NTSB Identification: MIA87LA224.
The docket is stored on NTSB microfiche number 34834.
Accident occurred Friday, August 07, 1987 in ORLANDO, FL
Probable Cause Approval Date: 10/07/1988
Aircraft: BELL 47J-2A, registration: N8523F
Injuries: 3 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.

DURING THE APCH TO LAND THE TAIL ROTOR DRIVE ASSY FAILED RESULTING IN A MOMENTARY LOSS OF CONTROL. THE PLT THEN AUTOROTATED & LANDED ON THE COMPANY HELIPAD, DURING WHICH THE HELICOPTER SUSTAINED SUBSTANTIAL DAMAGE. EXAMINATION OF THE TAIL ROTOR DRIVE ASSY REVEALED THAT THE FWD SHORT SHAFT FAILED TORSIONALLY APRX 2 INCHES AFT OF THE TRANSMISSION DRIVE COUPLING DUE TO A LACK OF LUBRICATION IN IT. THE FAILURE OCCURRED AT APRX 40' AGL.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT COUPLING..BINDING(MECHANICAL)

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

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

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

MAINTENANCE,LUBRICATION..INADEQUATE..OTHER MAINTENANCE PERSONNEL



Contributing Factors

FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND


Contributing Factors

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND

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