Aalice.137 net.columbia utzoo!decvax!ucbvax!ihnss!houxf!harpo!research!alice!sjb Thu Nov 5 21:43:10 1981 shuttle scrub Joe Engle and Richard Truly returned to Johnson Space Center in Houston to undergo more simulator experience before a seconds try at the second launch of the shuttle is attempted. Today, inspection of the APU filter units began -- it should take about 2 days. If the decision (expected Saturday) is to simply ``flush and fill'' them, the earliest a new launch could take place would be next Wednesday; if the units are to be replaced, it will probably occur the next week. New units would require 32 hours to install plus additional time to test. Also today, hydrogen and oxygen fuel in the Columbia's external tank was unloaded and stored.