According to a NASA press release today, Boeing has decided to swap Starliner service modules for the capsule’s first two missions, using the service module intended for the first manned flight on the unmanned demo flight, and assigning the service module for the unmanned demo flight — which had the valve issue — to the first manned flight.
The launch schedule for these two flights is now targeting May for the unmanned demo flight and August for the first manned Starliner demo mission.
Ongoing investigation efforts continue to validate the most probable cause to be related to oxidizer and moisture interactions. NASA and Boeing will continue the analysis and testing of the initial service module on which the issue was identified leading up to launch of the uncrewed OFT-2 mission in August 2021.
In other words, though they are claiming that they have figured out the sticky valve problem in that service module, it is also quite likely that it will not be used in August 2021. I suspect they will eventually put it aside and use another service module for the manned mission, and have only said now that they will use it on the manned mission for PR reasons. It appears they are confident the valve issue is solved for other service modules, but are not yet satisfied this troublesome service module is trustworthy.
The May-August schedule is tight, but doable, assuming the May unmanned flight goes well. If the August manned demo mission also goes well, Boeing will finally be able to begin selling seats on its Starliner capsule, though I would not be surprised if it makes no sales to anyone but NASA for the next few years. Considering its problem-filled development, private users are going to be reluctant to use this capsule until it establishes a successful track record.
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