NTSB Identification: FTW84LA402.
The docket is stored on NTSB microfiche number 27486.
Accident occurred Wednesday, September 26, 1984 in SAN AUGUSTINE, TX
Aircraft: CESSNA T210N, registration: N6399Y
Injuries: 2 Serious.

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 PILOT MADE A FORCED LANDING IN A FIELD WHILE ON A IFR FLIGHT AFTER HIS ENGINE FAILED. THE AIRCRAFT LANDED SHORT OF THE SELECTED TOUCHDOWN POINT, IMPACTED TREES AND EXPERIENCED A HARD LANDING. IT THEN CAUGHT FIRE AND BURNED. SUBSEQUENT ENGINE EXAMINATION REVEALED THE CRANKSHIFT SEPARATED DURING FLIGHT DUE TO HIGH CYCLIC METAL FATIGUE CRACKING. THE CRACK ORIGINATED ABOUT 0.044 INCH BELOW THE SURFACE IN THE RADIUS AT THE FORWARD END OF THE NO. 3 MAIN BEARING JOURNAL. THE ORIGIN OF THE FATIGUE CRACK WAS IN AN AREA WHICH WAS FREE OF MICROSTRUCTURAL DEFECTS. THE CRANKSHAFT MET THE ENGINEERINGSPECIFICATIONS FOR MATERIAL, HARDNESS, AND NITRIDE THICKNESS.

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

ENGINE ASSEMBLY,CRANKSHAFT..SEPARATION

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

OBJECT..TREE(S)

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

ENGINE ASSEMBLY,CRANKSHAFT..FATIGUE


Contributing Factors

FLARE..MISJUDGED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE

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