Live coverage of NASA’s Space Launch System (SLS) Flight Support Booster-1 (FSB-1) ground test has begun on NASA Television and the agency’s website. The test fire is scheduled to begin at 3:05 EDT. Systems checks are underway for the full-scale, five-segment solid rocket booster ground test at Northrop Grumman’s test facility on Promontory, Utah. This is the first in a series of tests that are examining motor performance for potential new materials and processes that may be incorporated in the booster after the Artemis III lunar mission.