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 The system gets its hydraulic power supply from the accumulator of the Alternate Braking Without Anti Skid system (Ref. 32-44-00) or the Yellow Main Hydraulic Power system (Ref. 29-13-00). The accumulator has sufficient capacity to hold the brakes on for a minimum time of twelve hours.
 When the selector switch PARK BRK in the cockpit is set to ON, it sends an electrical supply to the electrohydraulic park brake control valve 102GG. This valve controls the supply of hydraulic pressure to the MLG brake pistons of the Alternate Braking with Anti Skid system (Ref. 32-43-00). The hydraulic pressure available to the system (accumulator or Yellow system) and the brake pressure supplied to the MLG is shown on a triple pressure indicator (Ref. 32-44-00) in the cockpit.
 If the Normal braking system is available and, if the pedals are depressed when the PARK BRK is ON and the pressure commanded by the pedal deflection exceeds the pressure delivered by the Park brake system, the Normal system will send a complement of pressure to the Normal set of pistons to reach the commanded value.
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 Parking/Ultimate Emergency Braking
 Figure 001

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 2. Component Location__________________
 (Ref. Fig. 002)
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------73GG CTL SW-PARK BRK 110VU 211 831 32-45-52 102GG CTL VALVE-PARK BRK, ELEC 145 32-45-53
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 Component Location - PARK BRK System
 Figure 002

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 3. System Description__________________
 The parking/ultimate emergency brake system has these components:
 -
the park brake control switch 73GG

 -
the park brake control valve 102GG

 The selector switch is a four-pole, two position (OFF/ON) switch that sends the power supplies to the two electrohydraulic control valves in the system.
 The system has two independent electrical circuits each with a different power supply (service bus and hot bus). Usually the circuits are energized at the same time. Each circuit can operate the park brake control valve 102GG the other is not available.
 The HP alternate brake manifold assembly 3016GM connects the hydraulic power supply lines from the Yellow system and the accumulator (Ref. 32-44-00) to the park brake control valve 102GG.
 The HP alternate brake manifold assembly 3016GM includes a pressure relief valve. If the pressure in the system increases to more than a specified quantity (because of changes in temperature), the pressure relief valve connects the supply to the return. A manual depressurization switch lets maintenance personnel open the relief valve to release the accumulator pressure (for system servicing).
 The manifold has a check valve to prevent the flow of fluid from the accumulator to the Yellow supply line when the Yellow line is not pressurized. A pressure transducer 3068GN (Ref. 32-44-00) attached to the manifold transmits the system pressure data to the triple pressure indicator 60GG (Ref. 32-44-00) and to the ABCU (Ref. 32-43-00).
 The park brake selector valves is an electrohydraulic valve . The park brake control valve has two electric motors that can open or close the valve. When the valve is energized (open) it:
 -reduces the pressure of the available hydraulic supply to 175 bar (2500 psi)
 -sends this hydraulic supply to the alternate brake manifold assemblies (Ref. 32-43-00) of the MLG
 The park brake control valve also has an interface with the electrical de-activation box 5GC of the Nose Wheel Steering (N/WS) system (Ref. 32-51-00). The de-activation box includes a light that lets maintenance personnel see when the parking brake is set to ON.
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 4. Power Supply____________ (Ref. Fig. 003)
 5. Interface_________ (Ref. Fig. 004)
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 Electrical Power Supplies - Schematic
 Figure 003

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 System Interface
 Figure 004
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 6. Component Description_____________________
　
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