Aresearch.112 net.columbia utzoo!decvax!ucbvax!mhtsa!research!sjb Thu Oct 29 23:31:38 1981 shuttle info Pad 39A was cleared of all but essential workers today in preparation for the countdown -- scheduled to begin at 0100 EDT on Saturday. Explosives were installed -- some to break holding bolts on the pad; others to be detonated by the range safety officer (with the possibility of escape by the astronauts) if the shuttle veers towards a populated area. The shuttle will once again land at Rogers Dry Lake at Edwards Air Force Base with a 15,000 foot strip at Cape Canaveral in sight for the fourth and final test flight.