OLD MONROE, MO, USA
N6163N
CESSNA T210M
THE PIC HAD INITIATED HIS DESCENT OT HIS DESTINATION ARPT WHEN HE RPTD EXPERIENCING ENG PBLMS. THE ROUGH RUNNING ENG FINALLY QUIT AND THE PIC MADE A FORCED LNDG TO AN OPEN FLD. THE SUBSEQUENT LNDG ENCOUNTERED A DITCH AND THE NOSE GEAR COLLAPSED. EXAM OF THE ENG REVEALED THAT THE EXHAUST VALVE OF ONE OF THE CYLINDERS HAD FAILED IN FATIGUE. METALLUGICAL EXAM NOTED THAT IT WAS A LOW STRESS, HIGH CYCLE FATIGUE FAILURE OF THE EXHAUST VALVE STEM NEAR THE VALVE FACE. THE ENG HAD BEEN COMPLETELY OVHLD 60 OPERATIONAL FLT HRS PRIOR TO THIS FAILURE. VALVES UTILIZED DUG OVHL MET MNFGRS SPEC.
Source: NTSB Aviation Accident Database
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