NASA plans unpiloted Starliner test flight after astronauts got stuck at space station in 2024

TL;DR

An unpiloted Boeing Starliner capsule test flight is scheduled for December-January.
This test follows a 2024 mission where propulsion system failures stranded two astronauts for over nine months.
The upcoming flight will test upgrades including redesigned propulsion system valves and more robust subsystems.
If the unpiloted flight is successful, a crewed Starliner flight is targeted for mid-2028.
NASA aims to have Boeing Starliner operational to ensure sustained U.S. capability for transporting astronauts to the ISS and for commercial space stations.
The 2024 mission experienced multiple helium leaks and thruster failures, classified as a 'close call' by an independent review board.
Key issues identified included Teflon poppets extruding in propellant valves, thruster failures during descent, and helium leaks.
Boeing is replacing valves, redesigning service module thruster poppets, and adding a faster flight data recorder.
Starliner will continue to use United Launch Alliance's Atlas 5 rockets, with plans to certify ULA's new Vulcan rocket for future Starliner missions.
Having two crew transportation providers (SpaceX and Boeing) is a long-term goal for NASA's Commercial Crew Program.

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