Source: WESH 2 News
“Boeing was set to launch its Starliner rocket on a historic crewed mission Monday, but the United Launch Alliance’s launch director said that mission will not continue as planned. Just about two hours before the launch, Tom Heter III scrubbed the launch of the ULA Atlas V rocket, which was supposed to carry two humans on board for the first time. Officials say there was a mechanical issue with an oxygen relief valve in the second stage Centaur. NASA veteran astronauts — Starliner’s Commander Butch Wilmore and Pilot Suni Williams — were already suited up in the Boeing pressure suits and were just about done with the process of strapping into their seats when the scrub was announced. … There was no word on what data made officials concerned or when to expect another launch attempt.” (05/06/24)
https://www.wesh.com/article/boeing-starliner-launch-scrubbed-reason/60708121