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Two cracks in Discovery's external tank can be repaired at launch pad 39A, NASA officials say.
"This is something we've seen before, something we've repaired before," said Kyle Herring, a shuttle program spokesman at Johnson Space Center in Houston.
The cracks, each about nine inches long, were found near the top of one of the composite aluminum strips called "stringers" that run up and down the tank's ridged intertank.