AILERON - DESCRIPTION AND OPERATION
___________________________________
 1.
 General

_______ (Ref. Fig. 001) One aileron (operational at all speeds) and four spoilers ensure roll control on each wing. The Elevator and Aileron Computers (ELAC Ref. 27-93) electrically control the ailerons. The Spoilers and Elevator Computers (SEC Ref. 27-94) electrically control the spoilers. The two side stick controllers deliver electrical signals which are used for the computation of the control orders. The operation of the artificial feel system (Ref. 27-92) is independent of the flight conditions. There is no roll trim control. Two electrohydraulic servocontrols (Ref. 27-14) hydraulically actuate each aileron. One electrohydraulic servocontrol (Ref. 27-64) hydraulically actuates each spoiler. The position of the surfaces is indicated on the lower ECAM display unit through the Flight Control Data Concentrator (FCDC) (Ref. 27-95). On ground, with hydraulic systems not pressurized, the ailerons may or may not droop down to the servocontrol stop depending on the scatter of bearing and seal friction.

 2.
 System Description

__________________
 A. Interface with the Autopilot System (Ref. 22-60) In AP mode, the FMGC orders are received by the ELACs which transfer to the SECs the order which correspond to roll spoiler control. The position of the side stick control is not slaved to the AP control orders. The pilots can cancel the automatic mode, through the override of a disengaging system (which includes a spring device and a solenoid) installed in each side stick unit.

 INTENTIONALLY BLANK

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 Aileron Block Diagram
 Figure 001

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1 AILERON AND HYDRAULIC ACTUATION - DESCRIPTION AND OPERATION

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 1. General_______ The hydraulic actuation is achieved by two electrohydraulic servocontrols for each aileron.
 2. Component Location__________________ (Ref. Fig. 001)
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------33CE1 SERVO CTL-L AILERON, INBD G 575 575AT 27-14-51 33CE2 SERVO CTL-R AILERON, INBD G 675 675AT 27-14-51 33CE3 SERVO CTL-L AILERON, OUTBD B 575 575KB 27-14-51 33CE4 SERVO CTL-R AILERON, OUTBD B 675 675KB 27-14-51
 3. Hydraulic Supply (Ref. ATA 29)______________________________
 4. Component Description_____________________
 A. Aileron Servocontrol
 (1) General
 The four fixed-body servocontrols (two per aileron) are
 interchangeable.

 5. Operation_________ (Ref. Fig. 002)
 A. Normal operation with the servocontrol pressurized The pressurization of the servocontrol involves the opening of the pressure-line closing valve (2) and of the return-line closing valve (3). Thus, the servovalve (4) is supplied from the HP system and the return system of the servocontrol is connected to the LP system.
 (1)
 Servocontrol in the active mode. In this case, the solenoid valve (1) is energized and lets in the HP flow which puts the mode selector valve (5) in the active mode. The two chambers of the actuator are thus connected to the servovalve control lines. The servocontrol is then in the active mode. The Linear Variable-Differential Transducer (LVDT) (11) supplies an electrical signal which identifies this change of state. The feedback transducer (LVDT) (10) gives the servoloop feedback.

 (2)
 Servocontrol in the damping mode. In this configuration, the solenoid valve is de-energized and the mode selector-valve moves under the action of its spring. This causes the two chambers of the actuator to be interconnected through the damping orifice (6). The linear variable-differential transformer identifies this change of state. The check valve (7) and the fluid reserve (9) hold the volume of fluid in the actuator chambers :

 -
if the temperature of the hydraulic fluid changes

 -
if there is a leakage.
 The reserve of fluid is permanently connected to the return line of
 the servovalve. The return relief valve (8) increases the pressure in
 the return line and permits to fill the reserve of fluid.

R  Location of Aileron Servocontrols Figure 001
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 Aileron Servocontrol
 Figure 002
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