Just to clear something up with the Lauda Air accident, this is one of the findings from the accident report
Simulations of a 25 percent lift loss resulting from an in-flight deployment of the left engine thrust reverser indicated that recovery from the event was uncontrollable for an unexpecting flight crew.
Boeing had never modelled a thrust reverser deployment at high speed and it was only after extrapolating from low speed testing that any model was input into the simulators. Only by using extreme control inputs within a 4-6 second window could the situation be recovered by Boeing test pilots.
I seem to remember that Nikki Lauda had to put a lot of pressure on Boeing to admit that it was a design fault in the reverser system and not pilot error.