BETHEL, AK, USA
N7763F
CESSNA 150
THE PILOT IN COMMAND/FLIGHT INSTRUCTOR REPORTED THAT THE ENGINE BEGAN TO RUN ROUGH ABOUT TWO HOURS INTO THE FLIGHT. FULL CARBURETOR HEAT WAS APPLIED AND THE ROUGHNESS DISAPPEARED. ABOUT 30 MINUTES LATER, THE ENGINE ROUGHNESS REAPPEARED. ENGINE INSTRUMENT INDICATIONS WERE NORMAL. THE ENGINE COUGHED AND SPUTTERED, BUT LITTLE FLUCTUATION IN RPM WAS NOTED. FULL CARBURETOR HEAT WAS ONCE AGAIN APPLIED BUT THE ENGINE QUIT AND ATTEMPTS AT RESTARTING WERE NOT SUCCESSFUL. THE ENGINE STARTED AND RAN NORMALLY (RESTRICTED TO LOW RPM DUE TO MOTOR MOUNT DAMAGE) DURING A POST ACCIDENT STATIC EXAMINATION AND OPERATIONAL CHECK. ALL ENGINE CONTROLS WERE INTACT. NO FOREIGN MATERIAL/CONTAMINANTS WAS FOUND IN THE WING TANKS, ENGINE FUEL STRAINER, AND CARBURETOR FINGER SCREEN. THE TEMPERATURE/DEW POINT AT THE TIME OF THE ACCIDENT WAS 44 DEG AND 30 DEG RESPECTIVELY. ACCORDING TO THE CARB ICING PROB CHART SERIOUS ICING AT CRUISE POWER WAS POSSIBLE AT THE AMBIENT CONDITIONS.
THE CARBURETOR ICING CONDITIONS AND THE DELAY BY THE PILOT IN COMMAND/CFI IN USING CARBURETOR HEAT.
Source: NTSB Aviation Accident Database
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