NTSB Identification: DEN86LA016.
The docket is stored on NTSB microfiche number 29810.
Nonscheduled 14 CFR
Accident occurred Friday, November 01, 1985 in VERNAL, UT
Aircraft: HILLER UH-12E, registration: N400AH
Injuries: 2 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 PLT STATED HE HAD JUST DEPARTED A SITE LOCATED ON TOP OF A MOUNTAIN, WHICH IS APPROXIMATELY 12,200 FT MSL. THE PILOT SAID 30 SECONDS LATER, THE HELICOPTER LOST PARTIAL POWER. REQUIRING HIM TO MAKE A FORCE LANDING. THE INSPECTION OF THE TURBOCHARGER REVEALED THE COMPRESSOR IMPELLER RETAINING NUT HAD BACKED OFF, ALLOWING THE COMPRESSOR IMPELLER TO CONTACT THE COMPRESSOR SHROUD AND LEADING TO THE SEIZURE OF THE IMPELLER. THIS RESULTED IN THE FAILURE OF THE TURBOCHARGER.

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

EXHAUST SYSTEM,TURBOCHARGER..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY




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