NASA's Return to Flight Mission July 13!

[sanddrag]

Originally Posted by cdr1122334455

But then again they only need 2 of the 4 to work.

But they aren't going to launch even if just one of them gives a strange reading. If they lose one, that means they only have one backup. They are not going to take the risk. In the previously scheduled launch, they could have even lost a second one and still launched but they didn't. NASA knows what they are doing with safety and they aren't going to take any chances just to get it up in the air. Everyone wants to see it go up, but no one wants to see it go up and fail, or go up and not return home.