Severe turbulence caused chaos on a United 767 yesterday. The plane departed from Washington, D.C. enroute to Los Angeles cruising at 34,000 ft when it encountered severe turbulence. The turbulence lasted for several seconds, but 25 of the 265 passengers were injured. Those that were injured didn't have their seat belts on. Some passengers described the turbulence encounter as being in an elevator that just dropped down the elevator shaft hit bottom, and came back up. This is exactly how I remember my encounter with clear air turbulence over ten years ago.The turbulence caused a small crack in the window area, but the aircraft integrity remained intact. To learn more on clear air turbulence I enclosed a video below.
http://www.youtube.com/watch?v=7Gao3SIT3IY