![]() ![]() My own years in Mission Control told me that he wasn't. So when Cain was suggesting it might be safe enough to decide that only two working sensors might be adequate, was he lowering the level of safety? To permit the launch to proceed, NASA currently requires that three of the four fuel tank sensors be operational. ![]() If either the oxygen or the hydrogen feed stops while the other feed continues, the fire in the engines can go disastrously out of control. ![]() Under certain conditions, if those sensors don’t accurately report that the tank is running empty, there could be disastrous consequences to the shuttle and its crew. On a spaceflight, it can mean death.ĭuring Thursday’s aborted countdown, two of the four fluid sensors in the shuttle’s main hydrogen tank indicated that they would report "wet" - that is, "not yet empty" - even if the tank actually went dry. Back on Earth, when driving cross-country, a gas gauge that reads "nearly empty" when the tank actually runs dry leaves you stranded and embarrassed. ![]()
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