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) is met with the lowest possible pitch selected, and
(2) CS 22.1149(b)(2) 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.
EASA sailplane propeller regulations mandate safe operation. Pitch and speed controls must be intuitive. Variable pitch propellers need clear start and takeoff position indicators. Uncontrollable propellers must limit engine speed during takeoff and glide. Controllable propellers must meet speed limits at extreme pitch settings. Constant speed propellers require governing and overspeed protection.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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