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NTSB Report
August 5, 1987 · Curtiss JN-4 · N3712
Riverside, CA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
August 5, 1987
Injury Outcomes
1 injury (1 minor injury)
Location
Riverside, CA
Aircraft
Curtiss JN-4
Tail Number
N3712
Operator
Wentworth Charles G
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX87DUG06
DURING A BUSINESS FLIGHT, THE ENGINE EXPERIENCED A LOSS OF ENGINE POWER. THE PILOT MADE A FORCED LANDING IN AN OPEN AREA WHERE DURING THE TOUCHDOWN, THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED. THE PLT STALLED THE ACFT WHILE STILL SEVERAL FT OFF THE GROUND. THE ACFT RT WING DROPPED AND THE ACFT TURNED RT BEFORE CRASHING IN A CONSTRUCTION SITE PARKING LOT. ACCORDING TO AN ENGINE OVERHAUL FACILITY, THIS ENGINE HAD A COOLANT PUMP LOCATED DIRECTLY ABOVE THE CARBURETOR. THIS PUMP HAD A HISTORY OF LEAKING, AND WOULD CAUSE A SUBSTANTIAL POWER LOSS WHEN NOT MAINTAINED CORRECTLY. THE LEAKING COOLANT PUMP WOULD INTRODUCE CONTAMINATES THROUGH SEVERAL PORTS IN THE CARBURETOR.
Full Narrative
DURING A BUSINESS FLIGHT, THE ENGINE EXPERIENCED A LOSS OF ENGINE POWER. THE PILOT MADE A FORCED LANDING IN AN OPEN AREA WHERE DURING THE TOUCHDOWN, THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED. THE PLT STALLED THE ACFT WHILE STILL SEVERAL FT OFF THE GROUND. THE ACFT RT WING DROPPED AND THE ACFT TURNED RT BEFORE CRASHING IN A CONSTRUCTION SITE PARKING LOT. ACCORDING TO AN ENGINE OVERHAUL FACILITY, THIS ENGINE HAD A COOLANT PUMP LOCATED DIRECTLY ABOVE THE CARBURETOR. THIS PUMP HAD A HISTORY OF LEAKING, AND WOULD CAUSE A SUBSTANTIAL POWER LOSS WHEN NOT MAINTAINED CORRECTLY. THE LEAKING COOLANT PUMP WOULD INTRODUCE CONTAMINATES THROUGH SEVERAL PORTS IN THE CARBURETOR.
Flight
Event TypeAccident
Event Time07:20 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCurtiss JN-4
Tail NumberN3712
Aircraft CategoryAir
DamageSubstantial
OperatorWentworth Charles G
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsCurtis Wright · OX-X6 · Reciprocating · 90
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 45 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Altimeter29.00 inHg
Observation Time21:00
Weather SourceWFAC