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.
Sailplane propeller safety: Propeller speed and pitch must ensure safe operation. Controllable propellers need clear pitch range indication. Uncontrollable propellers must limit engine speed during takeoff/climb and glide. Constant speed propellers require speed limiting mechanisms, even with governor failure, preventing overspeed.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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