Cessna 170B N3035A accident near Ingleside, Texas

Probable cause

The loss of engine power during takeoff due to carburetor icing, which resulted in a forced landing.

NTSB analysis

The private pilot reported that the engine cylinders had been replaced before the accident flight and that the purpose of the flight was to continue a cylinder break-in period. The engine run-up and propeller check were completed during the taxi to the runway to keep the ground run-up to a minimum. After engine start, no anomalies were noted. The pilot stated that the break-in procedures called for lower cylinder head temperatures and less than full power at the beginning of takeoff. After the airplane took off and reached about 100 ft above ground level (agl), the pilot slowly reduced rpm and the manifold pressure to about 65 percent power. At 200 ft agl, the engine lost partial power. The engine briefly regained some power, but it then lost power again. The pilot executed a forced landing in mesquite tree-covered terrain.

A postaccident examination and functional test of the engine revealed no anomalies that would have precluded normal operation. The pilot stated that he believed the engine lost power due to carburetor ice, and the weather conditions at the time of the accident were conducive to serious carburetor icing at cruise power. It is likely that the engine lost power due to carburetor icing.

Text from the NTSB. Open the NTSB docket for CEN16LA078 for the full record.