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[b]Engineers troubleshooting engine cooling issue[/b] Engineers are troubleshooting an issue conditioning one of the four RS-25 engines (engine no. 3) on the bottom of the Space Launch System (SLS) core stage. Launch controllers condition the engines by increasing pressure on the core stage tanks to bleed some of the cryogenic propellant (liquid hydrogen) to the engines to get them to the proper temperature range needed to start them. Engine no. 3 is not properly being conditioned through the bleed process. At T-40 minutes, an unplanned hold was called to give the engineers time to troubleshoot the issue.
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