NASA’s Space Launch System (SLS) Program rescheduled the final two tests that will culminate the Core Stage Green Run campaign for December after successfully repairing one of the liquid hydrogen (LH2) prevalves inside the engine section of the stage.
The Wet Dress Rehearsal is now targeted for the week of December 7, and if that goes well the Hot-Fire test of the stage could occur two weeks later during the week of December 21.
Prevalve repaired in tight confines of engine section
The Artemis 1 core stage flight article is installed in the B-2 Test Stand at the Stennis Space Center in Southern Mississippi for the Green Run design verification campaign.
An intermittent failure of the LH2 prevalve for engine four was discovered during previous Green Run testing and after troubleshooting and partial disassembly, analysis narrowed the problem down to a clutch mechanism on the valve. Following the surgical clutch replacement, the fully-reconstructed valve assembly passed retesting and Core Stage prime contractor Boeing is now working to pick up preparations for the first of the two final critical tests: a Wet Dress Rehearsal (WDR) to prepare for a subsequent full-duration test firing of the stage.
NASA reported on November 18 ...