NTSB Identification: SEA88LA071.
The docket is stored on NTSB microfiche number 36461.
Accident occurred Sunday, April 10, 1988 in WALLA WALLA, WA
Probable Cause Approval Date: 06/09/1989
Aircraft: CESSNA 172XP, registration: N736KG
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.

DURING DESCENT FOR LANDING THE PILOT NOTED A SURGE COMING FROM THE ENGINE AREA, ACCOMPANIED BY AN INCREASE IN RPM'S. BOTH THE OIL TEMPERATURE AND THE OIL PRESSURE GAUGES WERE READING ZERO. THE CYLINDER HEAD TEMPERATURE HAD REACHED 500 DEGREES AND SMOKE WAS COMING FROM THE ENGINE AREA. THE PILOT THEN SHUT DOWN THE ENGINE. LANDING WAS ACCOMPLISHED ONTO A SOFT COW PASTURE. DURING LANDING ROLL THE AIRCRAFT NOSED OVER INVERTED. METALLURGICAL EXAMINATION REVEALED HEAT DAMAGE AND OVERSTRESS FRACTURES OF THE COMPONENTS EXAMINED. THE OIL PUMP DRIVE KEY WAS FOUND TO HAVE SHEARED.

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

LUBRICATING SYSTEM,OIL PRESSURE PUMP..SHEARED

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

FLUID,OIL..NO PRESSURE


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