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Boeing flagged a crack in a part of the UPS fatal crash in 2011.

The National Transportation Safety Board announced on Wednesday that a cracked part on a UPS MD-11 cargo jet, which crashed in Kentucky in November, was?flagged? in a Boeing Service Letter more than a ten-year-old. The National Transportation Safety Board said that 15 people, including 3 plane crew members, were killed in the fiery crash of the MD-11 cargo aircraft at Louisville Airport.

The NTSB reported that its investigation found fatigue cracks on the left pylon support structure, also known as the bearing race. Boeing's letter from 2011 stated that there were four failures in the bearing race on three aircraft, which required visual inspections. However, it was not considered a safety of flight issue by the NTSB. Boeing's letter stated that the part would be inspected on average every five years.

The FAA declined comment. Boeing stated that it continues to support NTSB's investigation but declined to comment on the letter. ?

The Boeing service bulletin that was cited in this update, according to air safety expert Anthony Brickhouse, flagged "a fatigue situation".

Brickhouse said that if fatigue is not handled properly it could become a safety of flight issue.

In its update, the NTSB also stated that the first engine of the UPS plane had caught fire and there were anomalies in the thrust of the second.

Normaly, a plane with three engines and two working engines can climb.

Experts say that investigators will look at the possibility of ingestion of debris. Reporting by David Shepardson, Washington and Allison Lampert, Montreal

(source: Reuters)