CS 22.1149 Propeller speed and pitch controls

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

CS 22.1149 Propeller speed and pitch controls ED Decision 2003/13/RM (a) Propeller speed and pitch must be limited to values that ensure safe operation under normal operating conditions. In addition - (1) If there are propeller speed or pitch controls, their operation must not require undue attention or exceptional skill. (2) For variable pitch propellers provisions must be made for a positive indication that (i) the allowable pitch range for engine start; and (ii) the take-off pitch position has been reached. (b) Propellers that cannot be controlled in flight must meet the following requirements: (1) during take-off and initial climb at VY, the propeller must limit the engine rotational speed at full throttle to a value not greater than the maximum allowable take-off rotational speed, and (2) during a glide at VNE with throttle closed or the engine inoperative, provided this has no detrimental effect on the engine, the propeller must not permit the engine to achieve a rotational speed greater than 110% of the maximum continuous speed. (3) For powered sailplanes capable of extending and retracting the powerplant during a glide at VPE with the throttle closed, the propeller must not permit the engine to achieve a rotational speed of more than 110% of the max. continuous speed. VPE must not be less than 1.4 VS1 where VS1 is the stalling speed with the wing flaps neutral at maximum weight. (c) A propeller that can be controlled in flight but does not have constant speed controls must be so designed that – (1) [CS 22.1149(b)(1)](#_DxCrossRefBm2056272308) is met with the lowest possible pitch selected, and (2) [CS 22.1149(b)(2)](#_DxCrossRefBm2056272308) is met with the highest possible pitch selected. (d) A controllable pitch propeller with constant speed controls must comply with the following requirements: (1) with the governor in operation, there must be a means to limit the maximum engine rotational speed to the maximum allowable take-off speed, and (2) with the governor inoperative, there must be a means to limit the maximum engine rotational speed to 103% of the maximum allowable take-off speed with the propeller blades at the lowest possible pitch and the powered sailplane stationary with no wind.