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NTSB Report

April 26, 1985 · Hiller 12E · N99GM

Myrtle Point, OR

Overview

Report Status

Preliminary report

Event Type

Accident

Date

April 26, 1985

Injury Outcomes

No injuries (1 uninjured)

Location

Myrtle Point, OR

Aircraft

Hiller 12E

Tail Number

N99GM

Injuries

None

Aircraft Damage

Substantial

NTSB Number

SEA85LA097

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.

Full Narrative

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.

Flight

Event TypeAccident

Event Time09:00 PST

Nearest Airport0nm

Runway0

Flight Plan FiledNone

Aircraft FireNo

Aircraft ExplosionNo

Aircraft

AircraftHiller 12E

Tail NumberN99GM

Aircraft CategoryHeli

DamageSubstantial

Operating RulePart 137

Engines1

Engine TypeTurboshaft

Engine DetailsAllison · 250-C20B · Turboshaft · 305

Seats3

People & Injuries

Injury SummaryNo injuries (1 uninjured)

Fatal0

Serious0

Minor0

Uninjured1

Total1

Crew 1Age 45 · Second Class

Conditions

ConditionsVMC

LightDaylight

WindCalm

Visibility30 sm

CeilingNone

Temperature / Dew Point50 / 0 C

Altimeter0

Observation Time09:00

Weather SourcePILO

500 – Data service is offline

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April 26, 1985 · Hiller 12E · N99GM

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Full Narrative