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Officials scrubbed the planned launch of a Boeing-built crew capsule Tuesday to examine a potential technical issue in the spacecraft’s propulsion system, delaying the start of a critical unpiloted test flight to prove the ship is ready to ferry astronauts to the International Space Station.

An Atlas 5 rocket was hauled back to its seaside firing stand Monday for launch Tuesday on a flight to boost Boeing’s Starliner crew capsule into orbit for a second unpiloted test to prove the commercial ferry ship is ready to carry astronauts.

Playing it safe, the seven-member crew of the International Space Station moved into the U.S. segment of the outpost Friday, closed hatches and window shutters and stood by while Russian flight controllers vented helium pressurization lines in the newly arrived Nauka lab module.