WALLA WALLA, WA, USA
N736KG
CESSNA 172XP
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.
Source: NTSB Aviation Accident Database
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