NTSB Identification: FTW83FA232.
The docket is stored on NTSB microfiche number 22623.
Accident occurred Sunday, May 15, 1983 in ZACHARY, LA
Aircraft: BELL 47G, registration: N739B
Injuries: 1 Serious,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 TAIL ROTOR GEAR BOX SEPARATED FROM THE ACFT DURING PRACTICE AUTOROTATION. THE ACFT BEGAN TO SPIN RAPIDLY AND NOSE DOWN. INCREASING THE POWER BROUGHT THE NOSE UP BUT INCREASED THE SPEED OF ROTATION. THE ACFT HIT ON ONE SKID STILL IN A RAPID SPIN. THE OCCUPANTS WERE ABLE TO EXIT THE WRECKAGE AND CRAWL AWAY. THE TAILROTOR GEAR BOX WAS FOUND 100 YDS AWAY. AN EXAM REVEALED THAT THE GEARBOX STUDS HAD FAILED FROM FATIGUE.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR GEARBOX(90 DEG)..FATIGUE

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

ROTOR DRIVE SYSTEM,TAIL ROTOR GEARBOX(90 DEG)..SEPARATION

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