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Old 26th January 2009 | 09:33
  #514 (permalink)  
atakacs
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Joined: Jun 2002
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From: Geneva, Switzerland
There has already been accidents due to this type of mistake and all were Boeings are far as I can remember. The aircraft could not be manually controlled due to erroneous air data readings.
Actually there was an A300 in Kenya (?) which crashed at takeoff because of erroneous stall warnings to the crew (although the exact cause of those bogus warnings where not established it was definitely sensor or computer related).
That being said most if not all "bad sensor" induced crashes where during night operation, in which case getting inexact readings from some or most instruments is obviously quite challenging (albeit survivable in most cases with the benefit of hindsight). Here they were flying with reasonably good visibility yet they still lost the aircraft. I can certainly foresee surprise and panic when the Bus decides to do something unexpected (this time because of possibly paint damaged sensors) but I am still convinced that there is no adequate takeover procedure for the pilot to regain control when things get out of hand. One can mention the A330 test flight that went bad and where the chief test pilot did not manage to recover in time because (among other factor, admittedly) he did not understand what the plane was doing or the TAM 320 where the crew was refused any kind of braking because the automation systems did not like what the pilot was doing. In both (and other cases) the pilots might have had a chance if they could quickly revert to a fully human controlled flight. I'm pretty sure this will be the case here too...

One might argue that the various automation built into the Airbus FWB systems did actually save the day more often than not by overriding the pilot and it is quite conceivably the case. But I would still be more reassured if there would be a quick way to get back full control of the plane and if the FWB pilots would be actually trained to take over when they don't understand what's going on (just remember the Flash Airline pilot whose only answer to increasing excessive bank angle was to revert to the autopilot... it was a 737 but it's NOT the attitude to have).
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