Over the summer, while Williams and Wilmore began their now eight-month stay, Boeing began investigating Starliner's issues by firing test thrusters at its White Sands facility in New Mexico.
In the end, Boeing’s refusal to perform an in-flight test of Starliner’s abort system—thrusters designed to propel the vehicle away if the rocket malfunctions during launch—became a ...
June’s flight was meant to be Starliner’s final test to put Boeing on par with its SpaceX ... with several thrusters experiencing issues as Starliner docked.