A bleed issue in one of the four RS-25 rocket engines scrubbed Monday’s debut launch of the Space Launch System and Orion spacecraft.
should be chilled to minus 420 degrees Fahrenheit and engine 3 was about 30 to 40 degrees from hitting that mark. Engines 1, 2 and 4 were at minutes 410, so technically, none of the engines were at temperature.
"What you want to do in a rocket engine system that uses hydrogen as a fuel and oxygen as an oxidizer is you want to need to establish a way to make sure you chill down the engines," Honeycutt said. "The way we do that is we send liquid hydrogen out of the hydrogen tank to each individual engine. It has its own bleed system, which is used to take the heat out of the engine as we chill it down.
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