Space

Boeing forced to scrub first crewed Starliner launch to the space station

Denise Chow
WATCH LIVE

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In this handout provided by the National Aeronautics and Space Administration (NASA), A United Launch Alliance Atlas V rocket with Boeing's CST-100 Starliner spacecraft aboard is seen as it is rolled out of the Vertical Integration Facility to the launch pad at Space Launch Complex 41 ahead of the NASA's Boeing Crew Flight Test, Saturday, May 4, 2024 at Cape Canaveral Space Force Station in Florida. 
Joel Kowsky | NASA | Handout | Getty Images

NASA and Boeing were forced to stand down from an attempted launch to the International Space Station on Monday because of a last-minute issue that cropped up with a valve on the spacecraft's rocket.

Boeing's Starliner capsule had been scheduled to lift off at 10:34 p.m. ET from Florida's Cape Canaveral Space Force Station on its first crewed test flight. NASA astronauts Barry "Butch" Wilmore and Sunita Williams were on board the capsule and strapped into their seats when the launch attempt was called off, roughly two hours ahead of the planned liftoff.

A new launch date has not yet been announced.

Mission controllers declared a launch "scrub" after an anomaly was detected on an oxygen valve on United Launch Alliance's Atlas V rocket, which the Starliner capsule was to ride into orbit.

In this handout provided by the National Aeronautics and Space Administration (NASA), a United Launch Alliance Atlas V rocket with Boeing's CST-100 Starliner spacecraft aboard is seen illuminated by spotlights on the launch pad at Space Launch Complex 41 ahead of the NASA's Boeing Crew Flight Test on May 4, 2024 at Cape Canaveral Space Force Station in Florida.
Joel Kowsky | NASA | Handout | Getty Images

The crewed Starliner flight, when it occurs, will be a crucial final test before NASA can authorize Boeing to conduct routine flights to and from the space station.

Officials at NASA and Boeing have said safety is paramount for the spacecraft's first flight with humans onboard.

The scrubbed launch is yet another setback for Boeing, which has already dealt with years of delays and budget overruns with its Starliner program. It has fallen significantly behind SpaceX, which has been flying crewed missions to and from the space station for NASA since 2020.

More from NBC News:

Both SpaceX's Crew Dragon capsule and Boeing's Starliner craft were developed as part of NASA's Commercial Crew Program. The initiative began more than a decade ago, following the retirement of the agency's space shuttles, to support private companies in building new space vehicles to take astronauts to low-Earth orbit.

Starliner's first uncrewed flight in 2019 was thwarted by software issues, forcing mission controllers to cut the test short before the vehicle could attempt to rendezvous and dock with the ISS. A second attempt was then delayed several times by fuel valve issues, and it wasn't until 2022 that Boeing was able to carry out a successful uncrewed flight to and from the space station.