Without speculation where is the shared knowledge, the brainstorming, the "I never in the world would have thought of that", the fodder for some crazy movie? Would not one expect that engineers designing the next generation would be reading all of the speculative ideas which then might enter the FMEAs of the next gen? The master button that will light up indicating the airplane thinks you are doing something stupid, are you sure you want to do this knowing that I (the plane) think your actions may cause a crash? Press here to continue your foolish action for which you assume total responsibility.