Post-Takeoff Loss of Control and Nose-Down Impact (N5354P)

Accident Sequence

Following liftoff, the airplane appeared to stop climbing at approximately 90-100 feet above ground level. Its wings rocked side-to-side, and it subsequently pitched nose-down into the ground. The engine was heard operating until the moment of impact.

Post-Accident Examination

The mixture control was found in the full rich position. Density altitude was calculated as approximately 5,000 feet. An oil stain was discovered near the propeller governor. Compliance with Airworthiness Directive 90-04-06 and Lycoming Service Bulletin No. 488, regarding the propeller governor line and elbow fitting, was not confirmed (NCW). The engine was disassembled and examined. The propeller governor screen was blocked with numerous contaminants. Metallic flakes were present on the oil filter. The carburetor body was dirty, and the carburetor float attachment pin was worn. Spark plugs exhibited a rich fuel mixture condition. Magnet timing was measured at 3 degrees off specification. Intake and exhaust rocker arms were improperly installed. Piston rings were worn beyond service life limits, and the No. 2 cylinder top ring was broken. Multiple connecting rod caps and bearings were installed backwards. All crank pins and main bearings were worn beyond service limits. The data plate serial number did not match the engine case number. The airplane was purchased by the pilot on January 23, 1990.