What happened
While on final approach, the pilot of N997<0xA0>75Q received instructions from the tower to perform a go-around. This instruction was issued because another aircraft had failed to respond to tower communications and remained on the runway.
During the maneuver, the pilot applied full throttle and closed the carburetor heat. At that moment, the engine sputtered and ceased operation. Because the other aircraft was still occupying the runway and ignoring instructions, the pilot attempted an emergency landing. The pilot banked the aircraft to the left and landed in snow-covered grass, which caused the aircraft to nose over.
The investigation
A post-accident investigation of the engine revealed no mechanical discrepancies. However, investigators noted that the magneto switch was set in the off position.