Just spoke to an AIRBUS marketing guy at PARIS, when asked about the A305 ( A300 replacement ) he went right to the NTSB discussion - he said that the flight recorder showed the pilot stomped the rudder L-R-L / OR R-L-R - extremely sharply, in succession & exceeded the ultimate design load of the vertical "+10" what ever that means .... "ultimate +10". The NTSB will get to the bottom of this though .. In high-B maneuvers - the angle of attack of the vertical contributes greatly to the loading of the vertical ( IE the vertical is producing alot of lift laterally at high-B ) & aparently - stomping the rudder may have exceeded design limits - seems plausible - after all the poor pilots threw off both engines due to the violent roll-yawing - so I understand ... AIRBUS used an all composite design - whereas stodgy, conservative old Boeing uses "hybrid-composite" - IE metallic & composite retention on super critical areas such as this - so Ive read on the internet .. will be interesting to get the final scoop though ..