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• black smoke: NBR & putty is location of blow-by...NBR burns black. • why 60 sec, not 7-10 sec to burn through? • alignment pin holes.... a candidate for exit....(heat loss: longer t?) • 17 tests to determine t to burn-thru • pressure check, if it leaks, may blow hole into putty possible fixes: • capture devices • new putty • larger O-rings • teflon ring (like spacer on extruder) • SRB -> ET move not considered too probable by MSFC as cause of explosion — not result. • SSME inlet P starting see 2 shutdown ends after explosion