Ive watch every mayday episode and tons of crashes are caused by like a simple screw being put back wrong after maintenance, how the hell do all these planes get good enough inspections done even fly several hours without failing and falling out of the sky?
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Airplane regulations are written in blood. Whenever there is an accident it gets investigated to find all the events leading up to the accident and then these are all fixed so that similar issues will not happen in the future. And even lots of mishaps that did not cause any accidents gets reported and investigated in a similar manner. One of the reasons why there are so many pieces and wires all over the airplane is that all of the critical systems have multiple redundant systems. So even two failures in separate systems should not cause anything bad to happen. But this means that you have a lot of systems installed on the aircraft all at once. Another concept is that everything is made as simple as possible. This means fewer failures. There are limits to how simple you can make systems on large modern airliners but they could have made them much simpler. So where you for example in a car have a few big computers controlling everything an airliner is mostly mechanical systems and independent smaller computers. But that also increase the parts count a lot.
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