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 and powered sailplane longitudinal stability requires a stable stick force/speed curve. This must be demonstrated in cruising, approach, and climb configurations, considering various speeds, flap settings, landing gear positions, air brake configurations, power settings, and trim conditions to ensure safe flight characteristics.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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