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According to CS 25.207 (c), stall warning must begin:
  • A
    at the stalling speed plus five percent CAS.
  • B
    at a speed (VSW) exceeding the speed at which the stall is identified by not less than five knots or five percent CAS, whichever is greater.
  • C
    at a speed (VSW) which is five knots or five percent CAS lower than the speed at which the stall is identified, whichever is lower.
  • D
    at the stalling speed plus five knots.
On a large transport airplane and according to the CS25, when the airspeed is becoming increasingly lower, the stall warning must begin at a speed exceeding the stall speed by not less than 5kt or 5% CAS, whichever is greater. This is because the stall warning system needs to generate the alarm with sufficient margins in order to prevent inadvertent stalling with the flaps and landing gear in any normal position. The stall warning will typically consist of an aural warning with a voice warning such as ‘STALL, STALL’, and a stick shaker connected to the control column. Caution! The stall warning is only alerting the pilot that the aircraft has entered a stall while the stick pusher is a protection – it acts on the control column to prevent the aircraft from entering the stall conditions.
The input data of the stall warning system are:
  • Angle of attack
  • Configuration (slats/flaps deflection)
Note:
The stall warning is inhibited while on the ground.

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