NTSB Identification: LAX83LA117.
The docket is stored on NTSB microfiche number 20325.
Accident occurred Thursday, February 24, 1983 in PEACH SPRINGS, AZ
Aircraft: BELL BH 206-L111, registration: N3898Y
Injuries: 5 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.

AFTER THE ROTORCRAFT TOOK OFF TO A HOVER THE PILOT DID A PEDAL TURN FOR A DOWN CANYON DEPARTURE. AFTER THE HOVER TURN THE PILOT SLID TO THE RIGHT TO CLEAR SOME OBSTACLES AND WHEN THE ROTORCRAFT MOVED LATERALLY ABOUT 25 FEET THE PILOT HEARD A BANG. THE LEFT PEDAL WAS SLACKED AND THE ROTORCRAFT BEGAN TO SPIN TO THE RIGHT UNTIL IT CAME TO REST 10 DEGREES NOSE DOWN. THERE WERE NO INJURIES AND NO FIRE. INVESTIGATION REVEALED THAT THE TAIL ROTOR SHAFT ASSEMBLY FAILED BETWEEN NUMBER 3 AND 4 HANGER BEARINGS. THE NUTS THAT HOLD EACH ASSEMBLY TOGETHER WERE MISSING. THE BOLTS WERE NOT SHEARED. ONE WAS FOUND IN THE ROCKS BELOW THE TAIL ROTOR. THE OTHER WAS STILL IN PLACE. NO NUTS WERE FOUND AT THE CRASH SCENE. THE FACTORY RECOMMENDED BLUE DOTS WERE MISSING WHEN THE NEW NUTS WERE REPLACED BY MAINTENANCE PERSONNEL.

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

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

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT BEARING..UNDERTORQUED

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