NTSB Identification: CHI88LA167.
The docket is stored on NTSB microfiche number 36705.
Accident occurred Sunday, July 17, 1988 in MANKATO, MN
Probable Cause Approval Date: 09/29/1989
Aircraft: CESSNA 177RG, registration: N2059Q
Injuries: 4 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.

AS THE PILOT LEVELED OFF AT HIS INTENDED CRUISE ALTITUDE, HE NOTED A LOSS OF OIL PRESSURE, THEN SAW OIL SPREAD UP OVER THE WINDSHIELD, RESTRICTING HIS VISIBILITY. THE PILOT PERFORMED EMERGENCY PROCEDURES, AND BEGAN DESCENDING TO THE NEAREST AIRPORT. DURING THE EMERGENCY DESCENT THE ENGINE SEIZED. THE PILOT WAS UNABLE TO REACH THE AIRPORT AND DESCENDED THROUGH SOME TREES BEFORE MAKING A FORCED LANDING IN A BEAN FIELD APPROXIMATELY 1/4 MILE FROM THE AIRPORT. THE LOSS OF OIL WAS DETERMINED TO BE DUE TO A CRACKED PROPELLER GOVERNOR OIL TUBE THROUGH WHICH OIL WAS PUMPED OVERBOARD.

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

LUBRICATING SYSTEM,OIL TUBING..CRACKED

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

FLUID,OIL..EXHAUSTION

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

FLUID,OIL..LEAK



Contributing Factors

LIGHT CONDITION..DARK NIGHT




Contributing Factors

OBJECT..TREE(S)

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