NTSB Identification: LAX86LA277.
The docket is stored on NTSB microfiche number 32892.
Accident occurred Wednesday, July 02, 1986 in GARBERVILLE, CA
Aircraft: HILLER UH-12C, registration: N26186
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.

THE STUDENT PLT HAD JUST TAKEN OFF ON A TRAINING X-COUNTRY FLT WHEN THE MAIN ROTOR TACHOMETER NEEDLE DECREASED BELOW THE ENGINE TACHOMETER NEEDLE. HE TURNED THE HELICOPTER TO RETURN TO THE ARPT BUT WAS UNABLE TO MAINTAIN ALTITUDE AND LANDED HARD IN ROUGH TERRAIN. AFTER THE ACCIDENT THE STUDENT PLT STATED THAT HE HAD OBSERVED OIL LEAKING IN THE VICINITY OF THE CENTRIFUGAL, DRY CLUTCH DURING THIS AND PREVIOUS PREFIGHT INSPECTIONS.

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

ROTOR DRIVE SYSTEM,CLUTCH ASSEMBLY..FAILURE,PARTIAL

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..ATTEMPTED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

ENGINE ASSEMBLY,CRANKCASE..LEAK


Contributing Factors

FLUID,OIL..LEAK


Contributing Factors

LACK OF FAMILIARITY WITH AIRCRAFT..PILOT IN COMMAND

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