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Hydraulic system issue triggered early engine shutdown during SLS test-firing – Spaceflight Now

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An exhaust plume erupts from the B-2 test stand during a test-firing of the Space Launch System core stage Jan. 16. Credit: NASA/Robert Markowitz
NASA officials said Tuesday the weekend test-firing of the Space Launch System moon rocket’s core stage was cut short by an out-of-limits parameter in a hydraulic system for gimbaling, or vectoring, one of its engines. ....

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NASA SLS rocket is in 'excellent condition' after weekend's hot fire test abort

| UPDATED: 15:13, Wed, Jan 20, 2021
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NASA S SLS or Space Launch System has been stuck in development hell since 2011. Touted as the most powerful launch vehicle built since the Saturn V that carried Apollo astronauts to the Moon, SLS was meant to fly for the first time three years ago. But the £12.5billion ($17billion) project is only now edging closer to completion and will serve NASA s new Moon landing programme, Artemis. ....

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A critical test of NASA's moon rocket ended abruptly on Saturday, possibly dashing hopes of launching in 2021

A critical test of NASA s moon rocket ended abruptly on Saturday, possibly dashing hopes of launching in 2021
mmcfalljohnsen@businessinsider.com (Morgan McFall-Johnsen)
© NASA TV
An SLS engine burns propellant (left), then abruptly shuts down (right) during a hot fire test on January 16, 2021. NASA TV
The test automatically ended due to an issue with an engine s hydraulic system, NASA said Tuesday.
The rocket was scheduled to launch in November 2021 and kick off the agency s Artemis moon-landing program, but the new issue could delay that launch and the return of humans to the lunar surface for the first time since 1972.
NASA s mega-sized moon rocket hit a snag during a critical test on Saturday, and the error could further delay the agency s effort to send astronauts back to the moon. ....

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SLS Core Stage Green Run WDR countdown ends early - NASASpaceFlight.com

December 23, 2020
NASA partially completed the Green Run Wet Dress Rehearsal (WDR) test of the Space Launch System (SLS) Core Stage on the second attempt in the B-2 Test Stand at the Stennis Space Center. The test was again conducted in secrecy on 20 December, and the test team was able to fill the rocket stage with its liquid oxygen (LOX) and liquid hydrogen (LH2) propellants for the first time ever; however, a crucial, 10-minute long terminal countdown was aborted inside of the 5 minute mark when a valve failed to close within pre-set time limits.
In a statement, NASA said that despite the early end to the test the issue doesn’t appear to be with the vehicle; after draining the stage, the agency’s SLS Program and Core Stage prime contractor Boeing are now reviewing data from the test and inspecting the stage after its first propellant loading cycle while they deliberate what to do next. The 8-minute long Hot-Fire test was expected about two weeks after a fully comple ....

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