Speck in the Windshield
A safe flight is a puzzle. Put all the pieces together correctly and you can get a pretty picture indeed. If one piece is missing, you can still see the picture, usually. But sometimes, if the wrong piece is missing, the puzzle is ruined. Unfortunately, when a piece is missing from the safety of flight, the price is higher than merely sighing and putting the puzzle box back in the closet.
Pilots love to talk about accident scenarios in terms of chains. Break one link and the chain fails, sending all of the airplanes occupants home to have dinner with their loved ones. Its a nice story. It has closure and finality. Its also a myth.
An accident can also be caused by something as smal…