Originally Posted by
dera
Well, yes and no. That safety factor (or as they say, extremely improbable) is used for failures where the result is catastrophic. Pilot incapacity in a two-pilot plane is not a catastrophic event, and thus does not need to be certified to that standard.
All redundant systems, taken together, get factored into the total. I imagine that would include pilots, have no idea how they calculate it.
General population health stats?
Stats on inflight pilot incap?
Actually I don't think I've ever heard of a dual pilot medical incap in an airliner, ever. Maybe they just assume that since it's never happened, the odds are low enough to be well below the certification threshold so as to be statistically insignificant. Ignore it in other words.
Although they have to use some kind of math when they make changes to pilot medical certification policy. If nothing else to justify on paper whatever wild idea they pulled out of their butt.