20010516009149A

(.19)On may 16, 2001, at 1939 central daylight time, a kirchner pietenpol aircamper home built airplane, N25157, was substantially damaged during a forced landing following a loss of engine power near Tulsa, Oklahoma. The airplane was owned and operated by the private pilot who was not injured. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 code of federal regulations part 91 personal flight. The flight originated from the sand ridge airport near collinsville, Oklahoma, at 1910, and was destined for the richard lloyd jones jr. airport, Tulsa, Oklahoma. Preliminary information indicates that while en route, the pilot observed a rise in engine oil temperature. The pilot elected to make a precautionary landing at the harvey young airport; however, engine RPM decreased to where altitude could not be maintained, and the pilot initiated a forced landing to a bean field about one mile northeast of the airport. During the landing, the airplane touched down "hard," nosed over, and came to rest inverted. Examination of the airplane by FAA inspectors who responded to the accident site, revealed that the landing gear had collapsed and partially separated. The right wing spar outboard of the lift strut was fractured, and the vertical stabilizer was damaged. (-23)the pilot stated he departed the collinsville, OK airport enroute to jenks, OK. Soon after departure he noticed the oil temperature was indicating maximum temperature. All other indications appearing normal he elected to continue the flight. Shortly thereafter the engine began losing power and the pilot elected to land in a bean field approximately one mile northeast of harvey young airport in Tulsa, OK. The pilot reported the aircraft stalled at approximately 10 feet in the air and impacted the ground in a right wing low attitude. Substantial damage was sustained to the landing gear, propeller and right wing. The pilot voluntarily disclosed that his medical certificate was invalid due to a heart condition. This report to be amended after engine tear down in accomplished. (.4) on may 16, 2001, at 1939 central daylight time, a kirchner pietenpol aircamper home built airplane, N25157, was substantially damaged during a forced landing following a loss of engine power near Tulsa, Oklahoma. The air plane was owned and operated by the pilot. The private pilot, sole occupant, was not injured. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 code of federal regulations part 91 personal flight. The flight originated from the sand ridge airport near collinsville, Oklahoma, at 1910, and was destined for the richard lloyd jones jr. airport, Tulsa, Oklahoma. While en route, the pilot observed a rise in engine oil temperature. The pilot elected to make a precautionary landing at the harvey young airport; however, engine RPM decreased to where altitude could not be maintained. The pilot initiated a forced landing to a bean field about one mile northeast of the airport. During the landing, the airplane touched down "hard," nosed over, and came to rest inverted. Examination of the airplane by FAA inspectors, who responded to the accident site, revealed that the main landing gear had collapsed and was partially separated. The right wing spar outboard of the lift strut was fractured, and the vertical stabilizer was damaged. An examination of the corvair automotive engine, by the owner, revealed a stuck oil cooler thermostat valve. The thermostat valve was found stuck in the position that would prevent oil from flowing through the oil cooler. Additionally, pieces of a broken piston ring were found in the engine's oil sump. Attempts to obtain a completed pilot/operator aircraft accident report, NTSB form 6120.1/2, from the pilot/owner were unsuccessful.