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The National Transportation Safety Board said on Thursday it has found evidence of fatigue cracks in a key part of a UPS MD-11 cargo jet that crashed this month in Kentucky, an important clue into the cause of the incident that killed 14.

Air safety experts said the discovery of fatigue cracks in a support structure on the left pylon, which connects to the wing and the plane's engine, is a significant finding in the investigation into the November 4 crash in Louisville.

Besides evidence of fatigue cracks, which preceded the accident in the left pylon aft mount lug, the NTSB also said in its preliminary report that it found areas of overstress failure.

As a result, one side of the pylon's supports failed

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