NTSB Identification: LAX92LA312.
The docket is stored on NTSB microfiche number 47129.
Accident occurred Wednesday, July 22, 1992 in LAS VEGAS, NV
Probable Cause Approval Date: 08/31/1993
Aircraft: PIPER PA-28R-201T, registration: N3074F
Injuries: 2 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.

THE PILOT WAS COMPLETING A VISUAL PERSONAL FLIGHT. HE RECEIVED VECTORS TO RUNWAY 19 FINAL APPROACH COURSE AND WHEN THE AIRPLANE WAS ABOUT 2 MILES FROM THE RUNWAY THRESHOLD, THE PILOT APPLIED ADDITIONAL THROTTLE. THE ENGINE MOMENTARILY RESPONDED AND THEN CONTINUED TO MISS. THE PILOT HEARD A MUFFLED EXPLOSION AND OBSERVED A VERY SMALL PUFF OF WHITE/BLUE SMOKE EMANATING FROM THE RIGHT SIDE OF THE ENGINE COWLING. THE ENGINE QUIT WHEN THE AIRPLANE WAS ABOUT 1 1/2 MILES FROM THE THRESHOLD AT 2,500 FEET MEAN SEA LEVEL. THE AIRPLANE'S ALTITUDE WAS INSUFFICIENT TO NEGOTIATE THE AIRPORT AND THE PILOT ELECTED TO LAND IN AN OPEN VACANT LOT. THE AIRPLANE BURST INTO FLAMES AFTER IT CAME TO REST. EXAMINATION OF THE ENGINE SHOWED THAT DURING THE RECENT TOP OVERHAUL THE MECHANICS INSTALLED THE WRONG CONNECTING ROD BOLTS THAT WERE IMPROPERLY TORQUED. THE OIL DRAIN PLUG CAME LOOSE WHILE IN FLIGHT CAUSING THE ENGINE TO SUSTAIN A CATASTROPHIC FAILURE. THE MECHANICS FAILED TO SAFETY THE OIL DRAIN PLUG.

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

THE FAILURE OF THE MAINTENANCE PERSONNEL TO SAFETY THE ENGINE OIL DRAIN PLUG AND THE POOR ENGINE OVERHAUL. FACTORS RELATING TO THIS ACCIDENT ARE: OIL STARVATION; THE FAILURE OF THE CONNECTING RODS; THE INCORRECT CONNECTING ROD BOLTS; AND THE CONNECTING ROD BOLTS UNDERTORQUE.

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