Accident Overview
On June 23, 2012, at 1830 central daylight time, a Cessna model A150K airplane, registered as N8380M, was substantially damaged during a forced landing near Mamou, Louisiana. The commercial pilot, who was the sole occupant, was not injured. The airplane was operated under 14 Code of Federal Regulations Part 91 as a personal flight without a flight plan. Day visual meteorological conditions prevailed. The flight departed from the pilot's private airstrip near Mamou, Louisiana, around 1730.
Engine Power Loss
According to the pilot, the engine experienced a partial loss of power after encountering a momentary period of turbulence during cruise flight. The engine continued to operate smoothly at idle speed but was minimally responsive to throttle inputs. Full application of the throttle resulted in about 2,100 rpm for 2-3 seconds before returning to idle. The pilot engaged carburetor heat, which had no observed effect on engine operation.
Forced Landing and Damage
The pilot performed a forced landing in a rice field. During the landing, the airplane nosed over. The vertical stabilizer and rudder were substantially damaged.
Postaccident Examination
The engine, a Continental model O-200-A (serial number 199309-9-A), had accumulated 258.5 hours since its last major overhaul. Federal Aviation Administration inspectors examined the engine. Internal engine and valve train continuity was confirmed when the crankshaft was rotated. Compression and suction were noted on all cylinders. The magnetos were secure and produced spark. Upper spark plugs appeared normal. Induction tubing from the air filter housing to the carburetor had no obstructions. Cockpit engine controls showed mechanical continuity to engine components. Carburetor heat control continuity to the heat-box assembly was confirmed.
Examination of the carburetor and gascolator bowls revealed evidence of water and particulate contamination. The wing fuel tanks also contained water contamination. The pilot/owner's refueling container, located at his private airstrip, was found to have water and particulate contamination, and its filter assembly was contaminated with particulate debris.
Weather Conditions
The nearest weather station, Allen Parish Airport (KACP), approximately 15 miles northwest of the accident site, reported at 1815: calm wind, visibility 10 miles, clear skies, temperature 35°C, dew point 17°C, altimeter 29.83 inHg.