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From: mmm@cup.portal.com (Mark Robert Thorson)
Newsgroups: sci.space.shuttle
Subject: External Tank Temperature Cycling
Message-ID: <18007@cup.portal.com>
Date: 6 May 89 00:32:17 GMT
Organization: The Portal System (TM)
Lines: 6

How many times can the external tank be cycled down to cryogenic
temperatures, then brought back up, such as occurred during the
first attempt to launch the Atlantis?

It seems to me that a fiberglass tank designed for one-shot use would
not be able to withstand too many cycles.