Failure %

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The FAA requires something like 10^-9 per flight hour probability (that's like 1 in a billion chance) for anything that would result in a
catastrophic outcome (ie. crash) eg. loss of ALL engines, hydraulics, or electrics. That's why those systems have duplicate components,
so that the failure of any one or two systems will not bring down the aircraft. In fact, by FAA rules, an aircraft at max takeoff weight must be
able to suffer one complete engine failure just after V1 and still make it safely into the air.

Gary