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Flaps and Slats
There are 2 flaps on each trailing edge, and 7 slats on each leading edge. They are electrically controlled by 2 SFCCs and hydraulically actuated. If one hydraulic system is inoperative, the corresponding surfaces move at half speed.
Flaps can be retracted after takeoff at or above F speed. S speed appears. As the speed accelerates past S speed, the flaps retract automatically. Slats can then be retracted.
When speed is below VFE, =, flaps 1 can be selected. Slats deploy first. Note that flaps 1+F cannot be selected from flaps 0 in the air. When flaps 2 is selected, both the slats and flaps are deployed.
Alpha/speed lock function
Inhibits slats retraction at high angle of attack and/or low speed when the flap lever is moved from 1 to 0. Occurs about VαPROT. A pulsing A LOCK replaces the S symbol when the alpha/speed lock function is activated.
Automatic retraction system
ARS operates at 200 kts when CONF 1+F is selected and retracts flaps to 0.
Flap load relief system
In CONF 2 or 3, the FLRS automatically retracts flaps to the next position if VFE is exceeded by > 2.5 kt. Slats remain in their present position. When speed decreases below VFE by > 2.5 kt, flaps return to the selected position.
Wing tip brakes
Activated in the case of asymmetry, overspeed, or uncommanded movement. The WTBs work by stopping the rotation of the shaft that extends along the length of the slats or flaps. They cannot be released in flight. The affected surface is locked in position. If flaps are locked, slats operation is still possible, and vice-versa.