Incident
A pilot was conducting a cross-country flight when the engine experienced a loss of power. The pilot executed a forced landing onto a road. During the landing roll, the aircraft collided with a fence and subsequently came to rest in a ditch.
Examination
Post-accident inspection of the engine disclosed extensive detonation damage in cylinders 3, 4, and 6. A sample of the fuel was taken for analysis. The sample contained a noticeable quantity of residue particles composed of silicon, iron, and aluminum. Despite the presence of these particles, the fuel sample met the minimum ASTM standards for 100LL aviation fuel.