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NTSB Report
June 29, 1992 · Bell-World 47D1 · N17301
Wenatchee, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 29, 1992
Injury Outcomes
No injuries (2 uninjured)
Location
Wenatchee, WA
Aircraft
Bell-World 47D1
Tail Number
N17301
Operator
Powder River Helicopters
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
SEA92LA141
WHILE TRANSITIONING FROM A HOVER TO FORWARD FLIGHT THE PILOT ENCOUNTERED DECAYING RPM AND ATTEMPTED TO EXECUTE AN EMERGENCY LANDING. DURING THE LANDING, THE TAILBOOM IMPACTED A TREE. THE PILOT REPORTED THAT HE SUSPECTED CARBURETOR ICING AS THE CAUSE OF THE POWER LOSS. THE ACCIDENT OCCURRED AT AN ELEVATION APPROXIMATELY 1000 FEET HIGHER THAN THE WENATCHEE AIRPORT WHICH LIES 5 MILES NORTHEAST. THE SURFACE WEATHER OBSERVATION AT THE AIRPORT TAKEN 15 MINUTES BEFORE THE ACCIDENT RECORDED A 63/59 DEGREE TEMPERATURE/DEW POINT WITH BROKEN/OVERCAST CEILINGS. THE BASE CEILING (BROKEN) WAS REPORTED AT 1800 FEET ABOVE THE AIRPORT ELEVATION.
NTSB Probable Cause
CARBURETOR ICE AND THE PILOT IN COMMAND'S NOT BEING ABLE TO MAINTAIN CLEARANCE. FACTORS CONTRIBUTING TO THE ACCIDENT WERE: CARBURETOR ICING CONDITIONS AND TREE(S).
Full Narrative
WHILE TRANSITIONING FROM A HOVER TO FORWARD FLIGHT THE PILOT ENCOUNTERED DECAYING RPM AND ATTEMPTED TO EXECUTE AN EMERGENCY LANDING. DURING THE LANDING, THE TAILBOOM IMPACTED A TREE. THE PILOT REPORTED THAT HE SUSPECTED CARBURETOR ICING AS THE CAUSE OF THE POWER LOSS. THE ACCIDENT OCCURRED AT AN ELEVATION APPROXIMATELY 1000 FEET HIGHER THAN THE WENATCHEE AIRPORT WHICH LIES 5 MILES NORTHEAST. THE SURFACE WEATHER OBSERVATION AT THE AIRPORT TAKEN 15 MINUTES BEFORE THE ACCIDENT RECORDED A 63/59 DEGREE TEMPERATURE/DEW POINT WITH BROKEN/OVERCAST CEILINGS. THE BASE CEILING (BROKEN) WAS REPORTED AT 1800 FEET ABOVE THE AIRPORT ELEVATION.
Flight
Event TypeAccident
Event Time08:00 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell-World 47D1
Tail NumberN17301
Aircraft CategoryHeli
DamageDestroyed
OperatorPowder River Helicopters
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · GV335AB · Reciprocating · 200
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 38 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind120° @ 11 kt
Visibility10 sm
CeilingBroken clouds 1800 ft
Temperature / Dew Point63 F / 59
Altimeter29.00 inHg
Observation Time14:45
Weather SourceWFAC