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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