Ailerons
Each aileron can be actuated by two different servocontrols. In normal operation, one servocontrol per aileron is active ( controlled by ELAC 1 ), the other is in damping mode - on the left aileron, the blue servocontrol is active - on the right aileron, the green servocontrol is active The servocontrols, controlled by the ELAC 2 , green on the left side and blue on the right side are in damping mode.
The ailerons are normally controlled by the ELAC 1, the ELAC 2 is in standby and the associated servocontrols are in damping mode. In case of ELAC 1 failure, the control of the ailerons is automatically transferred to the ELAC 2 which becomes active through the left green and right blue servo controls.
In that case the servo controls dedicated to the ELAC 1 revert to the damping mode. In case of double ELAC failure, or blue and green hydraulic system low pres-sure, all ailerons are in the damping mode.
If ELAC 1 can only drive one aileron, the ELAC 2 drives the other aileron from the order computed by the ELAC 1.