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A Closer Look at What Happened to Air France 447

Air France 447 black box BEA
Gemini Sparkle

Key Takeaways:

  • Air France Flight 447 crashed after its autopilot disengaged due to pitot tube discrepancies, leading the pilot to inadvertently stall the aircraft and maintain a nose-up attitude until impact.
  • The accident revealed critical issues with pilot training for fully developed stalls (emphasizing altitude maintenance over nose-down recovery) and flaws in automation design, such as inconsistent stall warnings.
  • The article clarifies that AF447 experienced a stable "mushing glide" rather than a true "deep stall," suggesting that control surfaces remained effective and recovery was likely possible with a nose-down command.
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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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