NASA Delays Artemis II Mission After Helium Leak
NASA's Artemis II lunar mission will not launch in March as previously planned due to a newly discovered issue. An "interrupted flow" of helium to the Space Launch System rocket's upper stage has prompted NASA to prepare for a rollback of the vehicle for repairs. This latest problem pushes the earliest possible launch window into April 2026, underscoring the complexities of the large-scale systems integration for the mission.
- The helium is used within the Interim Cryogenic Propulsion Stage (ICPS) to pressurize the liquid hydrogen and oxygen tanks and to purge engine lines. Engineers are investigating several potential failure points, including a valve within the upper stage, a filter, or the interface between the ground supply lines and the rocket. - This is not the first critical leak for the Space Launch System; the uncrewed Artemis I mission was delayed several months in 2022 due to persistent liquid hydrogen leaks at a quick-disconnect fitting, an issue that also recurred during an earlier Artemis II wet dress rehearsal. A different helium valve issue also cropped up during preparations for the Artemis I launch. - The 10-day Artemis II mission is the first crewed flight test for the Orion spacecraft, designed to validate its life-support, communication, and navigation systems in deep space. The crew will fly a lunar free-return trajectory, which would bring the capsule back to Earth even in the event of a primary propulsion system failure after the initial burn. - The four-person crew includes Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch of NASA, along with Mission Specialist Jeremy Hansen of the Canadian Space Agency, who will be the first non-American to fly to lunar space. - The ICPS upper stage is manufactured by United Launch Alliance and Boeing, with its single RL10 engine produced by Aerojet Rocketdyne, an L3Harris Technologies company. For the Artemis IV mission, the ICPS will be replaced by a more powerful Exploration Upper Stage (EUS) with four RL10 engines, enabling the transport of heavier cargo. - This delay adds to a history of schedule slips and cost growth for the program. A 2023 NASA Inspector General report found that contracts for the SLS boosters and engines had resulted in approximately $6 billion in cost increases and more than six years of delays beyond initial projections. The total program cost through 2025 is estimated at $93 billion, with the cost per launch for the first four missions pegged at $4.1 billion.
