NASA engineers have found a third crack in space shuttle Discovery's external tank. The discovery of two cracks delayed the slated early November launch. NASA is not yet saying the scheduled November 30 liftoff is in jeopardy.
To meet that date, however, the cracks will have to be repaired while Discovery sits on the pad. That has never been done before. It seems a little late in the shuttle program to be trying new procedures, especially those related to launch safety, but, so far, NASA seems convinced it can make the repairs and meet the next launch window.
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