NASA to roll back its mega rocket after failing to complete countdown test | Ars Technica - by SciGuySpace
After three attempts to complete a critical fueling test of the Space Launch System rocket, NASA has decided to take a break.
While this represents progress, it did not include the most dynamic portion of the test, during which the rocket is fully fueled and pressurized; and it, the ground systems, and computer systems are put into a terminal countdown when every variable is closely monitored.
NASA will then have to make some difficult decisions. It could opt to roll the rocket and its mobile launch tower to the pad a second time and try again to complete the wet dress rehearsal test. Then, following its normal procedure, NASA would roll the rocket back to its assembly building to arm the"flight safety system," before rolling for a third time to the launch pad for liftoff.
In other words, this means the wet dress test would have to be nearly flawless, and then the launch attempt would need to be flawless as well. It would also mean that summertime weather in Florida—when there are numerous thunderstorms and other inclement conditions—would have to cooperate.
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