PPRuNe Forums - View Single Post - AF 447 Thread No. 5
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Old 26th July 2011 | 22:47
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DJ77
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Joined: Jun 2009
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From: France
Originally Posted by gums
Give me a 'bus and I believe I can duplicate the scenario easily.
Not so sure you could.

I think the scenario you describe explains why the “bus” FBW computers calculate a “phase advanced AoA” as mentioned in the A340 zoom climb incident report. Remember the bus has a pitch attitude protection (IIRC: 30 deg NU progressively reduced to 25 deg at low speed). With that limitation and factoring pitch inertial moment and tail effectiveness it must be relatively easy to anticipate and prevent the AoA to become greater than alpha prot. Of course, this works only in normal law.
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