NASA Boeing Crew Flight Test Scrubbed Over Possible Valve Malfunction

An Atlas V rocket with Boeing's CST-100 Starliner spacecraft launches from at Cape Canaveral Air Force Station in Fla. on Dec. 20, 2019. Joel Kowsky/NASA via Getty Images

NASA’s Boeing Crew Flight Test to the International Space Station was scrubbed Monday night when an oxygen relief valve malfunctioned during a preflight observation on the United Launch Alliance Atlas V rocket Centaur second stage.

NASA announced in a blog post that the mission would now be delayed until at least Friday while the valve is tested again and possibly replaced, if needed.