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US agency finds evidence that fatigue cracks were present in the fatal UPS cargo plane crash

The National Transportation Safety Board announced on Thursday that it had found fatigue cracks on a critical part of the UPS MD-11 cargo plane that crashed in Louisville, Kentucky on November 4, killing 14 people.

When the left engine separated from the wing, the bulk of the left pylon, which is a structural component that connects the engine to the fuselage or wing, was still attached. The NTSB found fatigue cracks on the left pylon's aft mounting lug.

UPS and FedEx grounded their MD-11 fleets in this month, as a precautionary measure and on the recommendation of U.S. aircraft manufacturer Boeing. The Federal Aviation Administration issued directives to temporarily ground the MD-11 and DC-10 because of their similar designs.

The preliminary report referred to the crash of a DC-10 jet by American Airlines in May 1979. It listed it under "similar incidents." On takeoff, Flight 191 at Chicago O'Hare Airport saw the left engine, pylon assembly and approximately three feet of leading edge of the right wing separate from the plane and fall onto the runway. U.S. safety officials have confirmed that they are investigating the maintenance history for the 34-year old UPS cargo plane, which was in Texas for repair weeks before it crashed in flames shortly after takeoff.

Jennifer Homendy, Chair of the NTSB, said this week that Boeing was doing additional modeling and tests as part of its investigation. Since its 1997 merger, Boeing has been the owner of the MD-11 program.

FedEx and UPS operate about 50 MD-11 cargo planes worldwide.

(source: Reuters)