PPRuNe Forums - View Single Post - AF447 Thread No. 3
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Old 31st May 2011, 15:38
  #872 (permalink)  
bearfoil
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takata

ami. "...AP, ATHR, flags on PFD, etc. all disconnected at 0210:05 due to unreliable airspeed processed by the PRIMs (Flight control computers)... this is the root cause of everything. The system switched to ALTERNATE LAW (PROT LOST) at this point because two or three pitots displayed a variation of airspeed above 30 Kt during one second. As this event lasted more than 10 seconds, ALTERNATE LAW would be definitive until the end of the flight, but autopilot and autothrust could have been re-engaged later if two calculated airspeed would be considered valid again by the PRIMs.

There is absolutely zero doubt that this is why AP went off..."

Everything never happens at once. If that were so, there would be no time. What happened prior to 2h10m05s to cause "..all disconnected at 2h10m05s?"