NASA is reviewing a potential delay to its Artemis II mission after engineers detected an unexpected interruption in helium flow during routine rocket system checks, raising safety concerns.

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• NASA identified an unexpected helium flow interruption in the Space Launch System rocket’s upper stage during routine testing.
• The issue affects the interim cryogenic propulsion stage, critical for engine purging and fuel tank pressurisation before launch.
• Officials indicated that a faulty filter, valve, or connection plate may be responsible for the stalled helium flow.
• To access and repair the affected area, the 322-foot rocket may need to be rolled back to the Vehicle Assembly Building.
• NASA Administrator Jared Isaacman confirmed that the March 6 launch window is no longer under consideration.
• The earliest possible launch opportunity is now expected in April, pending further technical assessments and repairs.
• The helium issue is unrelated to previous hydrogen fuel leaks that delayed earlier launch preparations.
• Artemis II will mark humanity’s first crewed lunar flyby mission in more than 50 years, following the uncrewed Artemis I mission in 2022.