The Boeing CST-100 Starliner spacecraft is one step closer to its return to Earth following the completion of ground testing for its thrusters. The spacecraft has been in orbit since early June, and Boeing along with NASA were awaiting these tests to begin preparations for its homecoming.
An update released last week confirmed, “Ground testing of a Starliner Reaction Control System (RCS) thruster at the White Sands Test Facility in New Mexico is complete, and teams are now turning their attention to data reviews.” The purpose of the tests was to analyze thruster performance and understand the reasons behind the in-flight de-selection of some thrusters, as well as the potential impacts of reintegrating them.
Officials noted that “de-selected” refers to thrusters that failed to function. The helium tanks that control these thrusters experienced leaks prior to and during the launch, which contributed to several delays. Last month, NASA officials stated that the spacecraft contained 70 hours of helium, although it only needs seven hours for its operation. They mentioned that while it could be brought back now if necessary, they are not fully prepared for that outcome just yet.
Previously, NASA and Boeing indicated that a return flight could occur at the end of this month. However, the timeframe is now more flexible, with the focus shifting to thruster disassembly, inspections, and finalizing preparations for Starliner’s safe return to Earth, carrying commander Butch Wilmore and pilot Suni Williams in the coming weeks.