![]() ![]() “We don’t launch until it’s right,” NASA Administrator Bill Nelson said in remarks on NASA TV about half an hour after the scrub. Thunderstorms in the vicinity of the launch site kept tanking from starting for about an hour until weather conditions improved. NASA first ran into challenges with the launch shortly after managers gave their approval to load the rocket with liquid hydrogen and liquid oxygen propellants nearly nine hours before the scheduled liftoff. After more than an hour, NASA scrubbed the launch but planned to collect additional data before unloading the liquid hydrogen and oxygen propellants from the core and upper stages. NASA then called for an unplanned hold at T-40 minutes, originally scheduled to last 10 minutes, to work on a troubleshooting plan for the engine. They took several measures to try to increase that flow, including shutting off the flow in the other three engines to increase the pressure for engine #3, without success. The hydrogen kickstart worked on three of the four engines, but on the fourth, designated engine #3, controllers did not see the flow of liquid hydrogen they expected. That system was not tested in the final wet dress rehearsal in June because of a leak in a quick-disconnect fitting, and was something project officials said they would test earlier than planned in the launch countdown. NASA encountered an issue with the “hydrogen kickstart” of the four RS-25 engines, where liquid hydrogen is flowed through the engines for thermal conditioning ahead of launch. Eastern liftoff after spending more than two and a half hours attempting to resolve a problem flowing liquid hydrogen into one of four main engines in the rocket’s core stage to prepare them for the planned launch. NASA called off the launch shortly after the scheduled 8:33 a.m. 29 after a problem with a hydrogen bleed line with one of the rocket’s four core stage engines. ![]() NASA scrubbed the first attempt to launch its Space Launch System rocket and Orion spacecraft Aug. ![]()
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