WASHINGTON - NASA is ready to head to a wet dress rehearsal (WDR) countdown of the Space Launch System (SLS) from April 1-4 that will serve as the final key before its first launch to the moon. The event can be streamed online at NASA's website. In the rehearsal, the rocket is filled with liquid hydrogen and liquid oxygen propellant and the countdown is taken to just under T-10 seconds, shortly before the core stage’s four RS-25 engines would ignite. The WDR will test fueling and countdown procedures ahead of the Artemis 1 launch this summer. The test will begin around 4 p.m. CDT. If the test goes forward as planned, NASA expects to know quickly how the vehicle performed and how soon it would be ready for launch. NASA plans to hold a briefing April 4 with a first review of the results of the WDR. (Source: Space News 03/29/22) Gulf Coast Note: RS-25 tests were conducted by a combined team of NASA, Aerojet Rocketdyne and Syncom Space Services operators at the Stennis Space Center, Miss. Syncom Space Services is the prime contractor for Stennis facilities and operations.
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