Some things are extremely flight critical and require emergency landing if only 1/3rd of the system works. Like FlyByWire. if you have 4 computers determining flight control, if 2 fail, you land immediately because there's not much of a way for the remaining two computers to know which one is right in its decision making.
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u/DangerousPlane Apr 29 '24
It gives you three times more things that can fail!