where a very specific set of circumstances defeats the design. That it took some 13 years for that edge case to be found implies that the design and implementation was pretty damned thorough.
@DozyWannabe,
Any comment on the 50% reduction of aileron authority once one wheel touches the ground during landing?
"The BFU stated, that at the time of flare and touchdown there was no significant gust. The weather situation was well within the forecasts.
The flight control laws of the Airbus Fly By Wire (FBW) change from flight mode via flare mode to ground mode in the pitch axis and change directly from flight mode to ground mode in the roll control. In ground mode the side stick deflection lead to a direct proportional deflection of ailerons and roll spoilers without computer interaction.
However, above 80 knots the effectiveness of roll control, ailerons and roll spoilers, is reduced by the half (e.g. aileron deflection limited to 50% of maximum deflection).
When the left hand main gear contacted the ground, the radar altimeter indicating less than 50 feet AGL, both landing gear control interface units detecting weight on the left hand wheel, the airplane changed from flight to ground mode, confirmed by Airbus, the effectiveness of the roll control reduced by 50 percent at that point.
.....The airplane subsequently touched down with the left hand main gear at a roll angle of 4 degrees to the left and got airborne again. The roll angle increased to 23 degrees to the left, first officer and captain each now pushing their side sticks full right,"
Report: Lufthansa A320 at Hamburg on Mar 1st 2008, wing touches runway in cross wind landing