CS 22.175 Demonstration of static longitudinal stability

• ED Decision 2003/13/RM found in: Sailplane Rule Book - Part-SAO Part-SFCL CS-22 (Nov 2022)

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.