_______ The hydraulic actuation is achieved by one electrohydraulic servocontrol with asymmetrical chambers, for each spoiler.

 2.
 Component Location

__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)

R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 301-399,
 (Ref. Fig. 001B)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------31CE1 SERVO CTL-SPLR1, L G 574 573BB 27-64-51 31CE2 SERVO CTL-SPLR1, R G 674 673BB 27-64-51 31CE3 SERVO CTL-SPLR2, L Y 583 575BB 27-64-51 31CE4 SERVO CTL-SPLR2, R Y 683 675BB 27-64-51 31CE5 SERVO CTL-SPLR3, L B 584 575DB 27-64-51 31CE6 SERVO CTL-SPLR3, R B 684 675DB 27-64-51 31CE7 SERVO CTL-SPLR4, L Y 584 31CE8 SERVO CTL-SPLR4, R Y 684 31CE9 SERVO CTL-SPLR5, L G 585 31CE10 SERVO CTL-SPLR5, R G 685

 Location of Spoiler Servocontrol
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 27-64-00Page 2 1 1 May 01/05 1 1 1CES 1

 Location of Spoiler Servocontrol
 Figure 001A

R 1EFF : 151-199, 401-499, 1 27-64-00Page 3 1 1 Aug 01/05 1 1 1CES 1

R  Location of Spoiler Servocontrol 
R  Figure 001B 
R 1EFF :  301-399,  1  27-64-00 Page 4 
1  1  May 01/04
 1  1
 1CES  1

 3.
 Hydraulic Supply (Ref. 27-00)

_____________________________

 4.
 Component Description

_____________________
 A. Servocontrols of Spoilers 1 thru 5
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)

R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 301-399,
 (Ref. Fig. 001B)
 **ON A/C ALL
 (1) General The five fixed body servocontrols (one per spoiler) are interchangeable.
 5. Operation
_________
 (Ref. Fig. 002)

 A. Normal operation with the servocontrol pressurized In this case, the high pressure is applied to the bypass valve (3) and to the plunger (7) which hold the closing valve (6). Thus the two actuator chambers are connected to the servovalve control lines. The feedback transducer (11) provides the servoloop feedback. The servovalve has a biased zero. When the input signal is equivalent to the electrical zero, its spool valve is open at 25 % of its max. stroke and connects the supply line of the small chamber to the high pressure. When the spoiler is at neutral, it is held against the servocontrol stop by nulling the current of the servovalve. The servovalve then feeds the high pressure to the small chamber and applies the piston rod to its internal retraction stop.
 B. Operation after an electrical failure In this case the servovalve input signal is nulled. This biases the servovalve in order to make the piston rod retract.

 Spoiler 1 thru 5 Servocontrol Figure 002
 1EFF : 1 1R 1CES  ALL  1 11 1 27-64-00 Page 6 May 01/04

 C. Operation after a hydraulic failure When the pressure drops :
 -
the relief valve (2) moves under the action of its spring. This
 isolates the servovalve from the high pressure

 -
the plunger (7) frees the closing valve (6). This prevents the
 extension of the piston rod

 -
the bypass valve (3) moves rearward under the action of its spring. This isolates the piston chambers from the servovalve control lines then the two piston chambers are interconnected in the retraction direction via the closing valve (6).

 The servocontrol can be retracted by external forces.
 The calibration valve (4) and the anti-cavitation valve (5) prevent any
 low pressure in the small chamber by slowing, down, the transit of the
 fluid surplus of the large chamber in the return line.

 D. Operation in case of high pressure decrease When the HP decreases but remains sufficient to keep the bypass valve in the active mode, the piston retracts under external forces. These forces are higher than those delivered by the large chamber pressure. They cause the servovalve spool valve to open in the direction which connects the large chamber to the pressure line. Then the check valve (2) allows to servovalve retraction at low speed as the fluid transits through the servovalve leakages.
 E. Operation on the ground with the servocontrol depressurized
 -
　
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