RIVERSIDE, CA, USA
N3712
CURTISS JN-4
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.
Source: NTSB Aviation Accident Database
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