Fort Knox

This is the over-center wing box, a piece of the plane's skin that is meant to handle loads for the wing. It is heat bonded and heat treated, and thicker than the rest of the plane's skin. It is called "Fort Knox" because it is the strongest piece of the aircraft.

February 12, 2011 1:15 PM PST

Photo by: Daniel Terdiman/CNET

| Caption by: Daniel Terdiman

 

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