NTSB Identification: FTW86FA033.
The docket is stored on NTSB microfiche number 32260.
Accident occurred Tuesday, January 07, 1986 in PORT O'CONNOR, TX
Aircraft: BELL 206B, registration: N520EH
Injuries: 1 Minor.

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 HELICOPTER SUSTAINED A LOSS OF TAILROTOR DRIVE ON LIFT OFF. A BONDING IN A SHAFT COUPLING FAILED. EXTENSIVE RESEARCH AND ANALYSIS DISCOVERED NO DISCREPANCIES IN DESIGN, PRODUCTION, QUALITY ASSURANCE, MAINTENANCE OR OPERATING ENVIRONMENT THAT COULD HAVE RESULTED IN THIS FAILURE. ONLY ONE PREVIOUS OCCURRENCE WAS DOCUMENTED, IN AN ASSEMBLY FROM ANOTHER VENDOR.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..SEPARATION

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

REASON FOR OCCURRENCE UNDETERMINED


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