Why users and robots need to team up

In 2009 an Airbus plane took from Paris Airport to Brazil. Everything was going well in the take-off and the plane took cruising speed. Yet, as passengers could again get up, ice crystals formed on the airspeed sensors that undermine their operation. Faced with such a situation, the plane automatically went into an alternative emergency mode, where the pilots have to control the plane manually. The problem was that this change was not well indicated, and so pilots didn't notice it.