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From what I just read, the Centaur valve problem is a known issue with the design. For satellite launches, they just order it to cycle and it stops chattering. Since this is the first ever crewed launch on an Atlas/Centaur, they did not want to cycle the valve with the crew on board.
"You'd rather be on the ground wishing you were in space than in space and wishing you were on the ground." - Butch Wilmore, NASA/Boeing astronaut
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Currently BMW-less.  |