NTSB Identification: SEA85LA097.
The docket is stored on NTSB microfiche number 28294.
Accident occurred Friday, April 26, 1985 in MYRTLE POINT, OR
Aircraft: HILLER 12E, registration: N99GM
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 CFR 137 FLIGHT A TOTAL LOSS OF POWER OCCURRED WITH AN AUDIBLE SCREECH COMING FORM THE ENGINE AREA. AUTOROTATION WAS MADE AND THE ACFT WAS LANDED INTO A HEVILY TREED AREA WITH STEEP TERRAIN. DURING ENGINE TEAR DOWN A FRACTURED IMPELLER WAS FOUND. METALLURGICAL ANALYSIS REVEALED THAT THE FRACTURED IMPELLER WAS DUE TO PROGRESSION OF A PRE-EXISTING FATIGUE CRACK IN THE IMPELLER.

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

COMPRESSOR ASSEMBLY,IMPELLER..FATIGUE

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

COMPRESSOR ASSEMBLY,IMPELLER..FAILURE,TOTAL


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..UPHILL


Contributing Factors

TERRAIN CONDITION..HIGH TERRAIN


Contributing Factors

TERRAIN CONDITION..TREE(S)

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