NTSB Identification: MKC83LA137.
The docket is stored on NTSB microfiche number 23395.
Accident occurred Monday, June 27, 1983 in MARSHALL, MO
Aircraft: CESSNA T188C, registration: N9639J
Injuries: 1 Minor.

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 ENG FAILED WHILE ENROUTE TO SPRAY. THE ACFT WAS OBSERVED TO JETTISON ITS LOAD PRIOR TO IMPACTING TREES IN A WOODED PASTURE. METALLURGICAL EXAMINATION REVEALED THAT THE CRANKSHAFT, P/N631716, HAD FRACTURED FROM FATIGUE PROGRESSION THROUGH THE FORWARD CHEEK OF THE #3 MAIN BEARING JOURNAL. INITIATION HAD OCCURRED 0.047 INCHES BELOW THE FORWARD RADIUS SURFACE. NO METALLURGICAL ABNORMALITIES WERE FOUND AT THE ORIGIN SITE.

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

ENGINE ASSEMBLY,CRANKSHAFT..FATIGUE



Contributing Factors

OBJECT..TREE(S)

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