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L-0: H20 line broke lots of ice on facility. Concern: damage to TPS on launch. Discussion w/ RI - no Thiokol concern - decision to go, but send out ice team at T-20. (ice team takes IR measurements & some photos) • what are flt rules, LCC involving low temperature? Do we have any constraints on having an orbiter on the pad in low T? Lovingood - MSFC: SRB's - steel case. Went to lt wt on STS-6 (cases ~6% thinner) designed for use with high performance motors on STS-8. Filament wound are graphite epoxy, design for 1st VBG flight (may not be reusable) → "field joints" - stacking at KSC [jnt of interest] "factory joints" - pouring at Thiokol