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NTSB Report
August 17, 1990 · Aerospatiale AS-350-B · N26492
Juneau, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 17, 1990
Injury Outcomes
No injuries (6 uninjured)
Location
Juneau, AK
Aircraft
Aerospatiale AS-350-B
Tail Number
N26492
Operator
Temsco Helicopter
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC90LA147
SHORTLY ATER TAKEOFF, THE HELICOPTER EXPERIENCED A COMPLETE ENGINE FAILURE. THE PILOT MADE AN EMERGENCY LANDING ONTO AN OPEN LOT. THE ENGINE FAILURE WAS DUE TO A FAILURE AND SEPARATION OF THE TURBINE INTERMEDIATE PINION DRIVEN GEAR WEB UNIT.
NTSB Probable Cause
FAILURE OF THE FREE TURBINE INTERMEDIATE PINION DRIVEN GEAR AND SUBSEQUENT DISINTEGRATION OF THE FREE TURBINE ASSEMBLY.
Full Narrative
SHORTLY ATER TAKEOFF, THE HELICOPTER EXPERIENCED A COMPLETE ENGINE FAILURE. THE PILOT MADE AN EMERGENCY LANDING ONTO AN OPEN LOT. THE ENGINE FAILURE WAS DUE TO A FAILURE AND SEPARATION OF THE TURBINE INTERMEDIATE PINION DRIVEN GEAR WEB UNIT.
Flight
Event TypeAccident
Event Time09:15 AKDT
Nearest Airport5nm W
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale AS-350-B
Tail NumberN26492
Aircraft CategoryHeli
DamageSubstantial
OperatorTemsco Helicopter
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · ARRIEL 1B · Turboshaft · 650
Seats6
People & Injuries
Injury SummaryNo injuries (6 uninjured)
Fatal0
Serious0
Minor0
Uninjured6
Total6
Crew 1Age 25 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility20 sm
CeilingBroken clouds 4000 ft
Temperature / Dew Point59 / 54
Altimeter29.00 inHg
Weather SourcePILO