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takyon writes:

Due to delays and potential delays in launching crew to the International Space Station (ISS) using American-made spacecraft, NASA is prepared to purchase two more seats to the ISS from Russia's Roscosmos:

Despite the scheduled return of US domestic crew launch capability this year, NASA is set to purchase more rides on the Russian Soyuz through 2020. The agency is adhering to a recommendation from its Aerospace Safety Advisory Panel (ASAP) after concerns were raised about the lack of a back-up option covering the potential delays that could be suffered during a challenging test flight phase for Dragon 2 and Starliner.

[...] "Past experience has shown the difficulties associated with achieving first flights on time in the final year of development. Typically, problems will be discovered during these test flights. The consequences of no US crew on ISS warrant protection by acquiring additional seats. The absence of U.S. crewmembers at any point would diminish ISS operations to an inoperable state," noted a procurement document published on February 13. "NASA is considering contracting with the State Space Corporation "Roscosmos" for these services on a sole source basis for two (2) Soyuz seats and associated services to the International Space Station (ISS) on the Russian Soyuz spacecraft vehicle. This transportation would be for one crewmember in the Fall of 2019 and one crewmember in the Spring of 2020."

The two seats in Fall 2019 and Spring 2020 seem to be in reference to the Soyuz MS-15 and MS-16 flights. Soyuz MS-15 currently has its third seat occupied by a paying spaceflight participant – who will now likely be bumped to accommodate a permanent US Station crewmember – and Soyuz MS-16 is a schedule two-person flight with a vacant third seat available.

While the action does not point to an increase in uncertainty over the progress being made by Commercial Crew providers, it does cite the wish to avoid placing schedule pressure on the companies, an issue that still haunts NASA after it was determined to have played a direct role in the loss of Shuttle Challenger in 1986.

Also at Space News and Ars Technica.

Previously: Boeing Crewed Test Flight to the ISS May be Upgraded to a Full Mission
SpaceX and Boeing Not Ready to Transport Astronauts to the International Space Station
SpaceX, Boeing (and NASA) Push Back 1st Test Launches of Private Spaceships

Related: NASA Confident in Soyuz, Ready for Crewed Launch in December

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