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NASA ID: SSC_2022-12-14_RS-25_Engine_Test NASA conducted the first test of the new RS-25 restart engine campaign for future flights of the Space Launch System (SLS) rocket Dec. 14, completing 209.5 seconds of a scheduled full-duration hot fire at Stennis Space Center near Bay St. Louis, Mississippi. The single-engine hot fire, known as a confidence test, was designed to confirm all is ready to proceed with a series of certification tests early next year on a full RS-25 certification engine. NASA and the company modified 16 of the engines remaining after the Space Shuttle Program for use on Artemis mission I through IV. The upcoming series of testing is for the RS-25 engines that will be used beginning with Artemis V.