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NTSB Report
May 16, 1984 · Bell 206L-1 · N1078N
Mt Mckinley Vil, AK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
May 16, 1984
Injury Outcomes
No injuries (3 uninjured)
Location
Mt Mckinley Vil, AK
Aircraft
Bell 206L-1
Tail Number
N1078N
Operator
Air Logistics of Ak
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC84LA071
THE HELICOPTER EXPERIENCED AN ENGINE FAILURE WHILE CRUISING AT ABOUT 600 FT AGL. THE PILOT MADE A FORCED LANDING DURING WHICH THE MAIN ROTOR BLADES COLLIDED WITH TREES. EXAMINATION OF THE AIRCRAFT FUEL SYSTEM REVEALED THAT THE CHECK VALVES LOCATED IN THE FUEL LINES WHICH TRANSFER FUEL FROM THE FORWARD FUEL CELL TO THE AFT FUEL CELL WERE WORN AND ONE OF THE CHECK VALVES WAS STUCK IN THE CLOSED POSITION. FURTHER EXAMINATION OF THE FUEL MANIFOLD, WHICH CONTAINS TWO MORE POPPET VALVES, REVEALED THAT ONE OF THE POPPET PARTICLES WAS FOUND IN ALL OF THESE CHECK VALVES. WITH BOTH POPPET VALVES CLOSED, THE FUEL BOOST PUMPS WILL NOT SUPPLY PRESSURE TO THE SINGLE FUEL LINE, TO THE FUEL PRESSURE TRANSDUCER OR TO THE ENGINE.
Full Narrative
THE HELICOPTER EXPERIENCED AN ENGINE FAILURE WHILE CRUISING AT ABOUT 600 FT AGL. THE PILOT MADE A FORCED LANDING DURING WHICH THE MAIN ROTOR BLADES COLLIDED WITH TREES. EXAMINATION OF THE AIRCRAFT FUEL SYSTEM REVEALED THAT THE CHECK VALVES LOCATED IN THE FUEL LINES WHICH TRANSFER FUEL FROM THE FORWARD FUEL CELL TO THE AFT FUEL CELL WERE WORN AND ONE OF THE CHECK VALVES WAS STUCK IN THE CLOSED POSITION. FURTHER EXAMINATION OF THE FUEL MANIFOLD, WHICH CONTAINS TWO MORE POPPET VALVES, REVEALED THAT ONE OF THE POPPET PARTICLES WAS FOUND IN ALL OF THESE CHECK VALVES. WITH BOTH POPPET VALVES CLOSED, THE FUEL BOOST PUMPS WILL NOT SUPPLY PRESSURE TO THE SINGLE FUEL LINE, TO THE FUEL PRESSURE TRANSDUCER OR TO THE ENGINE.
Flight
Event TypeAccident
Event Time10:55 AKDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206L-1
Tail NumberN1078N
Aircraft CategoryHeli
DamageSubstantial
OperatorAir Logistics of Ak
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsDetr. Diesel · 250-C28B · Turboshaft · 435
Seats7
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 41 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind10 kt, gusting 20 kt
Visibility100 sm
CeilingNone
Temperature / Dew Point48 / 0 C
Altimeter0
Weather SourcePILO