NTSB Identification: LAX91LA121.
The docket is stored on NTSB microfiche number 43374.
Accident occurred Monday, February 25, 1991 in MESA, AZ
Probable Cause Approval Date: 12/30/1992
Aircraft: NORTH AMERICAN T-28B, registration: N138WW
Injuries: 1 Serious.
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 AIRCRAFT'S ENGINE UPPER CRANKCASE OIL BREATHER LINE FAILED DURING CRUISE FLIGHT, WHICH ALLOWED THE ENGINE'S OIL TO VENT OVERBOARD. THE LACK OF OIL CAUSED THE ENGINE TO SEIZE AND A TOTAL LOSS OF ENGINE POWER RESULTED. THE PILOT SET UP A POWER-OFF APPROACH TO A ROAD, BUT ALTERED THE AIRCRAFT'S COURSE DUE TO EXCESSIVE VEHICULAR TRAFFIC ON THE ROAD. HE ATTEMPTED TO LAND THE AIRCRAFT IN AN OPEN AREA. ON SHORT FINAL, THE PILOT SAW HIGH TENSION WIRES. TO AVOID COLLIDING WITH THE WIRES, THE PILOT PULLED THE NOSE OF THE AIRCRAFT UP. THE AIRCRAFT CLEARED THE WIRES, BUT THE AIRSPEED SLOWED CAUSING THE AIRCRAFT TO STALL, RESULTING IN A HARD LANDING.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: 1) THE FAILURE OF THE AIRPLANE'S ENGINE UPPER CRANKCASE OIL BREATHER LINE; 2) TOTAL LOSS OF ENGINE POWER CAUSED BY A LACK OF LUBRICATING OIL. A FACTOR IN THIS ACCIDENT WAS THE PILOT INADVERTANTLY STALLING THE AIRCRAFT TO AVOID A COLLISION WITH A WIRE.
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