There are 3 ailerons assisted by the 6 outer spoilers, for roll control, on each wing
The outer ailerons:
Are not deflected down above 240 kt .
Are not deflected up above 300 kt (except for the Load Alleviation Function).
The maximum aileron deflection is 20 ° down and 30 ° up.
Each aileron has two electrically-controlled actuators (conventional or EHA):
One actuator is active (it commands the position of the surface)
The other actuator is in damping mode (it follows the movement of the surface).
ELECTRICAL CONTROL
Only one flight control computer per aileron is active. The others are in stand-by.
When all systems are operative:
PRIM 1 controls the inboard ailerons
PRIM 2 controls the outboard ailerons
PRIM 3 controls the mid ailerons.
If a PRIM or a hydraulic system fails, another flight control computer and power source will take over, to ensure maximum aileron availability.
For example: for the outboard ailerons, if PRIM 2 or the green hydraulic system fails, PRIM 3 and the yellow hydraulic system will takeover.
The inboard ailerons remain available in backup control.