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...that's not what happened when one of them went awry on Oct. 7 and began sending erroneous data spikes on the plane's angle of attack (AOA) - the angle between its wings and the air flowing over them - to the flight-control computer. "For some reason, the damn computer disregarded the healthy channels," says Hans Weber, an aviation expert who heads Tecop International, an aviation-consulting firm in San Diego. "Instead, it acted upon the information from the rogue channel." The computer, responding to the faulty data, put the plane into a dive. (Read "Is There a Cause...
...same thing happened again, involving a different aircraft, on Dec. 27, Airbus combed its computerized flight files and found data fingerprints suggesting similar ADIRU problems had occurred on a total of four flights. One of the earlier instances, in fact, included a September 2006 event on the same plane that entered the uncommanded dive in October (the other three flights had continued safely on). The same VCR-sized ADIRU was to blame in both those cases, although it had supposedly undergone a needed realignment following the 2006 event. All three planes carried the same brand and model of ADIRU...
...known whether Air France 447, an A330, carried the troublesome variety of ADIRU. But if it did, and if the Air France plane plummeted into an uncommanded dive while traveling through a downdraft generated by storms - a common occurrence over the region of the Atlantic Ocean where the plane went down - it could have been doomed as it entered a steep dive and likely broke...
...these fly-by-wire systems, one never really knows if one has checked out all possible combinations of events to make sure that the computer properly reacts," Weber says of modern flight control. Fly-by-wire systems use computers and wires instead of mechanics and hydraulics to control a plane's flight. Electronic systems are more reliable than mechanical processes but are prone to software errors that can't always be anticipated. "There could be some other sequence of events that could cause another bad software reaction," says Weber...
...Australians' March report concluded that the October dive was due to a series of events that, when combined, was "close to the worst possible scenario that could arise from the design limitation in the AOA processing algorithm." Airbus also told investigators that this particular mathematical formula for flying the plane is found only on its A330 and A340 models. "Different algorithms were in use on other Airbus types, which were reported to be more robust to AOA spikes," the report said. "The manufacturer advised that AOA spikes matching the above scenario would not have caused a pitch-down event...