NASA Completes Artemis II Wet Dress Rehearsal, Resolves Hydrogen Leak, Targets March Launch

NASA has completed a wet dress rehearsal for its Artemis II mission, successfully loading cryogenic fuel into the Space Launch System (SLS) tanks, finalizing Orion spacecraft closeout procedures, and safely draining the rocket, reports customreceipt.com with reference to NASA. The two-day prelaunch test is designed to evaluate fueling operations, identify potential issues, and ensure all systems function properly before committing to a launch. Engineers encountered several technical challenges but met many of the planned objectives, setting the stage for a potential launch window in March.

The initial launch opportunity in February has been postponed, meaning Artemis II astronauts—Reid Wiseman, Victor Glover, Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen—will exit quarantine that began in Houston on January 21 and will not travel to NASA’s Kennedy Space Center in Florida as originally planned. The crew will enter quarantine again roughly two weeks before the next target launch date.

NASA initiated a roughly 49-hour countdown at 8:13 p.m. EST on January 31. During fueling operations on February 2, engineers monitored the impact of cold weather on launch systems and implemented procedures to protect the hardware. Low temperatures delayed the start of tanking, as certain components needed to reach acceptable operational temperatures before propellant loading could begin.

While loading cryogenic fuel, engineers spent several hours addressing a liquid hydrogen leak in an interface that routes propellant to the rocket’s core stage. Corrective measures included halting the hydrogen flow, warming the interface to reseat seals, and carefully adjusting fuel flow. Ultimately, all tanks in both the core stage and the interim cryogenic propulsion stage were successfully filled.

A five-person team then proceeded to the launch pad to complete Orion spacecraft closeout operations. Terminal countdown operations were simulated, reaching approximately five minutes remaining before the ground launch sequencer automatically paused the countdown due to a spike in the hydrogen leak rate. Additionally, a recently replaced valve for Orion hatch pressurization required retorquing, extending closeout time. Cold temperatures affected cameras and other equipment but did not impede the rehearsal. Communication dropouts among ground teams, which had been ongoing in previous weeks, were noted during the test.

Updated procedures were applied to purge Orion’s service module cavities with breathable air instead of gaseous nitrogen to maintain crew and ground team safety during hatch closeout. NASA plans to review all data from the rehearsal, resolve identified issues, and conduct further testing before establishing an official launch date.

Agency leaders, including NASA Administrator Jared Isaacman, are scheduled to present initial wet dress rehearsal results during a news conference at 1 p.m. EST, which will be streamed live on NASA’s YouTube channel. Crew safety remains the top priority as the Artemis II team prepares for the upcoming mission.

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