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Artemis 1 SLS stacking work running long, preps for integrated tests continue in parallel

Artemis 1 SLS stacking work running long, preps for integrated tests continue in parallel
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Aerojet Rocketdyne refurbishing RS-25 engines for Artemis 1 launch and production restart testing

Aerojet Rocketdyne refurbishing RS-25 engines for Artemis 1 launch and production restart testing
April 9, 2021
With the completion of another single-engine RS-25 development test, Aerojet Rocketdyne is now refurbishing five engines at the Stennis Space Center in Mississippi for their next use. After the second test firing of the Retrofit 2 series in the A-1 Test Stand on April 6, development engine 0528 is going through a streamlined refurbishment prior to its next firing as a part of the production restart Retrofit 2 test series.
In parallel, the four RS-25 engines installed on the first Space Launch System (SLS) Core Stage in the nearby B Test Stand are being taken through a longer refurbishment checklist for flight engine hardware. The next planned ignition for those Core Stage engines is for the first SLS launch on the Artemis 1 mission to send an Orion spacecraft to lunar orbit. ....

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Second prevalve issue delays completion of SLS Core Stage Green Run campaign

Second prevalve issue delays completion of SLS Core Stage Green Run campaign
February 26, 2021
A problem with another one of the eight prevalves in the Artemis 1 Core Stage for NASA’s Space Launch System (SLS) has postponed a second test-firing to wrap up the Green Run campaign. The SLS Program’s first flight article has been installed in the B-2 Test Stand at the Stennis Space Center in southern Mississippi since January 2020.
After a liquid hydrogen prevalve was repaired in November, all the prevalves worked during tanking and firing tests until final preparations for a second Hot-Fire when a liquid oxygen prevalve stopped opening correctly. Engineers are back inside the stage’s engine section to troubleshoot the failure and determine what needs to be fixed; currently, NASA doesn’t expect to be ready to test-fire the stage again until mid-March. ....

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