What happened
The pilot was operating a Cessna 182N when the aircraft suffered an abrupt loss of engine power. With no time to select a suitable field, the pilot executed a forced landing onto a nearby highway. The maneuver required significant skill as the pilot had to navigate around overhead power lines and avoid oncoming vehicular traffic. Despite the difficult circumstances, the aircraft touched down hard, resulting in substantial damage to the airframe.
The investigation
Post-accident examination of the engine revealed critical mechanical failures. Investigators found that the piston pins within the engine had inadequate clearance. This manufacturing or assembly defect led to the failure of two connecting rods. The simultaneous failure of these components caused the complete loss of power in the engine. Notably, the engine had only approximately 2.5 hours of operating time since its last overhaul, suggesting the issue was not due to wear but rather an initial setup error.
Findings
The primary factor contributing to the accident was the mechanical failure of the connecting rods. This failure was directly attributed to piston pins with insufficient clearance. The engine's low time since overhaul indicates that the defect likely originated during the recent overhaul process rather than from operational wear. The pilot's decision to land on a highway was necessitated by the sudden and total loss of propulsion.