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It does: there's an audible warning that says the words "DUAL INPUT"

The English translation of the BEA's third interim report on the flight is available here: http://www.bea.aero/docspa/2009/f-cp090601e3.en/pdf/f-cp0906...

It includes the full CVR transcript at the end, which shows that the dual input alarm activated five times.

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I think that part of the problem here is that the plane is so far out of trim and CRM has gone completely out of the window that psychologically at least the mental workload on the junior pilot has caused him to "freeze".

Far worse, imaging a situation where one of the control inputs fails; i.e. constantly produces nose up input. Can one of the inputs be suspended / turned off?

Then link the sticks mechanically.

Still, if the panicky guy is unconsciously trying to out-muscle you, well, then you reach over and punch him in the face.

If even that fails... uh... I guess you're in deep deep doo-doo at that point.

... so if there was a noise (intercom, radio, talking etc) and you didn't hear the announcement, that's it ,game over.

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