NASA and Space Launch System (SLS) core stage prime contractor Boeing are thoroughly examining a liquid oxygen valve inside the stage’s engine section in order to identify repairs needed before a second hot fire with the Artemis I stage.
During preparations for the second hot fire, data indicated the valve was not opening correctly. Technicians installed platforms that allow engineers to access the valve inside the core stage engine section while the stage remains in the B-2 stand at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. After completion of troubleshooting, which will continue over the weekend, NASA will be in a better position to identify a potential date for the second hot fire test.
This valve, called a pre-valve, must be fully operational during hot fire testing. The valve is part of the core stage main propulsion system, and it helps deliver liquid oxygen propellant flowing from the liquid oxygen tank to an RS-25 engine. For the first hot fire on Jan. 16, all four liquid oxygen pre-valves performed as expected as did all four liquid hydrogen pre-valves.
The Green Run is a comprehensive series of tests for the SLS core stage before it launches the Artemis missions to the Moon, and the hot fire is the final and most intensive test. The Green Run tests have provided invaluable information on how the new rocket stage operates before it is used to launch the Artemis I mission.
Booster stacking continues! The second to last set of segments for NASA’s Space Launch System (SLS) solid rocket boosters were placed on the mobile launcher inside the Vehicle Assembly Building at NASA’s Kennedy Space Center. Engineers with Exploration Ground Systems and Jacobs transported the segments from the Rotation, Processing and Surge Facility, where they have been since June. Once fully stacked, each booster will stand nearly 17 stories tall. The twin boosters will power the first flight of the agency’s new deep space rocket during the Artemis I mission. This uncrewed flight later this year will test the SLS rocket and Orion spacecraft as an integrated system ahead of crewed flights.
The twin boosters will power the first flight of the agency’s new deep space rocket on its first Artemis Program mission. Artemis I will be an uncrewed flight to test the SLS rocket and Orion spacecraft as an integrated system ahead of crewed flights.