Brain freeze: hope your airline pilot doesn’t get it

But there is something about airplane crashes that hit a primal chord in a lot of people and it seems to affect me more and more. (I think most of us get more fearful as we age — not one of the more attractive aspects of getting older.) Anyway, this piece is about the Air France crash from a couple of years ago, in which a 747 flying from Rio to Paris seemingly disappeared off the face of the earth. They found the black boxes recently and made a chilling discovery about the cause:

Air France 447 was operating with three pilots: a captain, who was the most senior crewmember, and two co-pilots. At any given time, two of them were required to be in the cockpit, seated at the pair of seats equipped with controls. Four hours into the flight, the captain went to take a nap, leaving the flying of the plane to the more junior of the co-pilots, Pierre-Cédric Bonin. Sitting beside him was the other co-pilot, David Robert.

The crisis began mere minutes later, when the plane flew into clouds roiling up from a large tropical thunderstorm, and the moisture condensed and froze on the plane’s external air-speed sensors. In response, the autopilot disengaged. For a few minutes, the pilots had no way of knowing how fast they were going, and had to fly the plane by hand — something, crucially, that Bonin had no experience doing at that altitude.

The proper thing for Bonin to have done would have been to keep the plane flying level and to have Robert refer to a relevant checklist to sort out their airspeed problems. Instead, neither man consulted a checklist and Bonin pulled back on the controls, causing the airplane to climb and lose airspeed. Soon, he had put the plane into an aerodynamic stall, which means that the wings had lost their ability to generate lift. Even with engines at full power, the Airbus began to plummet toward the ocean.

As the severity of their predicament became more and more apparent, the pilots were unable to reason through the cause of their situation. Despite numerous boldfaced clues to the nature of their problem — including a stall-warning alarm that blared 75 times — they were simply baffled. As Robert put it, after the captain had hurried back to the cockpit, “We’ve totally lost control of the plane. We don’t understand at all… We’ve tried everything.”

Psychologists who study performance under pressure are well aware of the phenomenon of “brain freeze,” the inability of the human mind to engage in complex reasoning in the grip of intense fear. It appears that arousal of the amygdala causes a partial shutdown of the frontal cortex, so that it becomes possible to engage only in instinctive or well-learned behaviour.

In the case of Air France 447, it appears that Bonin, in his panic, completely forgot one of the most basic tenets of flight training: when at risk of a stall, never pull back on the controls. Instead, he held back the controls in a kind of panicked death-grip all the way down to the ocean. Ironically, if he had simply taken his hands away, the plane would have regained speed and started flying again.