After takeoff, the pilot noted a partial loss of engine power and attempted to land in an open field; however, the airplane's landing gear struck trees and it collided with the roof of an occupied house. The pilot stated that the engine did not sputter, surge, or backfire, and the engine was just not producing full power. Examination of the airplane disclosed that there was a loose magneto cap with one screw missing, and the other two were only engaged by three threads. Interference was also found at the midpoint of the throttle control system as a result of the improper routing of that system in the airframe, and a misrigged carburetor heat box, which resulted in an inability to achieve full throttle movement at the carburetor.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:

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