tech
February 15, 2026
NASA has a new problem to fix before the next Artemis II countdown test
“We observed materially lower leak rates compared to prior observations during WDR-1.”
TL;DR
- NASA is working to resolve hydrogen fueling problems with the Space Launch System (SLS) rocket before the Artemis III mission.
- The Artemis II mission, currently on the launch pad in Florida, is preparing for a second countdown rehearsal due to a hydrogen fuel leak.
- Similar leaks delayed the first test flight of the SLS rocket in 2022, and the issue reappeared during a practice countdown for Artemis II.
- Engineers have traced the leaks to ground support equipment, specifically the Tail Service Mast Umbilicals (TSMUs) that connect fueling lines to the rocket.
- A recent 'confidence test' revealed a new problem reducing fuel flow, which is suspected to be caused by a faulty filter.
- NASA reassessed and raised its safety limit for hydrogen gas concentration from 4% to 16% based on test data.
- For Artemis III, NASA plans to redesign propellant loading interfaces and 'cryoproof' the vehicle before it reaches the launch pad.
- The SLS rocket is expensive, with limited production and no full-size test model, making each launch a critical event.
- NASA is mandated to fly the SLS rocket through the Artemis V mission but plans to incorporate newer, cheaper, reusable rockets into the program.
- The next launch opportunities for Artemis II begin March 3, with further dates in April and May if needed.
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