What happened
The aircraft experienced an in-flight engine failure that necessitated a forced landing. During the approach for this emergency landing, the pilot chose not to fully extend the landing gear. This decision was made because the condition of the available landing area required a more precise touchdown than a full gear extension might have allowed.
The investigation
Following the accident, investigators examined the failed engine to determine the root cause of the mechanical failure. The inspection revealed that the number two connecting rod bearing strap had failed due to fatigue. This initial failure was followed by the subsequent failure of the remaining connecting rods, leading to complete engine shutdown.
Findings
The primary factor in this incident was the structural failure of the engine components. The connecting rod bearing strap fractured due to fatigue, which cascaded into a total loss of power. The pilot's decision to delay full gear extension was a tactical choice based on the terrain, but the underlying cause remained mechanical.
Safety message
Routine maintenance and inspection of engine internal components are critical to preventing catastrophic failures caused by metal fatigue.