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Elevator
Figure 001
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1 ELEVATOR AND HYDRAULIC ACTUATION - DESCRIPTION AND OPERATION
____________________________________________________________
1. General_______ Two electrohydraulic servocontrols hydraulically actuate each elevator.
2. Component Location__________________ (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------34CE1 SERVO CTL-L ELEVATOR, INBD G 335 334DB 27-34-51 34CE2 SERVO CTL-R ELEVATOR, INBD Y 345 344DB 27-34-51 34CE3 SERVO CTL-L ELEVATOR, OUTBD B 335 334DB 27-34-51 34CE4 SERVO CTL-R ELEVATOR, OUTBD B 345 344DB 27-34-51
Location of Elevator Servocontrol
Figure 001
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3. Component Description
_____________________
A. Elevator Servocontrol
(Ref. Fig. 002)
(1) General Each elevator is equipped with two interchangeable fixed-body electrically-controlled servo controls. Each servo control is connected to two ELACs and to two SECs.
R NOTE: vibrations could occur in the following configuration:
R - vibrations along the cabin and in the cockpit and
R - elevator control with SECs active and ELACs not active,
R No trouble shooting is necesary (elevator oscillations are wider in
R SEC mode than ELAC mode).
Each elevator is actuated by a servo control in the active mode,
while the other is in the damping mode.
the active computer achieves the closed loop control of one servo
control and commands the damping mode on the adjacent servo
control.
(Ref. Fig. 003)
In the normal configuration, the inboard servo control is in the
active mode.
4. Operation
_________
A. General
Each servo control has three operating modes:
-
the active mode which permits the actuation of the elevator depending on electrical orders,
-
the damping mode which prevents the appearance of flutter in the event of multiple failures (mainly dual hydraulic or electrical failures, disconnection of one servocontrol associated to the hydraulic or electrical failure of the other servo control),
-
the centering mode which permits to bring back and hold the elevator in the 0 position in the event of a loss of the electrical control of the two servo controls of a surface.
B. 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 two solenoid valves (1) are de-energized and let out the HP flow which sets the mode selector valve (5) in the active mode. Thus, the two actuator chambers are connected to the servovalve control line and the servovalve passes in the active mode. The mode selector-valve transducer (11) supplies an electrical signal which identifies this change of state.
Elevator Servocontrol
Figure 002
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Elevator Servocontrols - Damping and Active controls
Figure 003
One of the two feedback transducers (10) gives the servoloop
feedback. The other is in standby and used in case of failure.
NOTE : If three feedback transducers are installed, the third is not____
used.
The elevator position transducer-unit is used for the
monitoring.
The servovalve transducer (12) is also used for the
monitoring.
(2) Servocontrol in the damping mode.
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