NTSB Identification: MKC86LA193.
The docket is stored on NTSB microfiche number 33300.
Nonscheduled 14 CFR
Accident occurred Monday, September 22, 1986 in OLD MONROE, MO
Probable Cause Approval Date: 04/25/1988
Aircraft: CESSNA T210M, registration: N6163N
Injuries: 3 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,VALVE,INTAKE..FAILURE,TOTAL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ENGINE ASSEMBLY,VALVE,INTAKE..FATIGUE


Contributing Factors

TERRAIN CONDITION..DITCH

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