On April 4, 2015, about 1131 Pacific daylight time, a Piper PA-28R-200, N5469T, sustained substantial damage during a forced landing following a reported loss of engine power, near the Santa Maria Public Airport (SMX) Santa Maria, California. The airplane was registered and operated by the pilot under the provisions of Title 14 Code of Federal Regulations Part 91. The two Airline Transport Pilots sustained minor injuries and the passenger was not injured. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight. The local flight originated from SMX about 1120. The pilot reported that during climb out, about 3,500 feet mean sea level (msl), the engine lost partial power, and he turned the airplane back towards the airport. Shortly thereafter, the pilot stated that the engine lost all power and he elected to initiate a forced landing to a nearby clearing. The airplane came to rest upright, in a strawberry field about 4 miles southeast from SMX. Examination of the airplane by a Federal Aviation Administration inspector revealed that the wings sustained substantial damage during the forced landing. The airplane was recovered to a secure storage facility for further examination. Further examination of the recovered wreckage by the National Transportation Safety Board investigator-in-charge revealed that both wings and the horizontal stabilizers were previously removed to facilitate transport of the wreckage. The engine remained attached to the airframe. Examination of the Lycoming Motors IO-360-C1C engine revealed that all accessories and cylinders remained attached to their respective mounts. Two cracks were observed on the upper portion of the engine crankcase near the number two cylinder mounting surface. The crankshaft would not rotate by hand. An oil quick drain oil valve was installed on the engine. According to the Piper Service Letter number 910, Subject Engine Quick Drain Valve, dated December 29, 1980, was issued to make maintenance personnel aware of the correct oil quick drain valve installment on the PA-28-200 model airplane. The letter then provides a sketch of the incorrect oil quick drain valve and the correct oil quick drain valve. According to the service letter, the oil quick drain valve installed on the airplane was consistent with the sketch of the incorrect valve. Further, Airworthiness Directive (AD) 81—11-02 R1, stated "to prevent possible loss of oil due to installation of an incorrect engine oil quick drain valve, to accomplish the following: Install two warning placards, one on each side of the engine mounts…"caution, unapproved oil drain valves can cause inadvertent draining when the gear is retracted-use only manufacturer approved part". The AD goes on to state the approved part number. The installed oil quick drain valve part number on the accident airplane did not match the approved part number. The AD states "if an incorrect valve is installed, replace it with the approved part number". Further, no warning placards were observed on the accident airplane's engine mounts. When the nose gear assembly was actuated into its up and locked position, the bolt connecting the nose gear assembly would strike the oil quick drain valve. Several impact marks were present on the oil quick drain valve and the nose gear assembly bolt, consistent with them striking each other. Oil residue was observed on the left lower portion of the engine cowling and on the belly of the airplane. A minimal amount of oil was observed in the oil filter and oil sump. No oil residue was observed on, or near the cracks in the crankcase. In summary, the examination of the engine revealed that an incorrect oil quick drain valve was installed. Postaccident examination of the recovered airframe and engine revealed no additional anomalies that would preclude normal operation. An FAA Inspector's review of the airplane's maintenance records revealed that oil quick drain valve was installed on April 2, 2015.