fgrieu -- note that the expert is said to be an ex-airbus pilot. When listening to the testimony of experts who have had previous links with manufacturers or employers, one should be sure to check that there is no axe to grind. Even a small chip on a shoulder can cause a man to walk with a pronounced limp. Demanding the entire fleet to be grounded until the phenomenon is 'adequately explained' (to whom?) is a serious step that could financially cripple or even destroy the manufacturers, airlines and their employees.