Aresearch.89 net.columbia utzoo!decvax!duke!chico!harpo!research!sjb Mon Oct 12 17:57:38 1981 more valves A leak of nitrogen tetroxide fumes from another faulty valve on Saturday caused a 45 minute delay in the filtering process of the propellant. Workers were evacuated from pad 39A, but no one was hurt. Officials say that some time was lost, but it will not delay the scheduled 4 November launch of the orbiter.