SpaceX delays flight to replace NASA’s stuck astronauts after launch pad problem

A SpaceX Falcon 9 rocket with a crew of four aboard the Crew Dragon spacecraft scrubbed prior to liftoff for a mission to the International Space Station from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, March 12, 2025. (AP Photo/Terry Renna)

CAPE CANAVERAL, Fla. (AP) — A launch pad problem prompted SpaceX to delay a flight to the International Space Station on Wednesday to replace NASA’s two stuck astronauts.

The new crew needs to get to the International Space Station before Butch Wilmore and Suni Williams can head home after nine months in orbit.

Concerns over a critical hydraulic system arose less than four hours before the Falcon rocket’s planned evening liftoff from NASA’s Kennedy Space Center. As the countdown clocks ticked down, engineers evaluated the hydraulics used to release one of the two arms clamping the rocket to its support structure. This structure needs to tilt back right before liftoff.

Crew 10, from left, cosmonaut Kirill Peskov, astronaut Nichole Ayers, astronaut Anne McClain and JAXA astronaut Takuya Onishi leave the Operations and Checkout building before heading to Launch Pad 39-A at the Kennedy Space Center in Cape Canaveral, Fla., for a mission to the International Space Station, Wednesday, March 12, 2025. (AP Photo/John Raoux)

Already strapped into their capsule, the four astronauts awaited a final decision, which came down with less than an hour remaining in the countdown. SpaceX canceled for the day. Officials later said the launch was off until at least Friday.

Once at the space station, the U.S., Japanese and Russian crew will replace Wilmore and Williams, who have been up there since June. The two test pilots had to move into the space station for an extended stay after Boeing’s new Starliner capsule encountered major breakdowns in transit.

Starliner’s debut crew flight was supposed to last just a week, but NASA ordered the capsule to return empty and transferred Wilmore and Williams to SpaceX for the return leg.