Actuator - Typical Installation
Figure 004
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Actuator - Typical Installation
Figure 004A
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Slat and Track Fairing-Operation Figure 005
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Each input gearbox has a torque limiter which operates in the two directions (extend/retract). Each torque limiter has a lock-out torque value set as necessary for its location. The torque limiters protect the wing structure and the actuators from a torque overload which could occur by a slat transmission failure. A mechanical indicator on each actuator latches if a lock-out occurs. You can set the indicator again when the aircraft is on the ground.
Attachment of the actuators is to housings. Bolts attach the housings to the structure at tracks 2, 3 and 5 thru 12.
Each actuator moves its related track through a pinion. The actuator output shaft moves the pinion which engages with a gear rack. Bolts attach the gear rack to the track. The tracks operate in vertical-load rollers and side-load rollers. The tracks retract through holes in the front spar into sealed containers. The sealed containers make a projection into the fuel tanks.
Tracks 1 and 4 are made almost the same as the moved tracks but without the gear rack. They are to prevent that slat 1 falls away if there is a slat attachment failure.
4. Power Supply____________
Not Applicable
5. Interface_________
Not Applicable
6. Component Description_____________________
(Ref. Fig. 006, 007)
A. Power Control Unit (6001CM)
(1) Description
The slat PCU is a hydromechanical unit. The main body, which is a
case, contains a differential gearbox.
The Line Replaceable Units (LRUs) of the PCU are as follows:
-
two hydraulic motors
-
two Pressure-Off Brakes (POB)
-
two valve blocks
-six solenoid valves
-two inlet filters
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Power Control Unit Figure 006
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Power Control Unit - Schematic Figure 007
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- one Feedback Position Pick-off Unit (FPPU) - one Instrumentation Position Pick-off Unit (IPPU).
(a) Hydraulic Motor
(Ref. Fig. 008)
Each multi-piston hydraulic motor receives hydraulic pressure from a valve block. The output shaft of the motor is connected to a POB. Hydraulic fluid lubricates the motor. The cylinders of the motor are connected to two ports, referred to as the extend and retract ports. When the valve block supplies hydraulic fluid to the extend port, the motor moves in the direction necessary to extend the slats. When hydraulic pressure is supplied to the retract port, the motor moves in the opposite direction and the slats retract.
(b) Pressure-Off Brake (POB)
(Ref. Fig. 009)
A POB is attached to each hydraulic motor. It holds the output shaft of the hydraulic motor when:
-
the hydraulic motors do not operate
-
the related hydraulic system does not supply sufficient
hydraulic power
-
the WTB stops the slat transmission system because of some system failures.
The POB has a multiple friction-disk pack. Splines connect the stators to the POB casing and the rotors to the shaft in the center of the POB. Springs hold the friction disks together. When hydraulic pressure is applied to the POB, the friction disks are disengaged (against the pressure of the springs). To remove the POB, you must remove the related hydraulic motor first.
(c) Valve Block
(Ref. Fig. 010)
The slat PCU has two valve blocks which are electrically controlled. Each valve block controls the flow of hydraulic fluid to its related hydraulic motor and POB.
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Hydraulic Motor Figure 008
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Pressure-Off Brake Figure 009
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Valve Block Figure 010
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The Linear Variable Differential Transducer (LVDT) is installed on one end of the valve block. The LVDT monitors the position of the control valve. Installed on the valve block opposite the LVDT are two directional solenoid valves and one POB solenoid valve. The directional solenoid valves operate as the extend or the retract solenoid valves. The POB solenoid valve operates as the brake solenoid valve. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM FLIGHT CONTROLS 飞行操纵7(86)
