Incident Overview
A pilot executed an emergency landing on a narrow road following an engine failure. During the landing, one of the landing gear touched down on the soft shoulder of the road. The landing gear subsequently failed, and the aircraft sustained substantial damage.
Engine Examination
Post-incident examination of the engine revealed that a cylinder had separated from the engine. The separation was caused by improperly torqued stud bolts. This condition allowed an over-stress condition to exist on a few studs that were properly torqued, leading to the cylinder failure.
Damage Assessment
The aircraft incurred substantial damage as a result of the landing gear collapse. No further details on the extent of damage were provided.
Investigation Findings
The investigation determined that the root cause of the engine failure was the improper torquing of stud bolts, which led to the cylinder separation. No other contributing factors were identified in the source material.