A320飞机维护手册 AMM LANDING GEAR 起落架7(51)

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 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE| ACCESS| ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------40GG SERVOVALVE-ALTN BRK WHEEL 3 671 32-43-27 41GG SERVOVALVE-ALTN BRK WHEEL 1 571 32-43-27 42GG SERVOVALVE-ALTN BRK WHEEL 4 671 32-43-27 43GG SERVOVALVE-ALTN BRK WHEEL 2 571 32-43-27
 2577GM DUAL VALVE-ALTN BRK DISTR 148 744 32-43-14 2614GM MANIFOLD-ALTN BRK SERVOVALVE, R 671 32-43-31 2615GM MANIFOLD-ALTN BRK SERVOVALVE, L 571 32-43-31 2620GM SAFETY VALVE-ALTN BRK WHEEL 1 571 32-43-16 2621GM SAFETY VALVE-ALTN BRK WHEEL 4 671 32-43-16 2622GM SAFETY VALVE-ALTN BRK WHEEL 2 571 32-43-16 2623GM SAFETY VALVE-ALTN BRK WHEEL 3 671 32-43-16 2624GM HYD RESERVOIR-BRK CTL 122 811 32-43-11 2625GM MASTER CYL-BRK CTL, L 122 811 32-43-12 2626GM MASTER CYL-BRK CTL, R 122 811 32-43-12
 3. System Description
__________________ R
 A. Auxiliary Low-Pressure Control-System
 (1) Brake-control hydraulic reservoir (Ref. Fig. 003) The reservoir supplies the master cylinders of the Alternate system with hydraulic fluid to make allowance for:
 -the changes in the volume of the fluid,
 -possible leakages.
 1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-43-00Page 5 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1

 Servovalve / Safety Valve - Alternate Braking - Component Location
 Figure 002

 1EFF : 001-002, 051-052, 1 32-43-00Page 6 1 1 Config-1 Aug 01/05 1 1 1CES 1

 Servovalve / Safety Valve - Alternate Braking - Component Location
 Figure 002A

 1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-43-00Page 7 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1

 Brake-Control Hydraulic Reservoir
 Figure 003

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 A spring-loaded piston pressurizes the reservoir lightly (1.5 bars
 absolute).
 The reservoir has a filling valve and two calibrated valves:
 - one which limits the internal pressure,

 -the other which removes fluid if an overpressure occurs.
 (2) Master cylinders (Ref. Fig. 004, 005) There are two master cylinders (one for the left side, one for the right side). The master cylinders are used to:
 -control the distribution dual valve of the Alternate brake system by displacement of a volume of fluid from chamber C1,
 -give artificial feel at the pedals by means of an internal spring and the load resulting from the pressure that increases in the control circuit.
 (Ref. Fig. 006)
 When the pedals are released an internal valve opens to connect the
 chamber C1 to the upper chamber C2 which is then connected to the
 hydraulic reservoir.
 The chamber C2 contains a safety reserve of fluid.

 (3) Alternate-brake distribution dual-valve
R  (Ref. Fig. 007, 008, 009) The distribution dual valve includes two independent pressure-reducing valves, one for each main gear. A master cylinder operates each valve. The distribution dual valve is installed in the hydraulics compartment. (Ref. Fig. 009) A transparent drain tube connected to the cover of the distribution dual valve, allows to check for possible presence of water. A cap closes this tube. Each pressure reducing valve includes a control piston which operates a distribution slide valve through a spring R1 and a rocker arm. When the pedal is released, the Yellow pressure at A is shut off and the brake port C is connected to the reservoir return B. When the pedal is pushed in, the volume of fluid moved by the master cylinder causes the displacement of the piston which then operates the rocker arm and the slide valve; B is shut off and the pressure port A is connected to the brake port C. When line C is filled, the pressure pushes on the end of the slide valve (chamber D) which, through the rocker arm, causes the spring R1 to compress; the control piston remains in the same position.
 1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-43-00Page 9 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1

 Master Cylinder
 Figure 004

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 Reservoir / Master Cylinder - Brake Control - Component Location
 Figure 005

 1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-43-00Page 11 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1

 Master Cylinder Load in Relation to Travel
 Figure 006

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 Dual Valve - Alternate Braking - Component Location
　
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