Unreliable airspeed drill or Stall recovery ?
AF 447 had stall warnings and unreliable airspeed indications simultaneously.
The A-330 unreliable airspeed drill in clean configuration at cruise flight level calls for the pitch to be set at 5 degrees nose up and for thrust to be set at CLB (which in effect puts the aircraft in a climb configuration)
The Stall recovery drill calls for nose down pitch control with thrust to be increased smoothly once out of the stall.
Because the auto thrust disconnected, if the pilots did not move the thrust levers, the thrusts would have gone to CLB on their own (A-330 thrust levers are set t CLB detent when in cruise on auto-thrust). The pilot's initial reaction was to bring the pitch up to 10 degrees nose up.
49 seconds after the start of the incident, after another stall warning, the pilot pushed the thrust levers from CLB to TOGA.
May 30 EDIT:
When the Autothrust disconnects due to a fault rather than by pilot action, the thrusts do not go to match the Thrust Level Symbols (blue doughnuts) as in the manual disconnect, but freeze in their present position.
Last edited by Minorite invisible; 30th May 2011 at 13:54.