Artemis II: NASA Resolves Helium Flow Issue, Eyes April Launch

NASA has addressed a helium flow issue that prompted the return of the Space Launch System (SLS) rocket and Orion spacecraft to the Vehicle Assembly Building (VAB) last month. Preparations are now underway to move the vehicle back to the launch pad at Kennedy Space Center in Florida, with a launch currently targeted for no earlier than April 2026.

Hydrogen Leak and Initial Fueling Test

The SLS rocket had initially passed a key fueling test on February 21, 2026, successfully loading super-cold propellants. This test appeared to overcome a previous hydrogen leak that had delayed the mission in early February. NASA reported no major problems during the fueling demonstration.

Helium Flow Issue and Return to VAB

However, a new issue emerged just one day after the successful fueling test. Ground teams were unable to flow helium into the rocket’s upper stage. Since the umbilical lines connecting to the upper stage are only accessible within the VAB, mission managers decided to roll the rocket back to the assembly building for troubleshooting on February 25, 2026. Kennedy Space Center Visitor Complex confirmed the rollback.

Repair and Validation

Within a week, engineers identified the source of the helium flow issue: a seal within a quick disconnect obstructing the pathway. NASA stated that the team removed the quick disconnect, reassembled the system, and validated the repairs by running a reduced flow rate of helium through the mechanism. Engineers are currently assessing how the seal became dislodged to prevent recurrence. NASA

Artemis II Mission Overview

Artemis II is planned as the first crewed mission of the Orion spacecraft and the second flight of the SLS rocket. The 10-day mission will carry NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen, on a trajectory around the Moon and back to Earth. Wikipedia notes that Glover will become the first person of color, Koch the first woman, and Hansen the first person not from the United States to travel around the Moon.

Launch Viewing Opportunities

Launch viewing packages at the Kennedy Space Center Visitor Complex are currently sold out. Purchasers of these packages can find arrival information once NASA confirms the launch date and time. Kennedy Space Center Visitor Complex provides details on launch viewing options.