What happened
The pilot reported that the aircraft's engine experienced mechanical trouble, necessitating an attempt at a forced landing on a freeway. During the landing rollout, the aircraft's left wing struck a metal center divider.
The investigation
An analysis of the engine oil was conducted to determine the nature of the mechanical failure. The results revealed high concentrations of silicon, iron, chromium, aluminum, and copper, along with a moderate concentration of tin.
Findings
The presence of these metals in the engine oil indicates significant internal engine wear or component failure. Engine mechanical failure was the primary factor leading to the forced landing attempt.