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NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

August 7, 1990 · Aerospatiale SA315B · N351RM

Cougar, WA

Overview

Report Status

Probable Cause

Event Type

Accident

Date

August 7, 1990

Injury Outcomes

1 injury (1 serious injury)

Location

Cougar, WA

Aircraft

Aerospatiale SA315B

Tail Number

N351RM

Operator

Rocky Mountain Helicopters

Injuries

Serious

Aircraft Damage

Destroyed

NTSB Number

SEA90FA158

THE ACFT WAS HOVERING OVER TREES AT APPROX 200 FT. AGL, PICKING UP A LOAD OF LOGS DURING A LONG LINE HELI-LOGGING OPERATION, WHEN THE ENGINE LOST POWER. THE ACFT DESECENDED VERTICALLY AND IMPACTED THE TERRAIN. DISASSEMBLY AND EXAMINATION OF THE ENGINE SPEED GOVERNOR REVEALED PARTICLES OF SEALANT MATERIAL INSIDE THE GOVERNOR ASSY.

NTSB Probable Cause

LOSS OF POWER DUE TO CONTAMINATION IN THE ENGINE SPEED GOVERNOR.

Full Narrative

THE ACFT WAS HOVERING OVER TREES AT APPROX 200 FT. AGL, PICKING UP A LOAD OF LOGS DURING A LONG LINE HELI-LOGGING OPERATION, WHEN THE ENGINE LOST POWER. THE ACFT DESECENDED VERTICALLY AND IMPACTED THE TERRAIN. DISASSEMBLY AND EXAMINATION OF THE ENGINE SPEED GOVERNOR REVEALED PARTICLES OF SEALANT MATERIAL INSIDE THE GOVERNOR ASSY.

Flight

Event TypeAccident

Event Time11:30 PDT

Nearest Airport0nm N

Runway0

Runway Length0

Runway Width0

Flight Plan FiledNone

Aircraft FireNo

Aircraft ExplosionNo

Aircraft

AircraftAerospatiale SA315B

Tail NumberN351RM

Aircraft CategoryHeli

DamageDestroyed

OperatorRocky Mountain Helicopters

Operating RulePart 133

Engines1

Engine TypeTurboshaft

Engine DetailsTurbomeca · ARTOUSTE IIIB · Turboshaft · 853

Seats5

People & Injuries

Injury Summary1 injury (1 serious injury)

Fatal0

Serious1

Minor0

Uninjured0

Total1

Crew 1Age 42 · Second Class

Conditions

ConditionsVMC

LightDaylight

Wind310° @ 5 kt

Visibility40 sm

CeilingNone

Temperature / Dew Point57

Altimeter30.00 inHg

Observation Time17:50

Weather SourceWFAC

500 – Data service is offline

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August 7, 1990 · Aerospatiale SA315B · N351RM

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