-
Monitoring of the transducers (Ref. 22-65-00)
-
Monitoring of the manual trim by the priority logics.
4. Interface with Controls
_______________________
A. Interface with Rudder-Trim Control Switch
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
(Ref. Fig. 006)
R **ON A/C 151-199, 401-499,
(Ref. Fig. 006A)
**ON A/C ALL
(Ref. Fig. 007)
The rudder-trim control switch located on the center pedestal enables
manual control of the rudder trim.
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Rudder-Trim Control Switch
Figure 006
Rudder-Trim Control Switch
Figure 006A
Interconnections between FAC and Rudder-Trim Control Switch Figure 007
On the RUD TRIM control panel, an arrow and a placard indicate the
direction (L or R).
The signals given below are used:
-Ground on the normally open contact = control
-Open circuit on the normally closed contact = control.
Each FAC receives:
-
Two signals (ground and open circuit) for trim control to the left
-
Two signals (ground and open circuit) for trim control to the right.
B. Interface with RUD TRIM/RESET Pushbutton Switch (Ref. Fig. 008) The RUD TRIM/RESET pushbutton switch located on the center pedestal enables the pilot to move the rudder to the neutral position. This pushbutton switch is not mechanically held. While operated (pushed in), it closes two contact stages. The FAC memorizes this action and then achieves the reset (even after the pushbutton switch is released). Each FAC receives two reset signals:
-
One signal of the normally closed contact from one stage
-
One signal of the normally open contact from the other stage.
Reset signal active:
-
Normally closed contact : open circuit
-
Normally open contact : ground.
C. Interface with Rudder Trim Actuator
(1)
Description of rudder trim actuator (Ref. Fig. 009) The rudder trim actuator which comprises two motors enables the accomplishment of the rudder trim order. These motors are squirrel-cage, three-phase asynchronous motors. They are supplied with variable voltage and frequency according to the position error signal delivered by the FAC. A power electronic set in the actuator permits to achieve this transformation. It allows to obtain torque/speed characteristics equivalent to those obtained with a DC motor. The actuator is power supplied with 26 V/400 Hz and 28 V directly from the FAC circuit breakers. A control relay controlled by the FAC command logic can isolate the windings of the motor. In addition, an external relay cuts off the power to the motor through the FAC monitoring logic. This disables the motor in the event of a failure. The slaving feedback units are brushless inductive potentiometers with Rotary Variable Differential Transformers (RVDT). The output shaft of the actuator drives an irreversible screw through a torque shaft.
(2)
Interface (Ref. Fig. 010) The figure given below shows the interconnections between the FAC and the rudder trim actuator.
Interconnections between FAC and RUD TRIM/RESET Pushbutton Switch Figure 008
Rudder Trim Actuator - Principle Figure 009
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Interconnections between FAC and Rudder Trim Actuator
Figure 010
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______________ When the FAC initiates the self-test upon energization, an actuator internal monitoring enables to check:
-
The capability of the actuator electronic set for correct slaving
according to a predetermined order
-
The triggering capability of the monitoring if this slaving is not
achieved
-
The correct reception of the enable signal.
To this end the FAC delivers stimuli during the test procedure.
The monitoring logic utilizes a specific stage of the winding isolation
relay to test the enable signal.
The result of the monitoring is available on the test output. It is to be
noted that during the test no inputs are applied to displace the rudder.
The test therefore uses:
-
The inactive stage of the winding isolation relays which send back the actuator control orders to the monitoring circuits
-Another stage of the relay to check that the control relay moves to the working position
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