NASA Postpones Artemis II Launch Due to Helium System Issue
NASA has delayed the Artemis II mission after detecting a helium flow issue in the rocket's upper stage, necessitating a rollback to the Vehicle Assembly Building for repairs.
NASA has postponed the Artemis II mission following the discovery of a helium flow issue in the Space Launch System (SLS) rocket's interim cryogenic propulsion stage. The problem was identified during routine operations on February 21, prompting plans to return the rocket and Orion spacecraft to the Vehicle Assembly Building (VAB) at Kennedy Space Center for further inspection and repairs.
"Returning to the Vehicle Assembly Building at Kennedy is required to determine the cause of the issue and fix it," NASA stated.
The helium system is essential for purging the engines and pressurizing the fuel tanks. This issue arises shortly after NASA addressed previous hydrogen fuel leaks, which had already delayed the mission.
The Artemis II mission aims to send a crew of four—three Americans and one Canadian—on a journey around the Moon and back, marking the first crewed lunar flight since the Apollo era. The astronauts remain on standby in Houston as preparations continue.
NASA is working to preserve an April launch window, but the timeline will depend on the outcome of the repairs and subsequent testing.