Piper PA 28-180 N32150 accident near Bend, Oregon

Probable cause

A partial loss of engine power due to carburetor icing, which resulted from the pilot’s failure to apply carburetor heat after takeoff and during the climb.

NTSB analysis

The private pilot reported that, about 4 to 5 minutes after takeoff for the personal flight and while climbing to 6,000 ft mean sea level (msl), the engine started to "shake and roll," and the rpm reduced from about 2,400 to 1,800 rpm. The pilot then reversed course to return to the airport. The pilot turned on the carburetor heat and enriched the fuel mixture, which did not restore full engine power. The rpm then dropped to between about 1,300 and 1,200, which was insufficient to maintain altitude. As the pilot approached the airport, he realized that the airplane was not going to reach the runway, so he executed an off-airport landing, during which the landing gear and the right wing separated from the fuselage.

A postaccident examination of the engine and fuel system did not reveal any mechanical anomalies or malfunctions that would have precluded normal operation. Weather conditions from the surface to 10,000 ft msl were conducive to the accumulation of moderate-to-severe carburetor icing. Therefore, it is likely that carburetor ice accumulated during the climb, which resulted in a partial loss of engine power. It is likely that the pilot's delayed use of carburetor heat was insufficient to clear the ice before the return to the airport.

Text from the NTSB. Open the NTSB docket for WPR15LA008 for the full record.