What happened
During a scheduled cargo transport from Buffalo to Beaver Falls, a twin engine airplane experienced a significant fire and subsequent explosion while maintaining cruising altitude. The incident forced the aircraft to descend rapidly, ultimately resulting in a crash into a cornfield situated near Mercer. The impact of the crash caused the total destruction of the airframe.
There were two fatalities among the crew members on board the aircraft during the accident.
Findings
Investigations into the wreckage identified several critical mechanical failures that led to the disaster. A fatigue fracture occurred within the exhaust system manifold, specifically involving part number 085072-39. This crack, measuring approximately three inches, allowed hot exhaust gases to escape into the wing structure.
This leak of high-temperature gas ignited a pre-existing leak in the fuel system, where lines and fittings were found to be leaking. The resulting fire within the wing was exacerbated by excessive temperatures and the presence of high obstructions. The primary cause of the accident was determined to be an inadequate aircraft inspection by maintenance staff, which allowed these critical component failures to go undetected.