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One of the dual digital computer units (DCU) in the engine controller for the number four RS-25, Engine 2060, stopped responding beginning on November 23. All four controllers were being powered up for Program Specific Engineering Testing (PSET) on the SLS Core Stage, which is stacked with the full Artemis 1 vehicle in High Bay 3 of the Vehicle Assembly Building (VAB) at the Kennedy Space Center (KSC) in Florida. The dual channels on all four controller units powered up successfully on November 12 during other checkout testing prior to the failure on the 23rd. The engine controller units (ECU)...

Shuttle's robot arm struck during repair work BY WILLIAM HARWOOD STORY WRITTEN FOR CBS NEWS "SPACE PLACE" Posted: November 12, 2002 Engineers installing an access platform in the shuttle Endeavour's cargo bay for work to repair an oxygen leak inadvertently hit the ship's 50-foot-long robot arm today, tearing the fragile space crane's protective thermal insulation. Whether any other, possibly more serious, damage occurred is not yet known. The issue will be discussed at a management review Wednesday. Endeavour's countdown to an early Monday launch was called off Sunday night when engineers discovered one of two systems that feed oxygen...