Mission teams are now examining the cause of indications on Starliner’s propulsion system of an “unexpected valve position”.
The reusable crew capsule, in development for over a decade, has been designed to transport crew to the ISS and other low-Earth-orbit destinations.
Alongside Nasa teams, Boeing worked through several steps to try and troubleshoot the problem, but was ultimately forced to call off the launch at Cape Canaveral Space Force Station in Florida.
Engineering teams have already ruled out a number of potential causes, including software, but additional time is needed to complete the assessment, Nasa said.
The teams plan to take whatever time is necessary to ensure Starliner is ready for its uncrewed flight test to the space station and will look for the next available opportunity for launch after it has resolved the issue.
“Additional time is needed to complete the assessment,” Boeing said in a statement, adding that the next potential...