Flight Purpose
The flight was intended to complete a biennial flight review (BFR) for the owner of the airplane.
Sequence of Events
While en route to the destination airport, the airplane began to shake several times, after which the engine lost power. At an altitude of 1,200 feet, the certified flight instructor (CFI) prepared for a forced landing to a field. Just prior to touchdown, the airplane entered a "full stall situation" and impacted the bank of a ravine.
Post-Accident Examination
Examination of the airplane revealed fuel in the gascolator, carburetor bowl, and fuel lines to the engine. The engine was test run on the airframe; it started and ran continuously for several minutes without hesitation through a range of power settings from 700 to 2,150 RPM.
Probable Cause
No probable cause was stated in the source.