Spaceflight Now January 16, 2021 Stephen Clark
Live coverage: SLS core stage engines shut down early during critical hotfire test
"We got lots of data that we're going to go through … get to a point where we can make a determination as to whether or not launching (the Artemis 1 mission) in 2021 is a possibility or not,†says NASA Administrator Jim Bridenstine.
Based on an analysis of the video and audio aired on NASA TV, the first sign of trouble during the abbreviated SLS hot fire test came about 50 seconds after engine ignition, when an engineer on the test team declared an "MCF" or a "Major Component Failure" on Engine No. 4.
"Copy that, but we're still running -- we've still got four good engines right?" the test conductor replied.
"Copy that," a member of the test team said.
At about T+plus 1 minute, 7 seconds, video showed at least one of the core stage engines appearing to be in a shutdown sequence. Seconds later, an engineer mentioned "violations" on the test communications loop, followed by verbal confirmation of engine shutdown from the test conductor at T+plus 1 minute, 22 seconds.
The SLS core stage engines shut down a little more than a minute into the planned eight-minute firing.
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