CS 22.345  Loads with air brakes and wing-flaps extended

CAA ORS9 Decision No. 1

(a) Loads with air brakes extended

(1) The sailplane structure including airbrake system, must be capable of withstanding the most unfavourable combination of the following parameters:

Equivalent Air speed	VD (EAS)
Air brakes	from the retracted to the fully extended position
Manoeuvring load factor	from -1.5 to 3.5

(2) The horizontal tail load is assumed to correspond to the static condition of equilibrium. 

(3) In determining the spanwise load distribution, changes in this distribution due to the presence of the air brakes must be accounted for. 

(b) Load with wing-flaps extended. If wing-flaps are installed, the sailplane must be assumed to be subjected to manoeuvres and gusts as follows: 

(1) With wing-flaps in all landing settings, at speeds up to V_F: 

(i) manoeuvring up to a positive limit load factor of 4.0; 

(ii) positive and negative gusts of 7.5 m/s acting normal to the flight path. 

(2) With wing-flap positions from the most positive en-route setting to the most negative setting, the manoeuvring conditions of CS 22.333(b) and the gust conditions of CS 22.333(c), except that the following need not be considered: 

(i) speeds greater than the V_F appropriate to the wing-flap setting; 

(ii) manoeuvring load factors corresponding to points above the line AD or below the line GE of Figure 1. 

(c) Speed limiting flaps. If wing-flaps are to be used as a drag-increasing device for the purpose of speed limitation (air-brake) conditions specified in CS 22.345(a) must be met for all wing-flap positions. 

(d) When an automatic wing-flap load limiting device is used, the sailplane must be designed for the critical combination of air speed and wing-flap position allowed by that device.