Orion helium leak no threat to Artemis II reentry, but will require redesign

NASA confirms a persistent helium leak in the Orion capsule poses no danger to the upcoming Artemis II crew but mandates a valve redesign for future missions. | Contesto: cronaca

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• Orion helium leak no threat to Artemis II reentry, but will require redesign

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A persistent helium leak in the Orion spacecraft's propulsion system will not endanger the four astronauts slated to fly around the Moon on the Artemis II mission, NASA officials confirmed today. However, the agency has determined that the component responsible for the leak must be redesigned before Orion's next lunar flight. The decision follows the detection of similar, though non-hazardous, leaks during both the uncrewed Artemis I test flight in 2022 and subsequent testing of the Artemis II vehicle. The issue centers on valves within the spacecraft's service module, which is provided by the European Space Agency. Helium is a crucial, inert pressurant used to push propellant from the tanks to Orion's main engine and maneuvering thrusters. While the system is designed with significant redundancy, the recurring leak indicates a design flaw that engineers now believe must be corrected for the long-term sustainability and safety of the lunar program. "We understand the mechanism, and we have mitigated the risk for Artemis II," a senior program manager stated, emphasizing that existing flight rules and onboard helium reserves are more than sufficient to complete the upcoming crewed mission without incident. The Artemis II mission, currently scheduled for no earlier than September 2025, will mark the first human voyage to lunar vicinity since 1972. Commander Reid Wiseman, pilot Victor Glover, and mission specialists Christina Koch and Jeremy Hansen are training for the approximately 10-day flight, which will test Orion's life support and systems with a crew before attempting a lunar landing on Artemis III. The confirmation that the helium leak does not threaten their safe return to Earth removes a significant shadow of uncertainty from the pathfinder crewed mission. This is not the first technical challenge for the Orion program, but it underscores the iterative nature of developing a new deep-space capsule. Identifying and addressing such flaws between missions is a core part of the test-flight philosophy. The redesign effort will focus on the valve's seals and materials to prevent helium seepage under the extreme temperatures and vacuum of space. The work will be...

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Categoria: cronaca