We are making a lot of good progress with @SpaceX on engine testing to better understand the unexpected behavior observed during a recent non-NASA launch. (1/5) 
It’s too early to report findings at this point, as @SpaceX continues testing to validate what’s believed to be the most credible cause. (2/5)
Based on our current analysis, @SpaceX is replacing one Merlin engine on the Sentinel-6 Michael Freilich launch vehicle and one engine for Crew-1 rocket that displayed similar early-start behavior during testing. (3/5)
We are still targeting the Sentinel-6 launch for Nov. 10 from Vandenberg Air Force Base as we expect to complete forward work in time. (4/5)
We are also still working towards a mid-November launch for Crew-1. We will want a few days between Sentinel-6 and Crew-1 to complete data reviews and check performance. Most importantly, we will fly all our missions when we are ready. (5/5) #LaunchAmerica
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