NTSB Identification: SEA89LA120.
The docket is stored on NTSB microfiche number 41187.
Accident occurred Saturday, June 24, 1989 in CENTRALIA, WA
Probable Cause Approval Date: 09/30/1991
Aircraft: BELL 47G-2, registration: N1161N
Injuries: 1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT WAS MAKING A TURN AROUND MANEUVER OVER TREES BETWEEN SWATH RUNS, WHEN HE HEARD A LOUD 'POP' & LOST TAIL ROTOR CONTROL. THE HELICOPTER BEGAN ROTATING & THE PLT INITIATED AN AUTOROTATION. HOWEVER, THE HELICOPTER IMPACTED WHILE IT WAS ROTATING, THEN IT ROLLED OVER. AN EXAM OF THE TAIL ROTOR DRIVE SYS REVEALED DAMAGE TO THE TAIL ROTOR BLADES, AS WELLAS TORSIONAL FAILURE OF THE TAIL ROTOR DRIVE SHAFT, BUT NO PREIMPACT PART FAILURE WAS FOUND.

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

THE PILOT MISJUDGED HIS CLEARANCE OVER TREES, WHICH RESULTED IN AN IN-FLIGHT TAIL ROTOR STRIKE WITH THE TREES AND LOSS OF TAIL ROTOR CONTROL. THE TREES WERE A RELATED FACTOR.

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