Cessna A150K N8380M accident near Mamou, Louisiana

Probable cause

The pilot's inadequate preflight inspection, which resulted in a partial loss of engine power due to fuel contamination.

NTSB analysis

The pilot reported that the engine experienced a partial loss of engine power after encountering turbulence during cruise flight. He noted that the engine continued to operate smoothly at idle speed, but was minimally responsive to multiple throttle movements. Specifically, a full application of the throttle would result in a momentary increase of engine power before the engine went back to idle speed. The pilot applied carburetor heat, which had no observed effect on engine operation. He made a forced landing in a rice field, during which the airplane nosed over. Postaccident examination of the carburetor and gascolator bowls revealed evidence of water and particulate contamination. The wing fuel tanks also contained water contamination. Additionally, an examination of the pilot's refueling container, located on his private airstrip, revealed water and particulate contamination. The filter assembly installed on the refueling container was also contaminated with particulate debris. The contamination in the fuel system, which should have been detected during a routine preflight inspection, likely resulted in the partial loss of engine power.

Text from the NTSB. Open the NTSB docket for CEN12LA388 for the full record.