I suppose I opened a bit of a hornets' nest with my comments regarding RF communications by AF447.
I'm a radio amateur and not a radio professional so my observations are based on empiricism but I believe that electromagnetic propagation is still a poorly understood science (not only by me) and at times will not conform to engineering specifications.
My object was to point out the perversity of inanimate objects such as non-vacuum electromagnetic propagation media (and in previous comments - computer software) as observed by Major Edward Murphy and published by his colleague Col. John Strapp M.D. who understood the medical maxim: never say that something never happens or that something always happens. This applies to all professional endeavours.
AF447 foundered is spite of the collective wisdom of all who created and operated her.