Originally Posted by
john_tullamarine
There are no guarantees, only probabilities.
Absolutely 100% spot on.
If when something unusual happens (figures plucked out of the air for effect)
the plane is 99.99999% reliable
SOPS are 99.9% reliable
A captain 98 % reliable
A first officer 90% reliable
You are going to get occasions when you lose the aircraft. Fortunately on the rare occasions that the plane gets it wrong one of the pilots has a clue, it should come as no surprise that sometimes both of them don't.