Incident Summary
While flying at approximately 2000 feet above ground level, the pilot observed a change in engine sound. The tachometer indication dropped below 1000 RPM, and the suction gauge fell below the green arc. In response, the pilot initiated an emergency landing. During the landing on soft terrain, the nose gear and left main gear collapsed.
Investigation Findings
Post-accident examination found no evidence of preimpact part failure or malfunction of the aircraft or engine. The engine was subsequently tested in an operational check and ran satisfactorily. The absence of mechanical issues suggests that the anomaly experienced in flight may have been temporary.
Weather Conditions
At the time of the incident, the temperature was 67 degrees Fahrenheit and the dew point was 42 degrees Fahrenheit. According to icing probability charts, these conditions are conducive to the formation of carburetor ice. Carburetor icing can affect engine performance and may cause changes in engine sound and instrument readings.
No probable cause was determined from the available information.