UPDATE 1-Orbital says report on October rocket explosion nearly done

The October 28 explosion of an Orbital ATK Inc Antares rocket bound for the International Space Station was most likely caused by excessive wear of the bearings inside one of the rocket's GenCorp Inc engines, Orbital said on Tuesday, citing a nearly finished report. Ronald Grabe, Orbital's executive vice president and president of its flight systems group, told the annual Space Symposium conference the company would submit its final report in coming days to the Federal Aviation Administration, which has been overseeing the company-led accident investigation board.

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