NTSB Identification: FTW91LA140.
The docket is stored on NTSB microfiche number 45346.
Accident occurred Saturday, August 03, 1991 in LAREDO, TX
Probable Cause Approval Date: 03/24/1993
Aircraft: BEECH K35, registration: N8111R
Injuries: 1 Minor,3 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.

WHILE IN CRUISE FLIGHT, THE PILOT NOTED AN UNSUAL SMELL WHICH HE THOUGHT MIGHT HAVE BEEN ELECTRICAL OR SMOKE. SHORTLY THEREAFTER, THE AIRPLANE'S ENGINE OIL PRESSURE DECREASED. THE POWERPLANT THEN STARTED TO VIBRATE AND THE PILOT SHUT IT OFF. THE PILOT WAS COMMUNICATING WITH AIR TRAFFIC CONTROL AND WAS ATTEMPTING A PRECAUTIONARY LANDING AT AN AIRPORT WHEN THE FORCED LANDING OCCURRED. THE AIRPLANE WAS LANDED IN AN OPEN FIELD APPROXIMATELY ONE MILE FROM THE END OF THE RUNWAY THAT THE PILOT HAD BEEN CLEARED TO LAND ON. THE AIRPLANE FLIPPED OVER DURING THE LANDING ROLL ON THE UNSUITABLE TERRAIN. POST ACCIDENT EXAMINATION REVEALED THAT AN 'O' RING IN THE OIL FILTER ADAPTOR ASSEMBLY WAS CRUSHED AND THE ENGINE OIL ESCAPED AT THAT DAMAGED AREA CAUSING THE LOSS OF POWER. NO OIL REMAINED IN THE ENGINE. THE ADAPTOR ASSEMBLY HAD BEEN WORKED ON THE DAY BEFORE THE FLIGHT BY OTHER MAINTENANCE PERSONNEL.

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

THE IMPROPER INSTALLATION OF THE OIL FILTER ADAPTOR 'O' RING (SEAL) BY OTHER MAINTENANCE PERSONNEL WHO DISTORTED IT. A FACTOR WAS THE ROUGH, UNEVEN TERRAIN.

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