From: utzoo!decvax!harpo!npois!alice!sjb Newsgroups: net.columbia Title: Columbia Turned On Article-I.D.: alice.689 Posted: Mon Jun 21 17:57:43 1982 Received: Thu Jun 24 02:22:41 1982 The Columbia's electrical systems were turned on today in the final preparations for tomorrow's countdown commencement. Also today, crews installed a backup computer that will take over should any of the five main computers fail; other crews inspected the three main engines and the two SRB's. The countdown is scheduled to begin at T-90 hours (with about a day's worth of holds built in) tomorrow at 1700 EDT aiming for a 1100 EDT launch on Sunday.