NTSB Identification: BFO88LA045.
The docket is stored on NTSB microfiche number 37432.
Accident occurred Wednesday, May 11, 1988 in YORKTOWN, VA
Probable Cause Approval Date: 09/11/1989
Aircraft: MOONEY M-20J, registration: N567MM
Injuries: 1 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.

THE PLT WAS RETURNING TO THE ARPT AFTER A 20 MINUTE LOCAL FLIGHT. ABOUT 5 MILES FROM THE ARPT HE NOTICED THE OIL PRES/TEMP GAGES INDICATED ZERO EVEN AFTER HE CHECKED THE CIRCUIT BREAKERS-SHORTLY AFTERWARD THE ENGINE BEGAN TO LOSE POWER AND VIBRATE SEVERELY. THE PLT SHUT THE ENG DOWN AND LANDED IN A FIELD. EXAMINATION OF THE ACFT REVEALED THERE WAS OIL LEAKAGE THROUGH A SPLIT IN THE OIL GASKET LOCATED BETWEEN THE OIL FILTER CONVERTER PLATE AND ITS MOUNTING FLANGE. THERE WAS FAILURE OF THE CYL NO. 4 CONNECTING ROD BEARING BECAUSE OF THE LACK OF LUBRICATION.

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

LUBRICATING SYSTEM,OIL FILTER/SCREEN..OVERTORQUE

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

MAINTENANCE..IMPROPER

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

LUBRICATING SYSTEM,OIL GASKET..FRACTURED

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

FLUID,OIL..STARVATION

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

ENGINE ASSEMBLY,BEARING..FAILURE,TOTAL

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