The mission lasted 6 days, 00 hours, 56 minutes, 04 seconds, with landing taking place on Runway 17 at Edwards Air Force Base at 6:37 a.m. PDT on 5 September 1984. During STS-41-D, "Discovery" traveled a total of and made 97 orbits. The orbiter was transported back to KSC on 10 September 1984. Ominously, STS-41-D was the first Shuttle mission in which blow-by damage to the SRB O-rings was discovered, with a small amount of soot found beyond the primary O-ring. Following the Challenger tragedy, Morton Thiokol engineer Brian Russell called this finding the first "big red flag" on SRB Joint and O-ring safety.