NASA

NASA Stennis Continues Prep for Future Artemis Testing

Crews at NASA’s Stennis Space Center recently completed activation of interstage gas systems needed for testing a new SLS (Space Launch System) rocket stage to fly on future Artemis missions to the Moon and beyond. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the […]

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Apr 23, 2025 - 22:00

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NASA Stennis Continues Prep for Future Artemis Testing

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Preparations for Next Moonwalk Simulations Underway (and Underwater)

Syncom Space Services employees Kenneth Shipman, left, and Jesse Yarbrough perform final tubing install on the Thad Cochran Test Stand — Syncom Space Services employees Kenneth Shipman, left, and Jesse Yarbrough perform final tubing install in early March to prepare the interstage simulator gas system on the Thad Cochran Test Stand at NASA’s Stennis Space Center for leak checks. Leak checks were performed prior to activation of the gas system this month. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.
NASA/Danny Nowlin

Syncom Space Services employees Branson Cuevas, left, Kenneth Shipman, and Jesse Yarbrough install final tubing before activation of the interstage simulator gas systems on the Thad Cochran Test Stand — Syncom Space Services employees Branson Cuevas, left, Kenneth Shipman, and Jesse Yarbrough install final tubing in early March before activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.
NASA/Danny Nowlin

Crews at NASA’s Stennis Space Center recently completed activation of interstage gas systems needed for testing a new SLS (Space Launch System) rocket stage to fly on future Artemis missions to the Moon and beyond.

The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand. For Green Run, teams will activate and test all systems to ensure the stage is ready to fly. Green Run will culminate with a hot fire of the stage’s four RL10 engines, just as during an actual mission.

The interstage simulator component will function like the SLS interstage section that protects the upper stage during Artemis launches. The interstage simulator will do the same during Green Run testing of the stage at NASA Stennis.

The interstage simulator gas system will provide helium, nitrogen, and hydrogen to the four RL10 engines for all wet dress and hot fire exercises and tests.

During the activation process, NASA Stennis crews simulated the engines and flowed gases to mirror various conditions and collect data on pressures and temperatures. NASA Stennis teams conducted 80 different flow cases, calculating such items as flow rates, system pressure drop, and fill/vent times. The calculated parameters then were compared to models and analytics to certify the gas system meets performance requirements.

NASA engineers Chad Tournillon, left, and Robert Smith verify the functionality of a control system — NASA engineers Chad Tournillon, left, and Robert Smith verify the functionality of the control system in early March for activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.
NASA/Danny Nowlin

several members of the engineering and operations team are shown seated and reviewing data — Members of the engineering and operations team review data as it is collected in early March during activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. Pictured are NASA’s Mark Robinson, Robert Simmers, Jack Conley, and Nick Nugent. Activation of the gas systems marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.
NASA/Danny Nowlin

two NASA engineers seated at workstation monitoring data during the activation of the interstage simulator gas systems — NASA engineers Pablo Gomez, left, and B.T. Wigley collect data in early March during activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the NASA Stennis stand.
NASA/Danny Nowlin

Syncom Space Services employees stand together reviewing paperwork — Syncom Space Services employees Brandon Fleming, Robert Sheaffer, and Logan Upton review paperwork in early March prior to activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.
NASA/Danny Nowlin

Syncom Space Services engineering tech Brandon Fleming tightens a pressure transducer on the Thad Cochran Test Stand at NASA’s Stennis Space Center in early March. Various transducers were used to provide data during subsequent activation of the interstage simulator gas systems at the stand. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.
NASA/Danny Nowlin

Crews now will work to activate the umbilical gases and liquid oxygen systems. The NASA Stennis team will then conduct water system activation, where it will flow the flame deflector, aspirator, diffuser cooling circuits, purge rings and water-cooled fairing.

Afterward, the team will deploy the FireX system to check for total coverage, expected to be completed in the summer.

Before the exploration upper stage, built by Boeing at NASA’s Michoud Assembly Facility in New Orleans, arrives at NASA Stennis, crews will perform a final 24-hour check, or stress test, across all test complex facilities to demonstrate readiness for the test series.