When an F117 pilot complained about vibrations, the flight crew inspected the aircraft, but didn’t find any problems. The pilot ejected safely on September 14, 1996 when vibrations became extreme. Subsequent investigations showed that four of five 1 inch diameter bolts holding a wing to the airplane were missing! A cover plate not removed during inspection concealed the missing bolts. The $42 million dollar plane was destroyed.

source: http://www.assuredquality.com/classic_mistakes.htm tags: Integrity, Mistake