Originally Posted by
ANCIENT
MaybeItIs all Airbus FBW aircraft have a "DUAL INPUT" alert both visual and audio if both side sticks are operated at the same time.
In the case of AF447 the dual input alert went unnoticed. This was primarily because the Airbus design philosophy is very aural alert heavy. When things go bad the alerts simply cancel each other. This has been a problem on other Airbus events.