WARREN, AR, USA
N3399X
MOONEY MK21
AT CRUISE LEVEL FLT THE PLT RPTD A MALFUNCTIONING ENGINE. THE PLT WAS CLEARED TO DESCEND TO AN AIRPORT IN THE VICINITY. THE PRECAUTIONARY LANDING WAS INITIATED DUE TO AN OIL PRESSURE DECLINE. APPROACHING FOR THE LANDING THE PLT RPTD THE ENGINE COMPLETELY QUIT WHICH MADE A LANDINGAT THE AIRPORT IMPOSSIBLE. A TEARDOWN INSPECTION OF THE ENGINE REVEALED THAT THE NUMBER 1 CONNECTING ROD WAS BROKEN WITH SIGNS OF EXTREME OVER HEATING TO THE POINT OF MELTING AND PERFORMING THE CONNECTING ROD AND CAP. THE ROD BEARING WAS SEVERELY WORN TO A POINT OF BEING PAPER THIN. THE OIL JOURNAL WAS CLOGGED WITH METAL DEBRIS. THE LACK OF LUBRICATION WAS CONFINED TO THIS CYLINDER.
Source: NTSB Aviation Accident Database
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