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NASA has initialized plans via a letter contract with Northrop Grumman for 12 additional Solid Rocket Boosters, or SRBs, for the agency’s Space Launch System (SLS) rocket — a pending contract with a potential value of $49.5 million USD

In the letter contract, the agency will “provide initial funding and authorization” to Northrop Grumman to begin ordering components, including long-lead items, for the 12 additional SRBs that will support Artemis 4 through Artemis 9

The 12 additional SRBs will provide NASA with enough boosters for six additional SLS missions, including Artemis 4 through Artemis 9.  Previously, NASA had only contracted Northrop Grumman for six SRBs, which will fly on Artemis 1 through Artemis 3

“This initial step ensures that NASA can build the boosters needed for future Space Launch System rockets that will be needed for the Artemis missions to explore the Moon,” said John Honeycutt, SLS Program Manager at NASA’s Marshall Space Flight Center

Northrop Grumman recently delivered the 10 propellant segments for both of the Artemis 1 SRBs to NASA’s Kennedy Space Center

All construction and testing of the SRBs by Northrop Grumman is done at their facility in Promontory, Utah