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SpaceX Falcon 9 FT - NROL 76 (classified) - LC-39A

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I read that the issue was a Oxygen Tank Outlet Temperature sensor that was showing readings outside of the allowed range. There is redundancy in those sensors, as in there is more than one, but just to be safe the decision was made to hold the launch and try to replace the sensor in less than a day.

I do not know if that means the F9 has to be stood down and taken back to the HIF or not. It seems to me that 24 hours would not be enough time to do that. So I'm guessing the sensor replacement can be attempted with the rocket on the pad.
 
nrol.jpg

Looks scary
 
This was, by far, the best video of the first stage. Some of those shots were just incredible. Watching the nitrogen jets firing off to adjust course was amazing. There wasn't a single moment where we didn't see what was happening with the booster. The landing video was great but I'll bet we'll see some really epic landing videos showing up for this one.