CS 22.697  Wing-flap and air-brake controls

CAA ORS9 Decision No. 1

(a) Each wing-flap control must be designed so that, when the wing-flap has been placed in any position upon which compliance with the performance requirements of this Part is based, the wing-flap will not move from that position except when: 

(1) the control is adjusted; or 

(2) the wing-flap is moved by the automatic operation of a wing-flap load limiting device; or  (3) movement other than in accordance with (1) or (2) is demonstrated not to be hazardous. 

(b) Each wing-flap and air brake must be designed to prevent inadvertent extension or movement. The pilot forces and the rate of movement at any approved flight speed must not be such as to impair the operating safety of the sailplane. 

(c) The air brake or other drag increasing device necessary to show compliance with CS 22.73 and/or CS 22.75 must comply with the following: 

(1) Where the device is divided into several parts, all parts must be operated by a single control. 

(2) It must be possible to extend the device at any speed up to 1.05 V_NE and to retract the device at any speed up to V_T, but not less than 1.8 V_S1, with a hand force not exceeding 20 daN.

(3) The time required for extension as well as retraction of the device may not exceed 2 seconds.