The second launch of Space Shuttle Columbia gets an unexpected one-month delay when a fuel leak forces NASA to remove, clean and re-attach 300 thermal tiles. The work can be done on-site, so Columbia simply stays on the pad. The second launch will be the last for the white external fuel tank, since NASA has determined that its brown insulating foam layer will cause no problems if left exposed; leaving off the coat of white paint saves several hundred pounds.
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