Primary finding
Probable cause
Improper rate of descent and lack of flare while conducting a forced landing. Factors were: partial power loss due to stuck exhaust valves caused by engine overheat from improper leaning.
Investigator assessment
Analysis narrative
Following takeoff, while conducting a local training flight, the engine began to run rough at an altitude of approximately 300 feet agl. The flight instructor took control and conducted a forced landing in a field. Touch down was hard and the aircraft nosed over. Examination of the engine revealed two cylinders with exhaust valves stuck open. Evidence of overheat was present and all engine cooling devices were properly in place. The operator had briefed all his instructors on leaning to peak power due to high altitude performance degradation.
Source record
Factual narrative
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