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They now plan the first unmanned test flight around the end of this year, with the first manned flight in the middle of 2019.
As for the fuel leak,
several abort engine valves failed to close properly, causing a leak of toxic fuels. The test article was not damaged and no one was hurt, but the incident required an investigation with support from NASA.
Other reports say that 4 of 8 valves failed to close. There is no explanation about why this happened, but I find it a very strange technical failure. Building valves for spacecraft is not cutting edge design, or I wouldn’t think so.
Tomorrow NASA administrator Jim Bridenstine is going to make an announcement with some official launch dates for both Boeing and SpaceX. We shall see if SpaceX’s schedule gets pushed back as well.