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RS-25 test in new series. NASA photo
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STENNIS SPACE CENTER, Miss. - NASA conducted a full-duration test Dec. 15 to begin a new series of testing for state-of-the-art RS-25 engines to help power the agency's Space Launch System (SLS), America's new deep-space rocket. The first hot fire of the new series was conducted for 500 seconds on the Fred Haise Test Stand (formerly A-1 Test Stand). The test schedule is divided into three phases: An initial five tests scheduled into next spring will use development engine No. 0525 to gather data on a variety of new engine components manufactured with state-of-the-art fabrication techniques, like hot isostatic pressure bonding and selective laser melting. A second phase of 12 tests will begin next summer with a certification engine produced with all new parts in Aerojet Rocketdyne’s factory in DeSoto, Calif. It is identical to new engines being manufactured for flights after Artemis IV. A third phase of 12 tests will be conducted with the development engine, which will have many of the same parts as the certification engine and also will be used to certify the new engines for flight. This latest round of testing is part of a program to develop new RS-25 engines and components for future Artemis deep space missions. During each phase, engineers are introducing newly fabricated components on developmental engines. The components tested in this series include newly fabricated turbopumps, ducting, harnesses, and valves. Also included will be a previously tested pogo accumulator. RS-25 tests at Stennis are conducted by a team of NASA, Aerojet Rocketdyne and Syncom Space Services operators. Syncom Space Services is the prime contractor for Stennis facilities and operations. (Source:
NASA, 12/15/21)
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