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 One solenoid valve at least is energized and the mode selector is
 displaced in the damping mode under the action of its spring.
 This causes the interconnection of the two actuator chambers through
 the damping orifice (6).
 The mode selector-valve transducer 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 return relief valve (8) increases the pressure in the return line
 and permits to fill the reserve of fluid.
 (3) Servocontrol in the centering mode.
 With the solenoid valves and servovalve de-energized the servovalve
 control valve is centered to the neutral position by its mechanical
 input.
 The mechanical input is always positioned by the linkage (13) so as
 to give a control order opposed to the preceding electrical control
 order.
 Thus the servocontrol goes back and stays in the zero position. 
R  (4) Differential pressure indicator 
R 
R  The purpose of differential pressure indicator (16) is to check the 
R  return relief valve (8). It controls: 
R 
R  - that the return relief valve provides a differential pressure 
R  greater or equal to 4 +0.5 -0.5 bar (58.0150 +7.2518 -7.2518 psi). 
R 
R  - that the return relief valve does not stick in the open position. 
R 
R  - that the return relief valve closes properly.
 C. Operation after a simple electrical failure.
 In this case, the solenoid valve is energized and the servocontrol
 operates in the damping mode (Ref. para. (2) (b)).

 

 D. Operation after a total electrical failure. In this case, the solenoid valves and the servovalves are de-energized and the servocontrol operates in the centering mode (Ref. para. (2) (c)).
 E. Operation after a hydraulic failure. The closing valves (2) and (3) close and isolate the servocontrol from the aircraft hydraulic system. If there is a rupture of the aircraft return line, the return relief-valve holds the fluid volume in the fluid reserve. The mode selector-valve is set to the damping mode under the action of its spring. Thus, the servocontrol operates in the damping mode.
 F. Special case After hydraulic depressurization, a difference in droop speed and travel between the two elevators is possible. This is because of the variations of friction in the attachments and the servo control. This difference is correct.
 G. Maintenance and rigging facilities.
 The maintenance is "on condition".
 The items given below are Line Replaceable Units:

 -Filter

 -Mode selector-valve transducer

 -Solenoid valves

 -Servovalve

 -Actuator eye-end.
 To replace the servocontrol, it is necessary to have simultaneously the
 surface and the servocontrol in the neutral position.

R This is done through the adjustment of the rod eye-end length. R
R H. Particular points. During flight, vibrations may occur with the current elevator neutral setting combined with backlash at the elevator servo control attachments. To avoid this situation, the elevator zero position is shifted 0.5 deg nose-up, trailing edge upwards.

 ELEVATOR AND HYDRAULIC ACTUATION - DEACTIVATION/REACTIVATION
____________________________________________________________ TASK 27-34-00-040-001 Elevator Servocontrol Position-Transducer - Connection of the Spare Transducer WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______ START A TASK ON OR NEAR:
 -
THE FLIGHT CONTROLS

 -
THE FLIGHT CONTROL SURFACES

 -
THE LANDING GEAR AND THE RELATED DOORS

 -COMPONENTS THAT MOVE. WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR.
_______ MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
 1. Reason for the Job
__________________
 Refer to the MMEL TASK: 27-34-02
 Elevator - Elevator Servocontrol Position
 Transducer

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific access platform 5.35 m (17 ft. 7 in.)
 1EFF : ALL 1 27-34-00Page 401 1 1 May 01/04R 1 1 1CES 1
　
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