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It was an utter mystery. No other airliner had vanished so completely in modern times. Even when wreckage was discovered the tragedy was no less perplexing. The aircraft had flown through a thunderstorm, but there was no distress signal, and the jet was state-of-the-art, a type that had never before been involved in a fatal accident. What had caused it to fall out of the sky?


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The official report by French accident investigators is due in a month and seems likely to echo provisional verdicts suggesting human error. It will be a grievous blow for Air France, perhaps more damaging than the Concorde disaster of July But there is another, worrying implication that the Telegraph can disclose for the first time: that the errors committed by the pilot doing the flying were not corrected by his more experienced colleagues because they did not know he was behaving in a manner bound to induce a stall.

Anything to do with Airbus is important. The company has sold 11, aircraft to date, with 7, in the air.


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  4. It commands half the world market in big airliners, the other half belonging to its great American rival, Boeing. The mystery of AF has taken three years to resolve, involving immensely costly mid-Atlantic searches covering 17, square kilometres of often uncharted sea bed to depths of 4, metres. So remote was the place the airliner went down, in equatorial waters between Brazil and Africa, that it was five days before debris and the first bodies were recovered.

    Pilots' reliance on technology questioned. Final words of Air France passenger jet emerge: 'what's happening? Air France Flight a history of flight recorders. How to survive a plane crash. Air France crash dropped 10, feet a minute. The final moments of Air France flight AF On entering the storm these had apparently frozen over, blanking airspeed indicators and causing the autopilot to disengage. From then on the crew failed to maintain sufficient speed, resulting in a stall which, over almost four minutes, sent people plummeting to their deaths.

    But why?

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    Normally an A can fly itself, overriding unsafe commands. Even if systems fail there is standard procedure to fall back on: if you set engine thrust to 85 per cent and pitch the nose five degrees above the horizontal, the aircraft will more or less fly level.

    Loss of Control - SKYbrary Aviation Safety

    How was it that three pilots trained by a safe and prestigious airline could so disastrously lose control? Either there was something wrong with the plane, or with the crew. Airbus and Air France, both with much to lose, were soon pointing accusing fingers at each other.

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    For Air France the conclusion was crushing: the crew had ignored repeated stall alerts and kept trying to climb, instead of levelling off or descending to pick up speed. The A had become so slow that it simply ceased to fly. Its reputation on the line, Air France came as close as it dared to repudiating the finding. All indications suggested the aircraft had functioned just as it was designed. The black box recordings showed that the plane was responsive to the point of impact.

    The case against the pilots looked even worse when a transcript of the voice recorder was leaked. It confirmed that one of the pilots had pulled the stick back and kept it there for almost the entirety of the emergency. With its nose pointed too far upwards, it was little wonder that the Airbus had eventually lost momentum and stalled.

    But this analysis begs the question: even if one pilot got things badly wrong, why did his two colleagues fail to spot the problem? The transcript of increasingly panicky conversations in the cockpit suggests they did, but too late. AF was four hours into its hour overnight journey when it was overwhelmed by disaster. Many passengers, including five Britons, would have been trying to grab some sleep, only half aware of the turbulence buffeting the A Also travelling was Christine Badre Schnabl and her five-year-old son, Philippe.

    She and her husband had purposely chosen separate flights to Paris, possibly because of their shared fear of air crashes. Two hours in, Marc Dubois, the veteran captain, was heading for a routine break. His deputy, David Robert, a seasoned flier with 6, flying hours under his belt, was perfectly capable of coping with the tropical thunderstorm AF was flying towards. As the airliner entered the worst of the weather, Bonin told the cabin crew to prepare for turbulence.

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    Eight minutes later, everyone on board would be dead. Bonin himself seems to have been spooked, calling attention to a metallic smell and an eerie glow in the cockpit. That is why we created Download Your Data — so you can make a copy, back it up, or even move it to another service. You can manage personal information like your name, email, and phone number to help others find and contact you on Google services like Hangouts, Gmail, and Photos. In Ad Settings, we make it easy to control what data we use to personalize ads to you. Your online history can help make your search results more useful, but there are times you may want to browse in private.

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    Take your Privacy Checkup. Go to Activity Controls. When a servo tab is employed, it is moved into the slipstream opposite to the control surface's desired deflection. For example, in order to trim an elevator to hold the nose down, the elevator's trim tab will actually rise up into the slipstream. The increased pressure on top of the trim tab surface caused by raising it will then deflect the entire elevator slab down slightly, causing the tail to rise and the aircraft's nose to move down.

    The use of trim tabs significantly reduces pilots' workload during continuous maneuvers e. Both elevator trim and pitch trim affect the small trimming part of the elevator on jet airliners. The former is supposed to be set in a certain position for a longer time, while the pitch trim controlled with the landing pilot's thumb on the yoke or joystick, and is thereby easy to maneuver is used all the time after the flying pilot has disabled the autopilot, especially after each time the flaps are lowered or at every change in the airspeed, at the descent, approach and final.

    Elevator trim is most used for controlling the attitude at cruising by the autopilot. Beyond reducing pilot workload, proper trim also increases fuel efficiency by reducing drag. For example, propeller aircraft have a tendency to yaw when operating at high power, for instance when climbing; this increases parasitic drag because the craft is not flying straight into the apparent wind. In such circumstances, the use of an adjustable rudder trim tab can reduce yaw. On military aircraft during wartime, trim tabs often served as unintentional backup control systems for aircraft with damaged controls.

    Such control is effective, if slower and more limited than primary controls, but it does allow the aircraft to be controlled and directed. In other cases, such as engine failure or damage causing asymmetric drag, trim tabs were invaluable for allowing the pilot to fly the aircraft straight without having to apply a constant force on the stick or rudder to keep the aircraft flying straight.

    Trim tabs were also important for aircraft such as bombers, which often underwent rapid changes in center-of-gravity when the bombload was dropped, requiring a hand ready on the trim-adjusting wheel to counteract the tendency of the aircraft to pitch up or down. Undertaking high-speed dives or deploying flaps also generally necessitated pitch trim adjustment, as aircraft of the era had different pitch tendencies at different airspeeds, and flaps could change the center of pressure.

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    Even consumption of fuel could require periodic trim adjustment during a long flight, as it was difficult to ensure that all fuel tanks were equally near the center of gravity. An extreme example was the later P Mustang, which was given a large fuel tank behind the cockpit to allow long-range missions; as fuel from this tank was consumed it was necessary for regular adjustment of the elevator trim.

    Designer Buckminster Fuller is often cited for his use of trim tabs as a metaphor for leadership and personal empowerment. In the February issue of Playboy , Fuller said:. Something hit me very hard once, thinking about what one little man could do. Think of the Queen Mary —the whole ship goes by and then comes the rudder. And there's a tiny thing at the edge of the rudder called a trim tab. It's a miniature rudder. Just moving the little trim tab builds a low pressure that pulls the rudder around. Takes almost no effort at all.