The BSCU continuously monitors the alternate braking system to make sure that it is serviceable.
If specified failures occur in the system, control automatically changes to its alternative mode of operation, Alternate Braking Without Anti Skid (Ref. 32-44-00).
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Alternate Braking with Anti Skid
Figure 001
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2. Component Location
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-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE| ACCESS| ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------95GG ABCU 122 811 32-43-34 97GG DIRECT DRIVE VALVE LH ALT BRK 32-43-35 98GG DIRECT DRIVE VALVE RH ALT BRK 32-43-35 99GG SELECTOR VALVE ALT BRK 32-43-51 100GG PRESS XDCR BRK YELLOW R 32-44-19 101GG PRESS XDCR BRK YELLOW L 32-44-19 103GG XMTR UNIT ALTN BRK PEDAL 32-43-47 2853GM ALT BRK MANIFOLD LH 32-43-32 2852GM ALT BRK MANIFOLD RH 32-43-32 2862GM FILTER HP ALTN BRK YELLOW 32-43-32 3016GM ALT HP MANIFOLD 32-44-17 3067GM PRESSURE RELIEF VALVE 32-44-15
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3. System Description__________________
The alternate braking with anti skid system is an electrohydraulic system that automatically becomes available when the normal braking system (Ref. 32-42-00) is not available. Braking inputs are made only at the brake pedals. The hydraulic power to operate the brakes is supplied from the Yellow Main HydraulicPower System (Ref. 29-13-00). The BSCU (Ref. 32-42-00) controls the operation of the system and its anti skid function and also monitors the system to make sure that it is serviceable.
The system includes these primary components:
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a left alternate brake manifold
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a righ alternate brake manifold
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a HP manifold assembly
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a return manifold .
The system also uses the components that follow to supply the braking inputs or control functions necessary for the operation of the system:
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the transmitter unit 103GG at the brake pedals
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the selector valve 99GG
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the tachometer in each axle (Ref. 32-42-00)
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the second set of pistons at the brake units (32-42-00)
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the pressure transducers (100 GG and 101 GG) at each manifold assembly .
The selector valve 99GG has two functions:
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it lets the hydraulic supply go to the system when braking inputs are made
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it lets the hydraulic pressure in the system go to the return manifold when braking inputs are not made.
The alternate manifold assemblies 2853GM and 2852GM are located in the wing shroud boxes and include:
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a manifold
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a Direct Drive Valve (DDV)
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a safety valve (hydraulic fuse)
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a shuttle valve
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a pressure transducer.
The manifold has two supply ports.One supply port is for the alternate braking system and one for the parking brake system (Ref. 32-45-00). The service port connects to the brakes. The manifold also includes a filter.
The DDV operates when necessary to:
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connect the necessary hydraulic pressure through a safety valve to the related service port
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connect the service port to return.
The ABCU sends the necessary control current to the DDV to:
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give the correct pressure at the related brakes
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give the anti skid control.The ABCU substracts antiskid currents given by the BSCU to the pressure control current (function of the pedal angle) computed by the ABCU.
-connect the brakes to the return line.
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