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

A persistent helium leak in the Orion capsule, while deemed safe for the upcoming Artemis II crew, will force a hardware redesign before the next lunar mission. | Contesto: cronaca

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

Contesto

The Orion spacecraft, slated to carry four astronauts around the Moon on the Artemis II mission, has a confirmed helium leak in its propulsion system, but NASA officials have determined it poses no threat to crew safety during reentry. The issue, identified during testing and traced to a specific valve, is expected to be manageable for the duration of the 10-day circumlunar flight scheduled for September 2025. However, the agency has confirmed that a permanent hardware fix will be required before the subsequent Artemis III mission, which aims to land astronauts on the lunar surface. The leak is not an isolated incident. Similar, though smaller, helium seeps were observed on the uncrewed Artemis I test flight in 2022. The recurrence on the Artemis II vehicle underscores a systemic vulnerability within the design of this critical subsystem. Helium is an inert pressurant used to push propellant from Orion's service module tanks to its engines. While the spacecraft carries a substantial reserve, a significant or worsening leak could, in a worst-case scenario, compromise the vehicle's ability to perform precise maneuvers in lunar orbit or on its return journey to Earth. Engineers have spent months analyzing the fault, conducting tests to simulate mission conditions and model the leak's behavior. Their conclusion that the Artemis II crew will be safe is based on a conservative analysis showing the leak rate would remain within the system's tolerance margins for the shorter Artemis II profile. "We understand the mechanism causing the leak," a senior program manager stated, emphasizing that extensive ground testing has provided high confidence in the current mission's viability. The crew—NASA's Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian Space Agency astronaut Jeremy Hansen—has been kept fully informed of the analysis. The decision to fly Artemis II with the known flaw while mandating a redesign for Artemis III reflects the complex risk calculus of human spaceflight. Schedule pressure to maintain the momentum of the lunar program is balanced against the absolute priority of crew safety. For Artemis II, a circumlunar flight without a landing,...

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Categoria: cronaca