HASTINGS, FL, USA
N8841S
AIR TRACTOR AT-301
WHILE ON AN AERIAL APPLICATION FLT SHORTLY AFTER TAKEOFF, THE ENG LOST POWER. THE PLT THEN DUMPED THE LOAD OF FERTILIZER & LANDED THE ACFT IN A FIELD. AFTER TOUCHDOWN IT NOSED OVER & CAME TO REST. EXAMINATION OF THE ENG REVEALED THAT THE NO. FOUR CYLINDER EXHAUST VALVE ROCKER ARM SUPPORT FAILED PREVENTING THE VALVE FROM OPENING. AS A RESULT OF THE EXCESS PRESSURE INSIDE THE CYLINDER WHEN THE INTAKE VALVE OPENED. THE EXHAUST WAS FORCED THROUGH THE INTAKE SYSTEM RESULTING IN ENG BACKFIRING.
Source: NTSB Aviation Accident Database
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