Unreliable speed is one of the difficult situations that a pilot has to face. Once the failure has been identified, a procedure, based on pitch angles and thrust settings, will assist the pilot in safely flying the aircraft... ...the main difficulty is to rapidly detect an unreliable speed situation. Reaction time is crucial, since the aircraft may stall and overspeed conditions could cause aircraft damage. ...‘We’ were already aware of what the problem was the morning of the accident (the famous erroneous airspeed). There are passed records that display the exact ACRAS messages sent by the AF477. The same causes...