{"id":9612,"date":"2026-02-20T17:02:59","date_gmt":"2026-02-20T09:02:59","guid":{"rendered":"https:\/\/wp-productionenv-bjg9h2g2bgg5b8aa.southeastasia-01.azurewebsites.net\/news\/moon-mission-fueling-test-concludes-with-no-major-problems\/"},"modified":"2026-02-20T17:02:59","modified_gmt":"2026-02-20T09:02:59","slug":"moon-mission-fueling-test-concludes-with-no-major-problems","status":"publish","type":"post","link":"https:\/\/starpath.global\/news\/moon-mission-fueling-test-concludes-with-no-major-problems\/","title":{"rendered":"Moon mission fueling test concludes with no major problems"},"content":{"rendered":"
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The countdown clock at the Kennedy Space Center Press Site stops at T-29 seconds at the end of the second terminal countdown demonstration, bringing an end to the wet dress rehearsal tanking test on Thursday, Feb. 19, 2026. Image: John Pisani\/Spaceflight Now<\/figcaption><\/figure>\n

NASA and contractor engineers pumped more than 750,000 gallons of supercold propellants into the agency\u2019s huge Space Launch System rocket Thursday without any signs of hydrogen leaks or any other significant problems in a major step toward launching four astronauts on a flight around the moon as early as March 6.<\/p>\n

The practice countdown began Tuesday night, kicking off a carefully choreographed series of steps to ready the world\u2019s most powerful operational rocket for what amounted to a simulated launch Thursday at 8:42 p.m. EST. Controllers then carried out additional tests to make sure the team can recycle, hold and restart an actual launch countdown as needed to handle unexpected problems.<\/p>\n

The initial stages of the rehearsal countdown went well and at 9:35 a.m. Thursday, Launch Director Charlie Blackwell-Thompson gave her \u201cgo\u201d to begin the multi-hour process of pumping 196,000 gallons of liquid oxygen and 537,000 gallons of liquid hydrogen fuel into the SLS rocket\u2019s first stage. The second stage was loaded with another 22,500 gallons of oxygen and hydrogen propellants.<\/p>\n

Unlike the rocket\u2019s first fueling test earlier this month, when hydrogen leaks forced the team to call off the countdown, sensors detected no significant leaks the second time around and the rocket\u2019s tanks were topped off without incident.<\/p>\n

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Two tail service masts, each about three stories tall, provide cryogenic propellant lines and electrical cable connections to NASA\u2019s Artemis II SLS (Space Launch System) core stage rocket at Launch Complex 39B at NASA\u2019s Kennedy Space Center in Florida on Tuesday, Feb. 10, 2026. The Artemis II test flight will take Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch from NASA, and Mission Specialist Jeremy Hansen from the CSA (Canadian Space Agency), around the Moon and back to Earth. Image: NASA\/Ben Smegelsky<\/figcaption><\/figure>\n

For the remainder of the dress rehearsal, propellants were added as needed to make up for the relatively small amounts of hydrogen and oxygen that normally warm and \u201cboil off\u201d in their tanks. Another milestone presumably was reached in the final 10 minutes of the countdown when the propellant tanks were to be pressurized as they would be for an actual launch. Again, no problems were noted.<\/p>\n

While detailed analysis remains to be completed, the preliminary results were a positive sign Artemis II commander Reid Wiseman, Victor Glover, Christina Koch and Canadian astronaut Jeremy Hansen may, in fact, be cleared for launch in just two weeks. Hoping for the best, the crew planned to enter pre-flight medical quarantine Friday.<\/p>\n

It will be the first piloted flight to the moon since the final Apollo landing in 1972, carrying the crew farther from Earth than any astronauts in history. Wiseman and his crewmates will also be the first to ride into space atop the 322-foot-tall Space Launch System rocket, making only its second flight, and the first to fly aboard an Orion deep space crew capsule.<\/p>\n

More important, the flight will serve as a major step toward the follow-on Artemis III mission to land astronauts near the moon\u2019s south pole in 2028.<\/p>\n

NASA originally planned to launch the Artemis II mission early this month, but NASA engineers and contractors ran into problems during an initial dress rehearsal countdown when hydrogen leaks were detected near the base of the rocket.<\/p>\n

Sensors in a cavity between umbilical plates where the fuel lines are attached to the SLS first stage began detecting hydrogen gas buildups when flow rates were increased after an initial \u201cslow fill\u201d period.<\/p>\n

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A closeup look at the business end of the Space Launch System rocket with two of its four upgraded space shuttle-era main engines at center, flanked by the lower segments of two extended solid-fuel strap-on booster. At liftoff, the hydrogen-fueled engines and solid rocket boosters will generate a combined 8.8 million pounds of thrust, making the SLS the most powerful operational rocket in the world. Image: NASA<\/figcaption><\/figure>\n

After troubleshooting, engineers were able to press ahead with the test, keeping leak rates within acceptable limits by varying flow rates and temperatures. That allowed them to safely fill the first and second stage propellant tanks and then to replenish them as needed.<\/p>\n

But late in the countdown, when engineers began pressurizing the first stage as they would for an actual launch, the leak rate in the fueling umbilical suddenly shot up, climbing toward concentrations of 16% in the inert nitrogen gas flowing through the cavity. Beyond that, the risk of fire becomes a real threat.<\/p>\n

The dress rehearsal was called off before the team could work through the planned countdown recycle options.<\/p>\n

After studying test data, engineers decided to replace two seals that were thought to be responsible for the leak. A second \u201cmini\u201d tanking test was carried out last Thursday when a small amount of liquid hydrogen was pumped into the core stage to confirm a leak-free environment.<\/p>\n

But a filter in the ground system apparently froze, reducing the flow rates. Even so, NASA said in a blog post, \u201cthe test provided enough data to allow engineers to plan toward a second wet dress rehearsal this week.\u201d No other details were provided, but the seals apparently worked as required during the fueling exercise Thursday.<\/p>\n","protected":false},"excerpt":{"rendered":"

The countdown clock at the Kennedy Space Center Press Site stops at T-29 seconds at the end of the second terminal countdown demonstration, bringing an end to the wet dress rehearsal tanking test on Thursday, Feb. 19, 2026. Image: John Pisani\/Spaceflight Now NASA and contractor engineers pumped more than 750,000 gallons of supercold propellants into […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[783,190,787],"class_list":["post-9612","post","type-post","status-publish","format-standard","hentry","category-news","tag-artemis-2","tag-nasa","tag-space-launch-system"],"acf":[],"_links":{"self":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/9612"}],"collection":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/comments?post=9612"}],"version-history":[{"count":0,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/posts\/9612\/revisions"}],"wp:attachment":[{"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/media?parent=9612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/categories?post=9612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starpath.global\/blog\/wp-json\/wp\/v2\/tags?post=9612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}