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The final, crucial prelaunch test of NASA’s Artemis I mission to the moon was halted Sunday due to issues that prevented the safe loading of propellants into the mega rocket.
The agency’s next opportunity to begin fueling the 322-foot-tall (98-meter-tall) Artemis I rocket stack, including NASA’s Space Launch System and Orion spacecraft, is on Monday.
“We’ve fixed and we’ve reconfigured from where we were earlier today,” said Charlie Blackwell-Thompson, Artemis launch director, during a press conference Sunday. “Our team has met and has laid out our plan for how we get back to tanking tomorrow, so that is all worked out.”
The team is still troubleshooting the fan issue and is hoping to reach a solution this evening. If that goes according to plan, they will resume tanking the rocket at 7 a.m. ET Monday and begin the countdown around 2:40 p.m. ET.
The test, known as the wet dress rehearsal, began on Friday afternoon at 5 p.m. ET.
The wet dress rehearsal simulates every stage of launch without the rocket actually leaving the launchpad. This includes powering on the SLS rocket and Orion spacecraft, loading supercold propellant into the rocket’s tanks, going through a full countdown simulating launch, resetting the countdown clock and draining the rocket tanks.
Operations were stopped on Sunday before loading propellants into the core stage of the rocket “due to loss of ability to pressurize the mobile launcher,” according to an update shared by the agency.
Prime and redundant supply fans for the mobile launcher weren’t working properly and each encountered different issues, Blackwell-Thompson said.
“The fans are needed to provide positive pressure to the enclosed areas within the mobile launcher and keep out hazardous gases. Technicians are unable to safely proceed with loading the propellants into the rocket’s core stage and interim cryogenic propulsion stage without this capability.”
The fans ensure that gases don’t build up and cause fire hazards or an increase in hazards, Blackwell-Thompson said.
Prior to this issue on Sunday afternoon, Artemis I weathered a powerful thunderstorm at Kennedy Space Center on Saturday.
Four lightning strikes hit the lightning towers within the perimeter of Launchpad 39B. While the first three were low-intensity strikes to tower two, the fourth strike was much more intense and hit tower one.
When these strikes occurred, the Orion spacecraft and SLS rocket core stage were powered up. The rocket’s interim cryogenic propulsion stage and boosters were not.
The fourth strike was fairly rare, because it was a positively charged cloud to ground strike and far stronger than the others, according to NASA’s weather experts.
The fourth lightning strike was “the strongest we have seen since we installed the new lightning protection system,” tweeted Jeremy Parsons, deputy manager of the exploration ground systems program at NASA’s Kennedy Space Center, who has been providing regular updates all weekend. “It hit the catenary wire that runs between the 3 towers. System performed extremely well & kept SLS and Orion safe. Glad we enhanced protection since Shuttle!”
Each of the towers are topped with a fiberglass mast and series of overhead, or catenary, wires and conductors that help divert lightning strikes away from the rocket, Parsons explained. This new system provided more shielding than the one used during the Shuttle program. It also has an array of sensors that can determine the condition of the…