Overview
An instructor and a private-rated student were practicing touch-and-go landings. During the third approach, while abeam the runway numbers on the downwind leg, the engine stopped producing power. The instructor instructed the student to fly toward the runway while attempting to restart the engine, but the restart was unsuccessful. A forced landing was executed in an open field.
Damage
During the landing roll, the nose landing gear collapsed, and one main landing gear was torn away from the aircraft. The extent of other damage is not specified in the report.
Post-Accident Examination
An FAA inspector examined the engine after the accident. The inspector noted that the spark plug electrodes were white in color. Further testing was conducted: the engine was operated with a very lean mixture setting, and afterward the spark plug electrodes exhibited the same white coloration as those observed after the accident.