(2)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
(3)
On the overhead panel 23VU, push the FLT CTL/FAC 1 pushbutton switch and make sure that the OFF legend goes off.
(4)
On the overhead panel 24VU, push the FLT CTL/FAC 2 pushbutton switch and make sure that the OFF legend goes off.
Subtask 27-23-51-710-051
E. Do an operational test of the travel limitation unit (Ref. TASK 22-61-00-710-001).
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5. Close-up
________ Subtask 27-23-51-010-052
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access panels 325DL and 325CL or 325DR and 325CR which you opened before.
(3)
Remove the warning notice(s).
(4)
Remove the access platform(s).
RUDDER HYDRAULIC ACTUATION - DESCRIPTION AND OPERATION
______________________________________________________
1.
General
_______
Three fixed-body servocontrols with mechanical input are used to
hydraulically actuate the rudder.
Each servocontrol is powered by a different hydraulic system.
2.
Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------1025GM SERVO CTL-RUDDER, G 325 325BL 27-24-51 2025GM SERVO CTL-RUDDER, B 325 325DL 27-24-51 3025GM SERVO CTL-RUDDER, Y 325 325CL 27-24-51
Location of Rudder Servocontrols
Figure 001
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3.
Hydraulic Supply (Ref. 27-00)
_____________________________
4.
Component Description
_____________________
A. Rudder Servocontrol
(Ref. Fig. 002)
(1) General
The three servocontrols are interchangeable.
5. Operation
_________
A. Normal operation with the servocontrol pressurized The moving piston rod of the servocontrol is slaved to the mechanical input signal via the input lever (10). This lever is hinged in the middle on the rotary input lever (11). It is connected at one end to the input rod and at the other end to the feedback rod (12). The rotary lever (11) actuates the control valve (8) and the stops (1) limit its travel. In the event of overpressure in one of the chambers, the chamber overpressure is applied against one of the two pistons (2) and/or (3). It sets the damping and pressure-relief valve (5) to the bypass position. Then the chambers are isolated from the control valve and connected via the damping hole (6). The high pressure is connected to the return via the heating orifice (9). This ensures permanent heating leakage. The vent hole (13) serves to vent over or under pressure of air occurring in the internal chamber of the cylinder assy.
B. Operation on the ground with the servocontrol depressurized When the servocontrol is depressurized, the spring (4) sets the damping and pressure-relief valve to the bypass position. If the rudder is subjected to external forces, the pressure increases in one of the two chambers. This causes the movement of the servocontrol piston. The fluid goes from one chamber to the other via the damping orifice and provides a ground gust-damping function for gust speeds up to 80 Kts. Two anti-cavitation valves permit the suction of the necessary volume of hydraulic fluid to compensate for the thermal retraction on ground, in the damping mode.
Rudder Servocontrol
Figure 002
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C. Maintenance, rigging facilities, periodic tests
The maintenance is "On condition".
The items given below are Line-Replaceable Unit :
-Filter
-Actuator eye-end.
To replace the servocontrol, it is necessary to have simultaneously the
surface and the servocontrol in the neutral position.
To this end, the adjustment of the servocontrol is obtained through the
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