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• 25° T O-rings on 51L! (53° T = lowest previous launch case T) • 31° T + 5° sky is [underline]only[/underline] LCC • MSFC runs 24 hr thermal model - gets T at areas in SRB system... but [underline]not[underline] run during countdown • "compression set" (o-ring doesn't bounce back) • 51 L pressure check: [underline]no drop[underline] request: search for internal memos on T operation of 0-rings * leak port in "same area" as black puff + flame (another trail) crack in case = another trail * fax material to/from Thiokol on T concern O-ring people expressed concern. Telecom (MSFC, Thiokol, KSC) Thiokol rec. not launch below 53° o-ring. [[margin note]] projected T ≈ 29° Then