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NTSB Report
May 19, 1991 · Bell 47G-3B-1 · N73903
Malott, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 19, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Malott, WA
Aircraft
Bell 47G-3B-1
Tail Number
N73903
Operator
Cascade Helicopter
Injuries
None
Aircraft Damage
Destroyed
NTSB Number
SEA91LA109
DURING AN AERIAL APPLICATION FLIGHT, THE ENGINE SUDDENLY LOST POWER. THE PILOT TRIED TO MANEUVER TO AN OPEN AREA, HOWEVER, THE HELICOPTER COLLIDED WITH TREES. POST CRASH INVESTIGATION REVEALED THAT THE HELICOPTER EXPERIENCED AN IN FLIGHT FIRE. IT WAS FOUND THAT A SECTION OF THE AUXILIARY FUEL PUMP CASING BROKE AWAY IN THE AREA WHERE THE FUEL LINE FITTING SCREWS INTO THE PUMP. DUE TO FIRE DAMAGE, USEFUL FACTURE TOPOGRAPHY TO DETERMINE THE MODE OF FAILURE WAS DESTROYED.
NTSB Probable Cause
AN UNDETERMINED FAILURE OF THE FUEL PUMP CASING RESULTING IN AN IN FLIGHT FIRE AND LOSS OF ENGINE POWER.
Full Narrative
DURING AN AERIAL APPLICATION FLIGHT, THE ENGINE SUDDENLY LOST POWER. THE PILOT TRIED TO MANEUVER TO AN OPEN AREA, HOWEVER, THE HELICOPTER COLLIDED WITH TREES. POST CRASH INVESTIGATION REVEALED THAT THE HELICOPTER EXPERIENCED AN IN FLIGHT FIRE. IT WAS FOUND THAT A SECTION OF THE AUXILIARY FUEL PUMP CASING BROKE AWAY IN THE AREA WHERE THE FUEL LINE FITTING SCREWS INTO THE PUMP. DUE TO FIRE DAMAGE, USEFUL FACTURE TOPOGRAPHY TO DETERMINE THE MODE OF FAILURE WAS DESTROYED.
Flight
Event TypeAccident
Event Time09:21 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireIflt
Aircraft ExplosionIflt
Aircraft
AircraftBell 47G-3B-1
Tail NumberN73903
Aircraft CategoryHeli
DamageDestroyed
OperatorCascade Helicopter
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TVO-435-A1A · Reciprocating · 260
Seats3
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 46 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility12 sm
CeilingOvercast 2500 ft
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO