“Mottled” Stringers May be STS-133 Resolution

The root cause of the cracked stringers on STS-133′s External Tank (ET-137) may have been found, following the investigation team’s findings that the material used for the tank’s intertank support beams was found to be “mottled”, when compared to standard material. While the work on the 34 stringers is already approved, Thursday’s Program Requirements Control Board (PRCB) will discuss an option to install radius blocks on all 108 remaining stringers, which in turn would slip STS-133 out of the early February launch window.

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