CS 22.207  Stall warning

CAA ORS9 Decision No. 1

(a) Except as provided by 22.207(d), there must be a clear and distinctive stall warning with air brakes, wing-flaps and landing gear in any normal position, both in straight and in turning flight. In the case of a powered sailplane compliance with this requirement must also be shown with the engine running in the conditions prescribed in CS 22.201(f)(5). 

(b) The stall warning may be furnished either through the inherent aerodynamic qualities of the sailplane (e.g. buffeting) or by a device that will give clearly distinguishable indications.

(c) The stall warning must begin: 

(1) at a speed between 1.05 V_S1 and 1.1 V_S1, or 

(2) between 2 and 5 seconds before the stall occurs when longitudinal control is moved at a pace corresponding to approximately 2 km/h per second rate of reduction of speed and must continue until the stall occurs. 

(d) Compliance with 22.207(a) through (c) is not required for a sailplane, a self-launching powered sailplane with the engine stopped, or a self-sustaining powered sailplane with the engine stopped or running if the following are met with air brakes, wing-flaps and landing gear in any normal position: 

(1) recovery from a stall is prompt in both straight and turning flight; 

(2) when a stall occurs from straight flight: 

(i) it is possible to produce and correct roll by using the ailerons, the rudder being held neutral; and 

(ii) no appreciable wingdropping occurs when both ailerons and rudder are held

natural; 

(3) when a stall occurs in a coordinated 45° banked turn, any subsequent rolling or yawing motion is not rapid and is readily controllable.