Boeing CST-100 Starliner
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| Boeing CST-100 Starliner | |
|---|---|
 NASA, Johnson Space Center · Public domain · source | |
| Name | CST-100 Starliner |
| Manufacturer | Boeing |
| Country | United States |
| Operator | Boeing, National Aeronautics and Space Administration |
| Applications | Crew transport to International Space Station, low Earth orbit missions |
| Spacecraft type | Crew capsule |
| Status | Active (program) |
| First flight | 2019 (uncrewed test) |
| Launch mass | ~13,000 kg |
| Dimensions | ~4.5 m diameter |
Boeing CST-100 Starliner is a commercial crew capsule developed by Boeing in partnership with National Aeronautics and Space Administration for transporting personnel to International Space Station, low Earth orbit destinations, and commercial habitats. Funded under the Commercial Crew Program with contracts negotiated during the Obama administration and executed into the Trump administration and Biden administration eras, the spacecraft complements crewed vehicles such as SpaceX Crew Dragon and serves as part of the United States' post-Space Shuttle human spaceflight architecture. The Starliner program intersects aerospace suppliers like United Launch Alliance and launch sites including Cape Canaveral Space Force Station.
Development
Development began after Boeing won a Phase 2 contract from National Aeronautics and Space Administration in the early 2010s under the Commercial Crew Program alongside SpaceX. Boeing worked with contractors such as Collins Aerospace, United Launch Alliance, Parsons Corporation, and Boeing Defense, Space & Security divisions, integrating heritage from the Mercury program and lessons from the Space Shuttle and Apollo program. The program experienced schedule shifts tied to certification milestones overseen by Federal Aviation Administration and technical audits by NASA Inspector General and Government Accountability Office. Major industrial partners and supply-chain firms included Aerojet Rocketdyne, Honeywell Aerospace, Thales Alenia Space, and Dynetics.
Design
Starliner is a reusable, pressurized crew capsule designed to carry up to seven astronauts or a mix of crew and cargo to International Space Station and other low Earth orbit platforms such as proposed commercial stations from firms like Axiom Space. The spacecraft employs an internal avionics suite from Boeing integrated with software tested against standards used by NASA and military contractors including Raytheon Technologies. Propulsion uses hypergolic maneuvering engines similar in lineage to engines by Aerojet Rocketdyne and structural materials drawing on composites used by Lockheed Martin and Northrop Grumman. Thermal protection and parachute systems leverage experience from Orion (spacecraft) and capsule recovery systems studied during the Gemini program. Launch vehicles selected include the Atlas V operated by United Launch Alliance and potential future launches on commercial heavy boosters from SpaceX and Blue Origin.
Operational history
Operational milestones followed staged tests from pad integration at Kennedy Space Center processing facilities to docking rehearsals at Boeing's Commercial Crew and Cargo Processing Facility. The program's timeline parallels crewed flight entries by Soyuz (spacecraft) and competing commercial flights such as Dragon 2. Early flights influenced NASA manifest planning alongside missions like Expedition 61 and crew rotations involving astronauts from European Space Agency, Japan Aerospace Exploration Agency, and Canadian Space Agency. Interagency coordination included agreements with Roscosmos and policy discussions in the United States Congress over NASA's commercial procurement strategy.
Testing and certification
Testing encompassed uncrewed orbital flight tests, pad abort tests, environmental qualification at facilities used by Lockheed Martin and General Electric, and integrated mission simulations with flight control centers at Johnson Space Center and Boeing Mission Control Center. Certification required compliance with standards from NASA's human-rating process and reviews by the Federal Aviation Administration and the National Transportation Safety Board for recovery operations. Flight test anomalies led to investigations involving panels with representatives from NASA's Office of Safety and Mission Assurance and external auditors such as the Government Accountability Office and National Academy of Sciences committees.
Missions and crewed flights
Starliner missions include uncrewed and crewed demonstration sorties coordinated with Expedition rotations on International Space Station. Crewed crews have been drawn from astronaut corps including NASA Astronaut Corps, personnel from European Space Agency, Japan Aerospace Exploration Agency, and Canadian Space Agency. Missions have been scheduled in manifest windows shared with cargo missions like SpaceX CRS resupply flights and international partners' resupply vehicles such as Progress (spacecraft) and HTV (H-II Transfer Vehicle). Recovery operations utilize maritime assets coordinated with United States Navy range support and search-and-rescue protocols practiced with units from United States Coast Guard.
Variants and upgrades
Planned variants and upgrades explore longer-duration life-support adaptations for private-commercial habitats proposed by Axiom Space and modular mission kits compatible with commercial stations from companies like Bigelow Aerospace and Nanoracks. Avionics refreshes draw on technology roadmaps similar to those in Orion (spacecraft) upgrades and avionics suites used in Boeing 787 and military platforms by Northrop Grumman. Propulsion and heatshield improvements reference development paths taken by Sierra Nevada Corporation's proposals and thermal protection system work from NASA Ames Research Center research. Docking interface evolution aligns with the International Docking System Standard and potential interoperability with vehicles from Roscosmos and European Space Agency partners.
Program management and contracts
Program management has been a coordination among Boeing, NASA, prime contractors like United Launch Alliance, and oversight bodies in United States Congress and Office of Management and Budget. Contracting mechanisms included fixed-price milestones under the Commercial Crew Program awards and supplemental agreements following performance reviews by the NASA Inspector General and Government Accountability Office. Business decisions were influenced by competition with SpaceX, partnerships with suppliers such as Collins Aerospace and Aerojet Rocketdyne, and policy directions set during administrations from Barack Obama through Joe Biden. Financial oversight and schedule baselines drew scrutiny in hearings before the House Committee on Science, Space, and Technology and the Senate Committee on Commerce, Science, and Transportation.