ED Decision 2003/13/RM
(a) VS0 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable, with:
(1) landing gear extended;
(2) wing-flaps in the landing position;
(3) air brakes retracted or extended whichever position results in the lowest value of VS0;
(4) maximum weight; and
(5) c.g. in the most unfavourable position within the allowable range.
(6) For a powered sailplane:
(i) the engine idling (throttle closed);
(ii) propeller in the take-off position;
(iii) cowl flaps closed.
(b) The stalling speed in the landing configuration must not exceed:
(1) 80 km/h with:
(i) air brakes retracted; and at
(ii) maximum weight with water ballast tanks empty.
(2) 90 km/h with:
(i) airbrakes retracted, and at
(ii) maximum weight with water ballast.
(3) 95 km/h with:
(i) airbrakes fully extended; and at
(ii) maximum weight with water ballast.
(c) VS1 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable with the:
(1) sailplane in the configuration existing in the test in which VS1 is being used; and
(2) weight used when VS1 is being used as a factor to determine compliance with a required performance standard.
(3) For a powered sailplane:
(i) the engine idling (throttle closed);
(ii) propeller in the take-off position;
(iii) cowl flaps closed.
(d) Reserved.
(e) VS0 and VS1 must be determined by flight tests using the procedure specified in CS 22.201.
Sailplane stalling speed regulations define VS0 (landing configuration) and VS1 (specific configuration) testing. VS0 must be determined with landing gear extended, flaps in landing position, and at maximum weight. Speed limits apply based on airbrake position and ballast. Flight tests, as per regulations, determine these critical safety speeds.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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