NASA is preparing to roll back the Artemis II rocket and the Orion spacecraft to the Vehicle Assembly Building (VAB) at the Kennedy Space Center in Florida. This decision follows an issue observed on February 21, 2024, regarding an interrupted flow of helium to the interim cryogenic propulsion stage of the Space Launch System (SLS) rocket.
Teams are currently reviewing the situation and making necessary preparations for the rollback. This involves removing access platforms at Launch Pad B, which cannot be taken down during high winds. With adverse weather conditions expected, NASA is taking precautions to ensure that troubleshooting options remain viable both at the launch pad and the VAB.
Helium plays a critical role in maintaining the environmental conditions necessary for the upper stage’s engine. It is also used to pressurize the liquid hydrogen and liquid oxygen propellant tanks. Although the systems functioned correctly during the Artemis II wet dress rehearsals, a failure to achieve proper helium flow occurred after the wet dress rehearsal concluded on February 19, 2024.
As the situation unfolds, operators have implemented a backup method to maintain environmental conditions for the upper stage engines. Fortunately, the rocket remains in a safe configuration while teams investigate the cause of the helium flow interruption. They are examining several potential issues, including connections between ground and rocket lines, a valve in the upper stage, and a filter used in the helium routing system.
The rollback would result in the postponement of the Artemis II launch from its planned window in March. However, the swift actions being taken could still allow for a launch in April, depending on the findings from ongoing data reviews, repair efforts, and schedule adjustments in the coming days and weeks.
NASA has emphasized its commitment to addressing the issue promptly to ensure the success of the Artemis II mission, which aims to further human exploration of the Moon. The crew for this mission includes NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, alongside Jeremy Hansen from the Canadian Space Agency.
As preparations continue, NASA remains focused on ensuring that all systems are thoroughly checked and operational for the ambitious goals of the Artemis program. The agency will keep the public informed as more information becomes available and the situation progresses.
