20011025028659A

(.19) On October 25, 2001, at 1940 central daylight time, a Cessna 152 single-engine airplane N67797, was substantially damaged when it impacted a fence during a forced landing following a loss of engine power while in cruise flight near bethany, Oklahoma. The airplane was registered to and operated by airone inc., of Oklahoma City, Oklahoma. The private pilot, who was the sole occupant, was not injured. Night visual meteorological conditions prevailed and a flight plan was not filed for the 14 code of federal regulations part 91 solo instructional flight. The cross-country flight originated from the wiley post airport, bethany, Oklahoma, at 1800, flew to duncan, Oklahoma, and was returning to the wiley post airport when the accident occurred. According to the operator, the pilot reported that the engine began to rumble and lose power. The pilot could not maintain altitude to make it to the airport and therefore, elected to land in a field. The pilot landed the airplane in a field where it impacted a barbed wire fence. The pilot reported that he could not see the fence because it was dark. According to the operator, the airplane sustained structural damage to the empennage and horizontal stabilizer, and the right elevator was torn from its hinges. (-23) on October 25, 2001, at 1940 central daylight time, a Cessna 152, N67797, was force landed in a field approximately five miles sw of Oklahoma City Will Rogers field. The pilot and only occupant, reported that the aircraft engine began to rumble and lose power during cruise, on a return flight to bethany, Oklahoma. The pilot reported that the aircraft could not maintain altitude, therefore, he elected to land in a field. Night visual meteorological conditions prevailed at the time the aircraft was landed, where it impacted a barbed wire fence. The aircraft sustained substantial damage, however, there were no injuries to the pilot. (.4) the private pilot reported that during a night cross-country flight, the engine began to lose power. The pilot could not maintain altitude to reach the airport, and therefore, elected to land in a field. The pilot landed the airplane in a field where it impacted a barbed wire fence. An FAA airworthiness inspector examined the engine with the assistance of an aircraft mechanic. The FAA inspector reported that they removed the #2 cylinder's ro cker arm cover and noted that "the exhaust valve adjuster 'lock nut' had loosened and come completely off." Review of a maintenance record entry dated may 21, 2000, revealed that the #2 cylinder had been removed, repaired, and reinstalled at an aircraft total time of 825.0 hours. On August 13, 2001, the airplane and engine underwent their most recent 100-hour inspection at an aircraft and engine total time of 1,077.0 hours. The aircraft total time at the time of the accident is unknown. According to the engine operator's manual, persons installing pushrods for a cylinder are instructed to recheck the tappet clearance after run-in and lock the valve clearance adjusting screw in place with the locknut.