> Locking the airplane cockpit door A change which contributed to the complete loss of an aircraft and all aboard when the pilot left to go to the toilet and t

> Locking the airplane cockpit door A change which contributed to the complete loss of an aircraft and all aboard when the pilot left to go to the toilet and the copilot locked the door to crash it into a mountainside. The law of unintended consequences in full effect. Had such a change not been enacted that flight likely would have survived. https://en.wikipedia.org/wiki/Germanwings_Flight_9525 https://en.wikipedia.org/wiki/Germanwings_Flight_9525