NTSB Identification: SEA84LA034.
The docket is stored on NTSB microfiche number 24346.
Accident occurred Thursday, January 05, 1984 in MAPLETON, OR
Aircraft: HILLER UH-12E, registration: N4027K
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.

WHILE APPROACHING THE SPRAY AREA, THE ACFT WAS IN A LEVEL ATTITUDE AT 20 TO 25 MPH & ABOUT 100 FT AGL WHEN THE PLT HEARD A LOUD BANG & NOTED A LOSS OF POWER. HE ATTEMPTED AN AUTOROTATIVE LANDING. DURING TOUCHDOWN ON HILLY TERRAIN, THE ACFT ROLLED TO THE RIGHT & CAME TO REST INVERTED ON A STEEP SLOPE. A TEARDOWN OF THE ENG REVEALED THAT A SPUR ADAPTER GEARSHAFT, PN 6890482, & A COMPRESSOR COUPLING ADAPTER, PN 6871472, HAD FAILED. FAILURE OF THE SPUR ADAPTER GEARSHAFT WAS DUE TO FATIGUE WHICH ORIGINATED AT AN AREA OF HEAVY WEAR ON THE LOAD SIDE OF THE FORWARD SPLINES.

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

TURBOSHAFT ENGINE,GAS GENERATOR TURBINE SHAFT..WORN

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

TURBOSHAFT ENGINE,GAS GENERATOR TURBINE SHAFT..FATIGUE



Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY

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