Under CS 22.49, what conditions apply to a powered sailplane when determining VS0 and VS1?

For a powered sailplane, the engine must be idling (throttle closed), the propeller in the take-off position, and cowl flaps closed when determining VS0 and VS1.

What is VS0 in the context of sailplane stalling speed according to CS 22.49?

VS0 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable, with landing gear extended, wing-flaps in the landing position, air brakes retracted or extended (whichever results in the lowest VS0), maximum weight, and c.g. in the most unfavourable position.

What is the maximum allowable stalling speed in the landing configuration for a sailplane with airbrakes retracted and maximum weight with water ballast tanks empty, according to CS 22.49?

The stalling speed must not exceed 80 km/h with air brakes retracted and at maximum weight with water ballast tanks empty.

CS 22.49 Stalling speed

Q: How are VS0 and VS1 determined according to CS 22.49?

VS0 and VS1 must be determined by flight tests using the procedure specified in CS 22.201.

Q: What is VS1 in the context of sailplane stalling speed according to CS 22.49?

VS1 is the stalling speed (CAS), if obtainable, or the minimum steady speed at which the sailplane is controllable with the sailplane in the configuration existing in the test in which VS1 is being used and the weight used when VS1 is being used as a factor to determine compliance with a required performance standard.

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CS 22.49 Stalling speed

ED Decision 2003/13/RM

(a) V_S0 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 V_S0;

(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) V_S1 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 V_S1 is being used; and

(2) weight used when V_S1 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) V_S0 and V_S1 must be determined by flight tests using the procedure specified in CS 22.201.

Details

Source-Title: CS 22.49 Stalling speed View latest amendments

Erulesid: ERULES-1963177438-5088 Compare versions

Domain: Initial airworthiness

Amendedby: Initial issue

Applicabilitydate: 14 November, 2003

Entryintoforcedate: 14 November, 2003

Regulatorysource: ED Decision 2003/13/RM Navigate

Regulatorysubject: CS-22

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR