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Forum: Commercial Space - Military Space
Topic: Boeing's CST-100 Starliner Crew Flight Test

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Message to Edit: HTML is ON UBB Code is ON Smilies Legend	Originally posted by Robert Pearlman on 05-07-2024 07:01 PM <blockquote><font size="+0">[b]Faulty valve to be replaced, launch retargeted[/b]</font> The launch of Boeing's Crew Flight Test is now targeted for no earlier than Friday, May 17 at 6:16 p.m. EDT (2216 GMT). Following a thorough data review completed on Tuesday (May 7), United Launch Alliance (ULA) decided to replace a liquid oxygen tank pressure regulation valve on the Atlas V rocket’s Centaur upper stage. ULA plans to roll the rocket back to its Vertical Integration Facility on Wednesday to begin the replacement. The ULA team will perform leak checks and functional checkouts in support of the next launch attempt. The oscillating behavior of the valve during prelaunch operations ultimately resulted in mission teams calling a launch scrub on May 6. After the ground crews and astronauts Butch Wilmore and Suni Williams safely exited from Space Launch Complex-41, the ULA team successfully commanded the valve closed and the oscillations were temporarily dampened. The oscillations then re-occurred twice during fuel removal operations. After evaluating the valve history, data signatures from the launch attempt, and assessing the risks relative to continued use, the ULA team determined the valve exceeded its qualification and mission managers agreed to remove and replace the valve.</blockquote>
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