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High Quality Content by WIKIPEDIA articles! STS-43, the ninth mission for Space Shuttle Atlantis, was a nine-day mission whose primary goal was launching the fourth Tracking and Data Relay Satellite, TDRS-E. The launch took place on August 2, 1991, 11:01:59 a.m. EDT. Launch was originally set for July 23 but was moved to July 24 to allow time to replace a faulty integrated electronics assembly that controls orbiter/external tank separation. Mission postponed again about five hours before liftoff on July 24 due to a faulty main engine controller on number three main engine. Controller replaced and retested; launch reset for August 1. Liftoff set for 11:01 a.m. delayed due to cabin pressure vent valve reading and postponed at 12:28 p.m. due to unacceptable return-to-launch site weather conditions. Launch reset for August 2. Launch weight: 259,374 lb (117,650 kg).