![]() The countdown resumed at T-10 minutes at about 7:30 pm Eastern (23:30 UTC), to begin a single terminal countdown run which was consolidated from two planned terminal countdown runs conducted by the Ground Launch Sequencer (GLS). For June 20, the simulated launch day for this attempt, the Mission Management Team (MMT) held their pre-tanking briefing early in the morning with a targeted, initial T-0 of 2:40 pm Eastern (18:40 UTC). The countdown timeline was again aligned to the same time of day as the first three attempts. SLS stages fueled again for terminal countdown demonstration test If enough test objectives were completed to NASA’s satisfaction, the agency may soon have the data it needs to finally set an official launch date currently, late August is the earliest that Artemis 1 could lift off. The fourth Wet Dress Rehearsal (WDR) test attempt got down to T-29 seconds in a single, consolidated run of the countdown’s final ten minutes with the integrated Orion spacecraft and Space Launch System (SLS) rocket for Artemis 1 fully fueled and pressurized like it will be for launch.Ī different set of gaseous nitrogen supply and hydrogen leak issues pushed the final countdown to the end of a long day for launch team members with the agency’s Exploration Ground Systems (EGS) program and prime launch processing contractor Jacobs, but they were able to fully fuel the two cryogenic stages on the SLS launch vehicle with liquid oxygen (LOX) and liquid hydrogen (LH2) and count down to the final handover of countdown control to the SLS flight computers. NASA got within several seconds of completing its practice launch day exercise June 20 with the Artemis 1 vehicle on the launch pad at the Kennedy Space Center (KSC) in Florida.
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