NTSB Identification: FTW88IA078.
The docket is stored on NTSB microfiche number 37458.
Incident occurred Sunday, February 28, 1988 in GROSEBECK, TX
Probable Cause Approval Date: 01/25/1990
Aircraft: CESSNA T210M, registration: N761RP
Injuries: 1 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE PILOT MADE A FORCED LANDING FOLLOWING ENGINE FAILURE. TEARDOWN EXAMINATION SHOWED THE NO. 4 EXHAUST VALVE HEAD HAD SEPARATED FROM THE STEM. METAL DEBRIS WAS FOUND IN THE OIL SUMP. THE NO. 1 CONNECTING ROD WAS SEPARATED FROM THE CRANKSHAFT. THERE WAS EVIDENCE OF IMPROPER LUBRICATION IN THE VICINITY OF THE NO. 1 CONNECTING ROD CRANKSHAFT JOURNAL. THE OIL PUMP WAS INTACT AND AN ADEQUATE SUPPLY OF LUBRICATING OIL WAS AVAILABLE. BEFORE GOING THROUGH THE PISTON TOP, THE SEPARATED EXHAUST VALVE HEAD MADE NUMEROUS DENTS AND ABRASIONS ON THE PISTON HEAD AND CYLINDER DOME. THE RESULTANT SANDBLASTING EFFECT OBLITERATED THE FRACTURE SURFACES.

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

ENGINE ASSEMBLY,VALVE,EXHAUST..SEPARATION


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE

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