NTSB Identification: MKC86LA015.
The docket is stored on NTSB microfiche number 29150.
Accident occurred Thursday, October 24, 1985 in WARREN, AR
Aircraft: MOONEY MK21, registration: N3399X
Injuries: 1 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.

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.

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

ENGINE ASSEMBLY,BEARING..FAILURE,TOTAL

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL

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

LUBRICATING SYSTEM..FAILURE,PARTIAL

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

PROPER GLIDEPATH..NOT MAINTAINED..PILOT IN COMMAND

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

FLUID,OIL..STARVATION


Contributing Factors

TERRAIN CONDITION..GROUND

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