NASA Rolls Back Artemis II Rocket for Repairs After Helium Malfunction
KENNEDY SPACE CENTER, Fla. (AP) — NASA rolled back its Artemis II moon rocket from the launch pad Wednesday to fix a helium system malfunction, delaying the crewed lunar flyby mission. The agency began the process at 9:38 a.m. EST from Launch Complex 39B at Kennedy Space Center, using an Apollo-era crawler-transporter to move the Space Launch System rocket and its mobile launch platform to the Vehicle Assembly Building.
The malfunction affected the rocket's upper stage, known as the Interim Cryogenic Propulsion Stage, NASA officials said. Engineers identified the issue after a successful fueling test last week, when the helium system failed to repressurize despite normal performance in prior rehearsals and two earlier tests. NASA opted for the rollback to conduct repairs in the Vehicle Assembly Building.
The four-mile journey involves a combined weight of about 23.6 million pounds, NASA said: The SLS rocket weighs 3.5 million pounds, the mobile launch platform 11.3 million pounds and the crawler-transporter 6.6 million pounds. The process is expected to take 10 to 12 hours, with stops for safety and weather checks. NASA live updates confirmed the crawler began moving on schedule.
The delay shifts the Artemis II launch from no earlier than early March 2026 to at least April 2026, according to reports from Space.com and others. NASA had targeted March 6 before the issue surfaced. The mission will send four astronauts on a lunar flyby to validate the SLS and Orion spacecraft for future moon landings.
"Engineers were unable to repressurize the upper stage's helium system," CBS News reported, citing NASA details. "Pressurized helium is used to push propellants to the ICPS engine, to dry out and drain tanks and propellant lines and to 'purge' other cavities to minimize the risk of fire."
The helium system pressurizes propellant tanks with inert gas to ensure fuel reaches the engine, officials explained. It also drains lines and purges areas to reduce fire risks. The failure followed tests around Feb. 19-20, when other systems performed as expected. NASA linked the decision to ongoing reliability concerns with the Interim Cryogenic Propulsion Stage, which has seen similar ground-test anomalies before.
Artemis I, an uncrewed test flight in 2022, succeeded after delays and orbited the moon at a distance of 1.3 million miles. This rollback echoes Apollo-era operations, NASA noted, using the same 1960s crawler-transporter that carried Saturn V rockets. A similar move occurred in 2021 with Boeing's Starliner spacecraft due to valve issues. "We have to have the maturity to stop, investigate and sit before flying again," NASA official Kathy Lueders said at the time, according to reports.
Artemis II is NASA's first crewed mission in the Artemis program, which aims to return humans to the moon. The program has faced scrutiny over costs, with each SLS launch exceeding $4 billion, according to agency estimates. Delays have pushed timelines from original 2024-2025 targets.
Engineers will investigate the helium failure in the Vehicle Assembly Building, NASA said. Repairs may involve replacing parts, though the root cause is unclear. The problem emerged during post-test checks after recent fueling successes that had raised hopes for a March launch.
The rollback highlights challenges with SLS cryogenic systems. Boeing and Lockheed Martin built the SLS and Orion components, while Aerojet Rocketdyne supplied the engines. NASA oversees operations at Kennedy Space Center.
Weather conditions, including winds within safety limits, allowed the start, according to live coverage. The crawler used hydraulics to lift the assembly off support pedestals before the slow move.
Competition from reusable systems like SpaceX's Starship has intensified focus on SLS reliability. Artemis II parallels Apollo 8 in 1968, the first crewed lunar orbit. NASA has not released a precise repair timeline, cost impact or crew details.
Officials stressed thorough checks before launching humans. The mission will test systems for Artemis III and beyond, without a lunar landing. NASA plans to return the rocket to the pad after fixes for more tests.
Sources confirmed the launch pad as 39B, with no major contradictions across outlets like Space.com and Mashable. The incident underscores the precision needed for deep-space missions.
