http://www.nytimes.com/2004/10/12/nyregion/12crash.html?oref=login&pagewanted=print&position=An airplane manufacturer's memo written in June 1997 explicitly describes the hazards of the maneuver that caused the November 2001 crash of an American Airlines plane in Belle Harbor, Queens, but the memo was kept within the company, and the pilot was never warned about the procedure.
American Airlines obtained the memo a few months ago from the manufacturer, Airbus, as part of its suit over how the companies will share the payments to the families of the 265 people killed in the crash of Flight 587. The memo is now being cited by American and the pilots' union in an effort to put part of the blame on Airbus.
The maneuver involved swinging the rudder from side to side, and the memo, written after a 1997 episode with a different American Airlines flight in the same kind of plane, an A300, warns that it could cause the tail to break off. That is what happened to Flight 587.
After the crash, the National Transportation Safety Board issued a recommendation against the maneuver. If Airbus had shown the memo to the board before the crash, "instead of concealing it from them, the N.T.S.B. would have issued the recommendation before the crash," said John A. David, an American Airlines pilot who is the chief representative of the union, the Air Line Pilots Association, in the investigation.
I hope our DU pilots chime in on this - to this layperson this sounds like a FU'ed design flaw.