CS
22.175 Demonstration of static
longitudinal stability
ED Decision 2003/13/RM
The stick force/speed curve must have a stable slope in the following conditions:
(a) Cruising configuration:
(1) at all speeds between 1.1 VS1 and VNE;
(2) wing-flaps in the position for cruising and for circling flight;
(3) landing gear retracted;
(4) sailplane trimmed at 1.4 VS1 and 2 VS1 (if fitted with a trimming device); and
(5) air brakes retracted.
(b) Approach:
(1) at all speeds between 1.1 VS1 and VFE;
(2) wing-flaps in the landing position;
(3) landing gear extended;
(4) sailplane trimmed at 1.4 VS1 (if fitted with a trimming device); and
(5) air brakes both retracted and extended.
(c) Climb for powered sailplane:
(1) at all speeds between 0.85 VY or 1.05 VS1, whichever is higher, and 1.15 VY.
(2) landing gear retracted;
(3) wing-flaps in the position for climb;
(4) maximum weight;
(5) maximum continuous power; and
(6) sailplane trimmed at VY (if fitted with a trimming device).
(d) Cruise for powered sailplane:
(1) at all speeds between 1.3 VS1 and VNE;
(2) landing gear retracted;
(3) wing-flaps retracted or, in the case of flaps approved for use in en-route flying, in all appropriate positions;
(4) maximum weight,
(5) power for level flight at 0.9 VH; and
(6) sailplane trimmed for level flight (if fitted with a trimming device).
(e) Approach for powered sailplane:
(1) at all speeds between 1.1 VS1 and VFE;
(2) wing-flaps in the landing position;
(3) landing gear extended;
(4) sailplane trimmed at 1.5 VS1 (if fitted with a trimming device);
(5) air brakes both retracted and extended;
(6) engine idling (throttle closed); and
(7) propeller in take-off position.
Sailplane aviation regulations require stable stick force/speed curves during cruise, approach, and climb/cruise (powered sailplanes). This stability must be demonstrated across specified speeds, flap settings, landing gear positions, and trim conditions. Air brake configurations are also considered for approach scenarios, ensuring safe flight handling.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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