ken christianson is with us, investigator and expert. n, judging by -- i'm asking you to speculate. when a cowling comes off, some mechanical weakness, but the fact that the engine is on, it appears the fan blades are all intact. engines redesigned, are they not, to potentially do this if there's some type of failure, for the cowling to separate from the engine and the engine, thankfully, still stays on and they just try to shut it down? >> hi, eric. yeah, the cowling sort of encompasses the engine and provides streamlining, if you will, to the engine. that's -- and then that ring that fell down to the ground, that's the deicing or -- [inaudible] to keep the ice from going into the engine. so that's made to stay on the airplane, but it looked like the whole engine cowling actually left the part of the aircraft. but you can see in the video that was provided that the front of the engine, the fan blades was actually rotating, and it looked like it was in the midst of being shut down. we can see the engine shaking on the pylon, and there was