Starliner Returning to Factory to Resolve Valve Issue

Boeing engineers continue work at the United Launch Alliance Vertical Integration Facility on the Starliner propulsion system valves. (Credit: Boeing)

CAPE CANAVERAL SPACE FORCE STATION, Fla. (Boeing PR) — Today, Boeing informed NASA that the company will destack its CST-100 Starliner from the Atlas V rocket and return the spacecraft to the Commercial Crew and Cargo Processing Facility (C3PF) for deeper-level troubleshooting of four propulsion system valves that remain closed after last Tuesday’s scrubbed launch.

Starliner has sat atop the Atlas V rocket in ULA’s Vertical Integration Facility since August 4, where Boeing teams have worked to restore functionality to the affected valves.

The relocation of the spacecraft to the C3PF will require Boeing, NASA and United Launch Alliance to agree on a new launch date once the valve issue is resolved.

“Mission success in human spaceflight depends on thousands of factors coming together at the right time,” said John Vollmer, vice president and program manager, Boeing’s Commercial Crew Program. “We’ll continue to work the issue from the Starliner factory and have decided to stand down for this launch window to make way for other national priority missions.”

Boeing will continue to provide information and updates at as it becomes available.

Starliner Work in Vertical Integration Facility to Continue Through Weekend

Platforms and scaffolding are up around the Orbital Flight Test-2 Starliner, atop a United Launch Alliance Atlas V rocket, inside the Vertical Integration Facility. (Credit: Boeing)

CAPE CANAVERAL SPACE FORCE STATION, Fla. (Boeing PR) — This weekend, Boeing engineers will continue testing and evaluating the CST-100 Starliner spacecraft inside the Vertical Integration Facility (VIF) at Space Launch Complex-41.

Yesterday, teams powered up the spacecraft to receive data and send commands to the propulsion system valves that unexpectedly indicated “closed” positions early in the launch countdown on Tuesday. The transmitted commands successfully opened some of the valves, giving the team new data to assess while also beginning physical inspections.

“Cautiously optimistic is a good way to describe how the team is feeling,” said John Vollmer, Starliner vice president and program manager. “They’re coming forward with innovative ideas and prioritizing the safety of the spacecraft and their teammates.”

Boeing aims to perform all activities at the VIF before returning to the launch pad for flight. If necessary, the spacecraft could return to the Commercial Crew and Cargo Processing Facility at Kennedy Space Center for further troubleshooting and inspections and possibly return to the pad for launch this month.

Boeing is assessing multiple launch opportunities for Starliner in August and will work with NASA and United Launch Alliance to confirm those dates when the team is ready to proceed with the Orbital Flight Test-2 mission.

Updates will be provided by NASA and Boeing as information is available.

Please follow @NASA, @Commercial_Crew and @BoeingSpace on Twitter, or visit or, for more information.