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A Closer Look at What Happened to Air France 447

Air France 447 black box BEA
Gemini Sparkle

Key Takeaways:

  • The Air France 447 crash was primarily caused by the pilot stalling the aircraft and maintaining a nose-up input after autopilot disengagement, an action contrary to standard stall recovery procedures.
  • The incident exposed critical flaws in transport pilot training for stall recovery, which prioritized increasing power over pitching down, and highlighted confusing automation behavior such as an intermittent stall warning.
  • The article clarifies the actual mechanics of an aircraft stall, explaining that a stalled wing still generates lift and AF447 experienced a "mushing glide" rather than a sudden "plunge," while also refining the technical definition of a "deep stall."
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(August 2011) After the nearly miraculous** retrieval of the black boxes** from Air France Flight 447, the Airbus A330 that disappeared in the mid-Atlantic in May 2009 with 228 souls aboard, it quickly became apparent that the events that led to the crash, until then magnified by the lens of mystery — a monster storm? a freak structural failure? a runaway computer? — had been quite mundane. Basically, what happened was that the autopilot had turned control of the airplane over to the pilot, who first stalled it and then held the stick back for almost three minutes while descending at more than 10,000 fpm to the ocean.

That a discrepancy among the airplane’s three pitot tubes had caused the autopilot and autothrottles to disengage was already suspected from maintenance-related messages robotically transmitted by the airplane’s computers before the crash. The recovered black boxes, their data intact, told a good deal more. The airplane had rolled to the right; the pilot leveled the wings and, in a simultaneous and possibly inadvertent motion of the A330’s quite sensitive sidestick, pulled the airplane up into a 7,000 fpm zoom climb from 35,000 to 38,000 feet. There, as the jet was momentarily in level flight with decaying airspeed and the nose above the horizon, the stall warning sounded.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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