NTSB Identification: CHI87LA211.
The docket is stored on NTSB microfiche number 34544.
Accident occurred Saturday, September 12, 1987 in JEFFERSON, WI
Probable Cause Approval Date: 10/06/1988
Aircraft: CESSNA 172K, registration: N84352
Injuries: 2 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 AIRCRAFT WAS EN ROUTE ON A PERSONAL CROSS COUNTRY FLIGHT WHEN IT EXPERIENCED AN ENGINE FAILURE AND WAS FORCED TO MAKE AN EMERGENCY LANDING IN AN ALFALFA FIELD. THE AIRCRAFT LANDED LONG AND COLLIDED WITH A TELEPHONE POLE AND FENCE AT THE END OF THE FIELD. THE ENGINE FAILURE WAS DUE TO AN EXHAUST VALVE WHICH SEPARATED AND ENTERED THE COMBUSTION CHAMBER, SEVERELY DAMAGING THE PISTON AND CYLINDER HEAD.

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

ENGINE ASSEMBLY,VALVE,EXHAUST..FAILURE,TOTAL

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

ENGINE ASSEMBLY,VALVE,EXHAUST..SEPARATION

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

ENGINE ASSEMBLY,PISTON..RUPTURED


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