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NTSB Report
March 31, 1989 · Hughes 369D · N5108E
Vallejo, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 31, 1989
Injury Outcomes
No injuries (2 uninjured)
Location
Vallejo, CA
Aircraft
Hughes 369D
Tail Number
N5108E
Operator
Helinet
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX89LA141
DURING AN AIR TAXI CARGO FLIGHT ENGINE POWER WAS SUDDENLY LOST & THE PILOT AUTOROTATED TO A LANDING ON A WET MARSH. AS THE AIRCRAFT CAME TO REST THE MAIN ROTORS SEVERED THE TAIL BOOM. EXAM OF THE ENGINE REVEALED THAT THE PC TUBE ASSEMBLY, P/N 6848471, HAD FAILED AT THE SCROLL FITTING FERRULE, & THIS BROKEN LINE CONDITION PRODUCED AN IMMEDIATE LOSS OF ENGINE POWER. THE PC TUBE HAD A TOTAL OF 11.8 HOURS OF USE SINCE BEING INSTALLED/MANUFACTURED. A METALLURGICAL FAILURE ANALYSIS REVEALED THAT THE PC TUBE HAD FAILED IN FATIGUE.
NTSB Probable Cause
FATIGUE FAILURE OF A DEFECTIVE PC TUBE ASSEMBLY RESULTING IN A LOSS OF ENGINE POWER. A CONTRIBUTING FACTOR WAS THE UNSUITABLE TERRAIN.
Full Narrative
DURING AN AIR TAXI CARGO FLIGHT ENGINE POWER WAS SUDDENLY LOST & THE PILOT AUTOROTATED TO A LANDING ON A WET MARSH. AS THE AIRCRAFT CAME TO REST THE MAIN ROTORS SEVERED THE TAIL BOOM. EXAM OF THE ENGINE REVEALED THAT THE PC TUBE ASSEMBLY, P/N 6848471, HAD FAILED AT THE SCROLL FITTING FERRULE, & THIS BROKEN LINE CONDITION PRODUCED AN IMMEDIATE LOSS OF ENGINE POWER. THE PC TUBE HAD A TOTAL OF 11.8 HOURS OF USE SINCE BEING INSTALLED/MANUFACTURED. A METALLURGICAL FAILURE ANALYSIS REVEALED THAT THE PC TUBE HAD FAILED IN FATIGUE.
Flight
Event TypeAccident
Event Time17:25 PST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN5108E
Aircraft CategoryHeli
DamageSubstantial
OperatorHelinet
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · C250-C20B · Turboshaft · 420
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 32 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO