NTSB Identification: LAX86FVA10.
The docket is stored on NTSB microfiche number 34218.
Accident occurred Monday, June 30, 1986 in LE GRAND, CA
Probable Cause Approval Date: 02/03/1988
Aircraft: BELL UH-1B, registration: N64789
Injuries: 1 Serious.

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 EXPERIENCED AN ENGINE FAILURE SHORTLY AFTER LIFT-OFF PRIOR TO A SPRAY RUN ON A NEARBY FIELD. THE ENGINE DECELERATED TO ZERO AND THE ACFT COLLIDED WITH THE GROUND. EXAMINATION OF THE ENGINE REVEALED THE TURBINE ROTOR WAS DESTROYED AND EVIDENCE OF OVERSPEED AND TENSION OVERLOAD WAS FOUND.

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

TURBINE ASSEMBLY..OVERSPEED

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

TURBINE ASSEMBLY..FAILURE,TOTAL

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