On April 3, 2019, about 1000 central daylight time, a Piper PA-28R-200 airplane, N41AT, sustained minor damage during a forced landing following a loss of engine power near Prairieville, Louisiana. The pilot was seriously injured. The airplane was registered to and operated by the pilot as a Title 14 Code of Federal Regulations Part 91 personal flight. Day visual meteorological conditions prevailed. The flight was not operated on a flight plan. The flight originated from Baton Rouge Metropolitan Airport (BTR), Baton Rouge, Louisiana, about 0950 and was destined for the Louisiana Regional Airport (REG), Gonzales, Louisiana. The pilot reported that he had picked up the airplane after the annual inspection was completed. About 5 minutes after takeoff, the engine started to run rough and almost immediately seized. He setup for a forced landing on an interstate highway; however, on final approach, the airplane struck a semi-tractor trailer. The airplane subsequently contacted the ground adjacent to the highway and impacted a tree. A postaccident examination performed by a Federal Aviation Administration (FAA) inspector determined that the engine oil drain valve was damaged which had resulted in a loss of engine oil. The valve damage was consistent with contact from the nose landing gear during retraction. Further investigation revealed that the installed drain valve did not correspond to the airframe manufacturer's requirements. The installed valve protruded about 1-1/8 inches from the engine, while the manufacturer specified valve protruded about 1/2 inch. In addition, the required warning placard related to the oil valve installation was not present on the engine mount. A review of the airplane maintenance records revealed that an annual inspection was completed the day before the accident. The entry noted that the oil valve had "stuck open" during the oil change and a new one was installed. It also noted that "clearance with landing gear [was] verified during retract tests." In December 1980, Piper Aircraft issued Service Letter No. 910 which notified owner/operators of the installation of incorrect oil drain valves on PA-28R-200 airplanes. The service letter specifically noted the possibility of damage to the valve during nose landing gear retraction and a loss of engine oil during flight. The service letter recommended inspection of the drain valve to ensure that the correct valve was installed and replacement of any incorrectly installed valves. In addition, the service letter provided for the installation of warning placards on each side of the engine mount in the area of the drain valve in order to advise maintenance personnel. In October 1981, the FAA issued airworthiness directive 81-11-02 R1 requiring inspection of the engine oil drain valves and installation of the warning placards as specified in the previously issued service letter. The current airplane service manual, revision dated January 2008, included a cautionary note regarding the engine oil drain valve. Specifically, the manual advised personnel to verify that the correct valve was installed and warned that the installation of an incorrect valve may damage the sump or the drain valve. It noted the possibility of a loss of engine oil and engine seizure in such instances. The manual also included the warning placard as part of the engine installation diagram.