Accident Details
A student pilot was conducting a cross-country flight when, after approximately 35 minutes of flight, a loud knocking noise was heard from the engine. The pilot reduced power, which lessened the noise, but the engine continued to operate roughly.
Landing Attempt
The student selected a mowed field for a forced landing. During the landing roll, the aircraft collided with a fence and then entered rough, rocky terrain before coming to a stop.
Post-Accident Inspection
Examination of the engine revealed one push rod was bowed approximately 2 inches. Evidence of oil spillage was noted. The oil sump still contained six quarts of oil. No other malfunctions were observed in the engine or airframe.