Engineers will try to complete a practice countdown and fueling test Monday for NASA's huge Artemis moon rocket.
NASA called off plans to load its new Space Launch System moon rocket with more than 750,000 gallons of liquid oxygen and hydrogen fuel Sunday because of trouble with launch pad support equipment need to prevent buildups of hazardous gas. The team plans to try again Monday.
The countdown started Friday afternoon and reached the T-minus 6-hour point early Sunday when engineers had planned to begin pumping 196,000 gallons liquid oxygen and 537,000 gallons of liquid hydrogen into the rocket's core stage. Another 22,000 gallons of cryogenic oxygen and hydrogen fuel was to be loaded into its upper stage.
But the countdown was held up, first to give engineers time to get back on schedule after delays caused by stormy weekend weather and then by trouble with fans used to pressurize the rocket's mobile launch platform. The fans ensure positive pressure inside the structure to prevent the buildup of any free hydrogen during the fueling operation.
"Fans are needed to provide positive pressure to the enclosed areas within the mobile launcher keep out hazardous gases," NASA said in a blog post."Technicians are unable to safely proceed with loading the propellants into the rocket's core stage and stage without this capability."
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