CS-VLA 33 Propeller speed and pitch limits
ED Decision 2003/18/RM
(a) Propeller speed and pitch must be limited to values that ensure safe operation under normal operating conditions.
(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.
(c) A propeller that can be controlled in flight but does not have constant speed controls must be so designed that -
(1) Sub-paragraph (b)(1) is met with the lowest possible pitch selected, and
(2) Sub-paragraph (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 aeroplane stationary with no wind at full throttle position.
EASA CS-VLA propeller regulations mandate speed and pitch limits for safe operation of very light aeroplanes. Propellers must prevent engine overspeed during takeoff/climb and gliding. Controllable propellers require governing systems to limit engine RPM, ensuring safety even with governor failure.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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