NASA and Boeing were forced once again to call off the first crewed launch of the company’s Starliner spacecraft.
NASA astronauts Barry “Butch” Wilmore and Sunita Williams were scheduled to lift off aboard the Starliner from Florida’s Cape Canaveral Space Force Station on Saturday at 12:25 p.m. ET. The flight to the International Space Station would have been the vehicle’s first with a crew.
The launch attempt was scrubbed with only 3 minutes and 50 seconds to go in the countdown — yet another setback for Boeing, which has already dealt with years of delays and budget overruns with its Starliner program.
This crewed test flight would have been the final step needed for Boeing to show that the Starliner could safely ferry astronauts to and from the space station. A successful mission would have enabled NASA to authorize Boeing to conduct routine trips to the orbiting outpost, thereby giving the agency a long-awaited second option to SpaceX’s Crew Dragon capsule.
The decision to call off the launch was made after an automatic hold was triggered on a computer known as the ground launch sequencer, which controls operations in the final minutes of a launch countdown.
“These kinds of holds occur when a command goes out and the computer cannot verify the proper response to a command,” said Dillon Rice, a systems test engineer and launch conductor at United Launch Alliance. A joint venture of Boeing and Lockheed Martin, ULA manufactures the Atlas V rocket that the Starliner capsule rides into orbit.
Rice said it’s not yet known what caused the hold.
Launch scrubs are not uncommon in the world of human spaceflight. For this attempt, there is a backup launch opportunity on Sunday — and others on June 5 and 6 — but it’s unclear whether the capsule and rocket will be ready in time.
In an interview hours before before Saturday’s launch was called off, Sunita Williams’ mother, Bonnie Pandya, told NBC News that her daughter was in good spirits. “She’s very upbeat. She’s so happy about going,” Pandya said. “She loves it.”
Boeing’s last launch attempt on May 6 was also called off, that time with roughly two hours remaining in the countdown, after an issue with a valve was detected in the spacecraft’s Atlas V rocket. A separate helium leak was subsequently discovered in the Starliner’s propulsion system, further delaying the key test flight.
The rocket’s valve was replaced, mission controllers said at a news briefing last week, but the helium leak was not repaired before Saturday’s scheduled flight because it was determined to be unlikely to pose a threat to the crew or the spacecraft.
Both SpaceX and Boeing developed their spacecraft as part of NASA’s Commercial Crew Program. The initiative began more than a decade ago to support private companies in building new space vehicles to take astronauts to low-Earth orbit, following the retirement of the agency’s space shuttles.
