page_title: Boeing Orbital Flight Test
section_title: Mission
hierarchical_section_title: Boeing Orbital Flight Test / Mission
caption_attribution_description: English: The Boeing CST-100 Starliner spacecraft is back home at the company's Commercial Crew and Cargo Processing Facility, undergoing inspection after its first flight as part of NASA's Commercial Crew Program, known as the Orbital Flight Test. Starliner launched atop a United Launch Alliance Atlas V rocket from Space Launch Complex 41 at Cape Canaveral Air Force Station (CCAFS) in Florida, Friday, Dec. 20, 2019. The mission successfully landed two days later on Sunday, Dec. 22, completing an abbreviated test that performed several mission objectives before returning to Earth as the first orbital land touchdown of a human-rated capsule in U.S. history.
context_page_description: The Boeing Orbital Flight Test was the first orbital mission of the CST-100 Starliner spacecraft, conducted by Boeing as part of NASA's Commercial Crew Program. The mission was planned to be an eight-day test flight of the spacecraft, involving a rendezvous and docking with the International Space Station, and a landing in the western United States. The mission was successfully launched on 20 December 2019 at 11:36 UTC or 6:36 AM EST, however an issue with the spacecraft's mission elapsed time clock occurred 31 minutes into flight. This anomaly caused the spacecraft to burn into an incorrect orbit, preventing a rendezvous with the ISS. The mission was reduced to just two days, with the spacecraft successfully landing at White Sands Space Harbor on 22 December.
  On 6 April 2020, Boeing announced that they would redo the Orbital Flight Test to prove and meet all of the test objectives. NASA accepted the proposal from Boeing to do another uncrewed test flight, Boeing Orbital Flight Test 2. The redo flight is scheduled for 13 November 2020.
context_section_description: The first Atlas V N22, designated AV-080, launched the CST-100 Starliner spacecraft on an uncrewed test flight to the International Space Station. The capsule was intended to dock with the space station, then return to Earth to land in the Western United States after an orbital shakedown cruise ahead of Boeing Crewed Flight Test.
  OFT is the first flight of an Atlas V without a payload fairing and its first flight with a dual-engine Centaur upper stage. The dual-engine Centaur utilizes two RL10s and is required for Starliner flights in order to provide a launch trajectory that allows for a safe abort at any point in the mission.
  The mission launched successfully on 20 December 2019 at 6:36:43 am EST, but thirty-one minutes after launch the mission elapsed timer (MET) clock made an error and forced an abort to the ISS. During a later press conference, it was revealed that MET was offset by 11 hours.  When it became obvious that the maneuver did not happen, NASA and Boeing tried sending commands to get Starliner back on track, but the position of the spacecraft switching communications between two TDRS satellites made the maneuver misfire inevitable. This resulted in an abort in ISS rendezvous. The decision was made by NASA and Boeing since the spacecraft burned too much fuel to reach the ISS even after Mission Control fixed the MET clock issue. NASA and Boeing officials placed the spacecraft in a different orbit and the entire flight plan had to be redone and the mission was reduced from eight days to three flight days.
  By 7:40 am EST, the Starliner was in a "stable orbit", though orbital insertion was not nominal. It was later confirmed that Starliner had placed itself into a 187 x 222 km orbit. 
  By 8:55 am EST, mission control had realized that docking with the ISS was precluded. Despite not being able to dock and the MET anomaly, Bridenstine stated numerous times during the press conference that "A lot of things went right. And this is in fact why we test."
  On 22 December, Starliner was cleared to reenter the Earth's atmosphere. After deorbiting, Starliner reentered the Earth's atmosphere, before successfully deploying all sets of parachutes. Starliner deployed airbags and successfully touched-down at White Sands Space Harbor at 7:58 AM ET.  Though the ISS rendezvous that was planned for the OFT did not happen, Jim Chilton, vice president for Boeing’s space and launch division, estimated that Starliner has achieved over 60% of the flight objectives, and this could reach over 85% once all the data from the spacecraft is retrieved and analyzed.
  The spacecraft will later be reused on mission USCV-2. Its commander, Sunita Williams, informally dubbed the spacecraft “Calypso” after the famed oceanographic research ship and its eponymous John Denver song.
caption: "Calypso" in processing after returning to Earth
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