Test engineers at NASA’s Stennis Space Center have kicked off testing of surplus Space Shuttle Main Engines (SSMEs) for use in the heavy-lift Space Launch System (SLS), firing one of two ground-test engines left over from the shuttle program in the A-1 test stand where the engine first was tested almost 40 years ago. Primary objectives of the 500-sec. hot-fire test on Jan. 9 – the first time an RS-25 SSME has fired since the STS-135 flight of Atlantis in 2011 – were to ...

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