Enlarge / Boeing's Starliner spacecraft on final approach to the International Space Station last month. (credit: NASA)
Before clearing Boeing's Starliner crew capsule to depart the International Space Station and head for Earth, NASA managers want to ensure the spacecraft's problematic control thrusters can help guide the ship's two-person crew home.
The two astronauts who launched June 5 on the Starliner spacecraft's first crew test flight agree with the managers, although they said Wednesday that they're comfortable with flying the capsule back to Earth if there's any emergency that might require evacuation of the space station.
NASA astronauts Butch Wilmore and Suni Williams were supposed to return to Earth weeks ago, but managers are keeping them at the station as engineers continue probing thruster problems and helium leaks that have plagued the mission since its launch.
