The initial launch attempt on May 6 was going pretty smoothly. But two hours before liftoff, the launch was scrubbed due to an off-seat pressure valve on the second stage of the Atlas V rocket.
While NASA had the spacecraft back in its assembly building, engineers decided to take a closer look at another issue that had surfaced after the scrub: a helium leak on the service module of the Boeing Starliner spacecraft.
While taking a close look at the helium leak, the team decided to review the propulsion system for Starliner one more time to ensure they hadn't missed anything. They uncovered a redundancy issue.
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