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at nasa's kennedy space center in

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florida technicians at launch pad 39a

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are working to repair small cracks on

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the tops of two metal support beams

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called stringers on space shuttle

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discovery's external fuel tank

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teams have removed 13 inches of metal

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from the tops of the two stringers and

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installed new sections of metal called a

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doubler in the cracked metal's place as

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part of the repair method

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it's called a doubler because it's twice

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as thick as the original stringer metal

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video b-roll includes lipstick camera

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views from inside an environmental

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enclosure where the repair work is

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taking place on the outside of the

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external tank

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the enclosure will provide the proper

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temperature and humidity when foam

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insulation is reapplied to the tops of

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the stringers following the repairs

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the stringer cracks developed as the

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external tank was being filled for

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discovery's launch attempt on november

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5th for its

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sts-133 mission to the international

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space station

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that launch attempt was scrubbed because