Quote:
Originally Posted by gums
The insidious effect of the implementation and the lack of speed/AoA stability until in direct law was a very big player.
Clandestino
Not in AF447 case as it didn't pitch up with neutral stick.
Better tell BEA that they have this analysis wrong then.
Final report page 187,
"However, positive longitudinal static stability on an aeroplane can be useful since it allows the pilot to have a sensory return (via the position of the stick) on the situation of his aeroplane in terms of speed in relation to its point of equilibrium (trim) at constant thrust. Specifically,
the approach to stall on a classic aeroplane is always associated with a more or less pronounced nose-up input. This is not the case on the A330 in alternate law. The specific consequence is that in this control law the aeroplane, placed in a configuration where the thrust is not sufficient to maintain speed on the flight path,
would end up by stalling without any inputs on the sidestick. It appears that this absence of positive static stability could have contributed to the PF not identifying the approach to stall."