Artemis 1 won't fly today after all.
"Launch controllers condition the engines by increasing pressure on the core stage tanks to bleed some of the cryogenic propellant to the engines to get them to the proper temperature range to start them," NASA officials said in a
The Engine No. 3 conditioning issue cropped up as NASA worked through a series of glitches during the countdown, including a liquid hydrogen leak early in the fueling process and a possible crack in a part of core booster known as the intertank flange, which connects the SLS's giant liquid hydrogen and liquid oxygen tanks. The tanks can hold a combined 730,000 gallons of propellant.
NASA engineers found that the crack was actually in the insulating foam on the flange, not in the rocket's metal structure."That ice that formed is essentially air that's being chilled by the tank that gets trapped inside of a crack in the foam but not the actual tank," Nail said. The Engine No. 3 problems and the feared crack followed concerns about a liquid hydrogen leak in the rocket.
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