RPM INCREASE & AYAW TO THE RIGHT. THIS OCCURRED AT AN ALTITUDE OF APRX 300 FT AGL. THE PLT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL IN FLT, SO HE AUTOROTATED TO A NARROW LOGGING ROAD. WHILE DESCENDING TO LAND, THE MAIN ROTOR STRUCK TREES ON BOTH SIDES OF THE ROAD. DURING TOUCHDOWN. THE MAIN ROTOR STRUCK & SVERED THE TAIL BOOM. AN EXAM REVEALED THE TEETH ON THE FORWARD (SHORT) TAIL ROTOR DRIVE SHAFT, PN 47-644-180-9, WERE WORN & OVERHEATED. ALSO, THE MATCHING SPLINES ON THE FRONT COUPLING, PN 47-620-494-3, WERE OVERHEATED & STRIPPED. ONLY A MINIMAL AMOUNT OF LUBRICATION WAS FOUND IN THE FRONT COUPLING. THE BELL MAINTENANCE & OVERHAUL INSTRUCTIONS RECOMMENDED DAILY INSPECTIONS & LUBE EVERY 50 HRS.

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

MAINTENANCE,LUBRICATION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

MAINTENANCE,INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..OVERTEMPERATURE

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..WORN

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..FAILURE,TOTAL


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

DIRECTIONAL CONTROL..REDUCED

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