NASA Rolls Back Artemis 2 Rocket From Launch Pad Amid Helium Issue
KENNEDY SPACE CENTER, Fla. (AP) — NASA will move its Artemis 2 moon rocket and spacecraft from Launch Pad 39B back to the Vehicle Assembly Building on Feb. 25, 2026, after discovering a helium flow problem in the rocket's upper stage, officials said. The four-mile journey starts Wednesday and could last up to 12 hours, delaying the launch from no earlier than March 6 to no earlier than April 1.
The issue surfaced after a successful prelaunch fueling test, NASA reported. Teams identified the helium flow anomaly in the upper stage, requiring troubleshooting inside the assembly building. Cold temperatures and high winds delayed the original Feb. 24 target by one day.
The Space Launch System rocket, topped with the Orion spacecraft, arrived at the pad on Jan. 17 after a 12-hour rollout from the Vehicle Assembly Building. NASA conducted a wet dress rehearsal, a full propellant loading simulation, which succeeded except for the helium problem. Officials called the test otherwise effective in validating systems.
"Cold temperatures and high winds are expected Tuesday, and rolling on Feb. 25 gives teams enough time to complete preparations at the launch pad that were limited today by high winds in the area," NASA officials stated in a Feb. 23 update reported by Space.com.
The rollback uses Crawler Transporter 2, which carries the 322-foot-tall stack at speeds up to 1 mph. NASA expects the process to take 10 to 12 hours, depending on conditions. Once in the Vehicle Assembly Building, engineers will inspect and repair the helium pressurization system in the Interim Cryogenic Propulsion Stage.
Artemis 2 is the first crewed flight of the SLS and Orion systems. Four astronauts — Reid Wiseman, Victor Glover, Christina Koch and Jeremy Hansen — will conduct a 10-day lunar flyby mission. The crew entered quarantine for the original March window, according to NASA blogs, though their status after the delay remains unconfirmed.
The mission follows the uncrewed Artemis 1 launch in November 2022. Artemis 2 tests human operations in deep space, paving the way for Artemis 3, which aims for a lunar landing no earlier than 2027. NASA has not specified a repair timeline or confirmed an April launch target.
Sources including NASA.gov and Florida Today described the helium issue as targeted, not indicative of broader failures. "The problem was discovered after an otherwise successful prelaunch fueling test of the Space Launch System rocket," said Eric Lagatta in a Florida Today article.
The stack spent more than a month at the pad. Rollbacks are routine in NASA's history, dating to Apollo-era operations at Kennedy Space Center. The SLS program, led by NASA with Boeing building the core stage and Lockheed Martin the Orion spacecraft, has faced technical challenges since Artemis 1.
Live coverage of the rollback is available through NASA streams and Space.com. NASA officials emphasized safety and reliability in updates. The mission aligns with broader U.S. goals for lunar exploration and future Mars missions.
Artemis 2 represents the first U.S. crewed lunar mission since Apollo 17 in 1972. The program underscores ongoing efforts in space policy, including comparisons to commercial systems like SpaceX's Starship for later Artemis phases.
No cost implications from the delay were detailed in NASA statements. The helium fix targets a specific component, according to credible sources, avoiding major redesigns.
The upper stage uses helium for pressurization during flight. Details on the exact nature of the flow issue, such as a potential valve or sensor problem, were not released.
The mission's crew includes NASA's first woman and first person of color assigned to lunar flight. They will not land on the moon but orbit it.
Artemis 2 validates systems for sustained human presence beyond low Earth orbit. Delays highlight complexities in large-scale rocketry, according to program updates.
The new April 1 date serves as the earliest possible, pending fixes. NASA has not committed to a specific window.
