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NASA testing RS-25 engines for Artemis missions

BAY ST. LOUIS, Miss. — With Artemis I in the books, NASA is back at the test stands.

The space agency said it will begin a series of hot fire testing Wednesday for the RS-25 engines at the Stennis Space Center.

The engines, built by Aerojet Rocketdyne, will help power the Space Launch System rocket on Artemis missions.

The test is expected to run for 500 seconds and will be livestreamed on NASA Stennis Space Center Facebook and YouTube pages. The test window is set to open at 2 p.m. CST.

The initial single-engine hot fire, known as a confidence test, is designed to confirm all is ready to proceed with a series of certification tests early next year on a full RS-25 certification engine.

“It is exciting to return to hot fire testing at the historic Fred Haise Test Stand and get back to the business of testing for future Artemis missions,” said NASA Stennis RS-25 project manager Chip Ellis.

The test will provide initial data to aid NASA and lead SLS engines contractor Aerojet Rocketdyne as the company prepares to begin production of new RS-25 engines for Artemis missions to the moon and Mars.

For each SLS flight, four RS-25 engines, along with a pair of solid rocket boosters and core stage, help power the rocket at liftoff. NASA and Aerojet Rocketdyne 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.

“We’re looking forward to this upcoming hot fire test to verify our design but also to ensure we have the most robust engine possible,” said Andy Ketchum, Aerojet Rocketdyne’s RS-25 test and flight operations manager. “The … engine test is focused on evaluating how components like the new powerhead, low-pressure oxidizer, and fuel turbopumps perform together before we add the new nozzle and controller into the mix.”

The end-of-year hot fire marks a return to RS-25 testing at Stennis since NASA completed its developmental test effort in March. Developmental work included several test series to collect data for Aerojet Rocketdyne as the company modernizes manufacturing processes and reduces production costs of new RS-25 engines.

Wednesday’s test also follows multiple upgrades made in recent months to the Fred Haise Test Stand. The projects included installation of new test stand piping, drilling a special flame bucket hole pattern to help cool RS-25 engine exhaust, and updating the stands thrust vector control and data acquisition systems.

Every RS-25 engine that will help power the SLS rocket at launch for Artemis missions will be tested at Stennis.

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