NASA and its primary contractor Northrop Grumman are misaligned on the repair timeline for the corroded HALO module destined for the Lunar Gateway, with Northrop committing to Q3 2026 completion while NASA Administrator Jared Isaacman publicly questions whether deterministic…
The Corrosion Gap: NASA's Doubts vs. the Contractor's Timeline on HALO Repairs
Northrop Grumman says it will finish repairs on NASA's HALO module by the end of Q3 2026. Five days later, NASA Administrator Jared Isaacman posted on X that he is "not sure there is a deterministic approach to repair" — and that he is uncertain whether fixing the module is even warranted. That gap — between the contractor's commitment and the agency's doubt — is the hardware story at the center of the Lunar Gateway's corrosion problem.
The corrosion affected not one program but three. HALO, the Habitation and Logistics Outpost built for NASA's lunar Gateway, arrived at Northrop Grumman's facility in April 2025 already showing signs of corrosion on its primary structure. The European Space Agency's I-Hab module, built for the same station, developed the same problem at the same supplier. Then Axiom Space confirmed it had observed "a similar phenomenon" on the first module of its commercial space station — also built by the same company, Thales Alenia Space SpaceNews.
Thales Alenia Space is not a backwater supplier. It built roughly half the pressurized volume of the International Space Station, including the Columbus laboratory and Harmony module, and continues to manufacture the structure for Northrop's Cygnus cargo spacecraft. The company's own statement, via European Spaceflight, noted that "a metallurgical behavior of this kind occurred decades ago during the manufacturing of elements for the International Space Station" — and that the ISS modules from that era are still operating reliably after 25 years European Spaceflight. ESA has set up a tiger team to investigate and says the I-Hab corrosion "did not constitute a showstopper," though the agency acknowledged it was in better condition than HALO.
Northrop Grumman described the issue as "a manufacturing irregularity" and said repairs are on track for Q3 2026 SpaceNews. Thales Alenia Space called it "a well-known metallurgical behavior" that would be fixed on the same timeline. But Isaacman's skepticism, first voiced at an April 22 House Science Committee hearing and reinforced in his April 25 X post, stands in stark contrast to the contractor's confidence Ars Technica.
The story is not simply about corroded modules. Thales Alenia Space is effectively the only qualified manufacturer of large pressurized habitation modules in the Western human spaceflight ecosystem. The same metallurgical inconsistency that slipped through on HALO also infected ESA's contribution to Gateway and Axiom's commercial station — three programs, one supplier, one defect. For Axiom, which has contracted Thales for multiple modules ahead of a planned 2028 launch for Module 1, the question is whether the same root cause has been fully addressed or whether the repair is superficial. Axiom's COO said the company has "identified the root cause and developed a mitigation" and sees "no impact to our launch dates" SpaceNews.
The repair timeline — Q3 2026 — is the hinge point. If Northrop delivers on time and the modules perform, this is a story about a supplier that got caught and corrected. If Isaacman's doubts are justified and the modules are effectively write-offs, it is a story about stranded assets, programmatic restructuring, and a quiet reckoning with single-point-of-failure risk across the entire next-generation orbital infrastructure stack.