NTSB Identification: LAX88LA080.
The docket is stored on NTSB microfiche number 35491.
Accident occurred Sunday, January 03, 1988 in FONTANA, CA
Probable Cause Approval Date: 04/24/1990
Aircraft: BELL 47D1, registration: N175K
Injuries: 1 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 A SOLO INSTRUCTIONAL FLIGHT, THE PLT REPORTED THAT HE HEARD A LOUD BANG. THE ACFT BEGAN AN UNCONTROLLED SPINNING DESCENT TO THE RIGHT AND COLLIDED WITH THE TERRAIN. A TAIL ROTOR BLADE WAS FOUND TO HAVE SEPARATED FROM THE TAIL ROTOR. A METALLURGICAL EXAMINATION OF THE TAIL ROTOR YOKE REVEALED THAT THE YOKE FAILED DUE TO HIGH CYCLE FATIGUE.

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

NONE SUBMITTED

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