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Aviation safety reports, made easier to study

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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July 2, 1982 · Hughes 369B · N1108T

Jenner, CA

Overview

Report Status
Preliminary report
Event Type
Accident
Date
July 2, 1982
Injury Outcomes
No injuries (2 uninjured)
Location
Jenner, CA
Aircraft
Hughes 369B
Tail Number
N1108T
Operator
Sondma County Sheriff
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX82FA247

HELICOPTER WAS ON ROUTINE POLICE PATROL WHEN ENGINE FAILED AND IT AUTOROTATED TO A ROUGH LANDING ON A ROCKY BEACH. THE 1ST STAGE OF THE GAS PRODUCER SECTION OF THE TURBINE WAS FOUND FROZEN. THE TURBINE WHEEL BLADES WERE RUBBING & SEIZED TO THE 1ST STAGE TURBINE SHROUD OF THE 2ND STAGE NOZZLE ASS'Y. PIECES OF THE TURBINE BLADE'S TRAILING EDGE TIPS WERE MISSING & THERE WAS A METAL BUILDUP ON THE 2ND STAGE NOZZLE BLADE TRACK AREA. DURING DISASSEMBLY THE 1ST STAGE WHEEL HAD TO BE FORCED APART TO BREAK IT LOOSE OF THE 2ND STAGE NOZZLE. FRACTURES OF THE BLADE TIPS APPEARED TO BE CAUSED BY ELEVATED TEMPERATURE CREEP RESULTING FROM EITHER TRANSIENT OVERTEMPERATURE OR OVERSPEED CONDITIONS.

Full Narrative

HELICOPTER WAS ON ROUTINE POLICE PATROL WHEN ENGINE FAILED AND IT AUTOROTATED TO A ROUGH LANDING ON A ROCKY BEACH. THE 1ST STAGE OF THE GAS PRODUCER SECTION OF THE TURBINE WAS FOUND FROZEN. THE TURBINE WHEEL BLADES WERE RUBBING & SEIZED TO THE 1ST STAGE TURBINE SHROUD OF THE 2ND STAGE NOZZLE ASS'Y. PIECES OF THE TURBINE BLADE'S TRAILING EDGE TIPS WERE MISSING & THERE WAS A METAL BUILDUP ON THE 2ND STAGE NOZZLE BLADE TRACK AREA. DURING DISASSEMBLY THE 1ST STAGE WHEEL HAD TO BE FORCED APART TO BREAK IT LOOSE OF THE 2ND STAGE NOZZLE. FRACTURES OF THE BLADE TIPS APPEARED TO BE CAUSED BY ELEVATED TEMPERATURE CREEP RESULTING FROM EITHER TRANSIENT OVERTEMPERATURE OR OVERSPEED CONDITIONS.

Flight

Event TypeAccident
Event Time13:30 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftHughes 369B
Tail NumberN1108T
Aircraft CategoryHeli
DamageSubstantial
OperatorSondma County Sheriff
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats4

People & Injuries

Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 36 · First Class

Conditions

ConditionsVMC
LightDaylight
Wind325° @ 15 kt
Visibility25 sm
CeilingNone
Temperature / Dew Point15 C / 0 C
Altimeter30.00 inHg

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Appendix: Source Data