[QUOTE=lomapaseo;10078600]Well they are like aircraft components such as keel beams and wing spars sized and life limited to not fail and if the(engine) do fail the aircraft design need to provide mitigation against the loss of the aircraft from such uncontained consequences
I do not believe that is the case. Aircraft structure is designed to fail safe principles with dual load paths and so on and safe lives in the rotating part sense are not used. The integrity philosophy of engine rotating parts is in no way similar to aircraft structural disciplines. A good thing, too.
And don't get me started on rotorcraft.