Synopsis
The pilot was landing at a private grass strip. Witnesses described the approach as hot and high. The engine lost power when the pilot attempted to execute a go-around. The pilot landed long, applied maximum braking to avoid structures at the end of the runway, and the airplane nosed over.
Investigation
The investigation indicated that the carburetor heat control was jammed in the off position. The pilot stated that he pulled the carburetor heat control to the off position to cycle it, along with the mixture, during his unsuccessful attempt to restart the engine. He left the carburetor heat control in the off position to concentrate on the forced landing from a low altitude. The airplane was placarded with a caution that carburetor heat was required for takeoffs and landings.
Carburetor Icing Assessment
There was a slight risk of light carburetor icing based on temperature and dew point values. However, with the high atmospheric temperature (97 degrees), a sudden, maximum temperature drop of 60 degrees would have resulted in a carburetor temperature above freezing (37 degrees).