ANTISKID/AUTOBRAKE SYSTEM -SPECIAL FUNCTIONS
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
PARKING BRAKE SYSTEM -INTRODUCTION
Purpose
The parking brake system uses the available brake pressure to keep the main landing gear brakes applied when the airplane is parked.
Brake status lights on the nose landing gear and the PARKING BRAKE SET memo message show the condition of the parking brake system.
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777 AIRCRAFT MAINTENANCE MANUAL
PARKING BRAKE SYSTEM -INTRODUCTION
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PARKING BRAKE SYSTEM -GENERAL DESCRIPTION
Components Training Information Point
These are the parking brake system components: A fully charged (3000 psig) brake accumulator will keep the brakes pressurized at least eight hours.
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Parking brake lever
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Parking brake latch mechanism
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Parking brake latch switch (2)
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Parking brake valve
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Pedal position switch (2)
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Brake metered pressure switch (2)
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Brake status indication light (3).
General Description
When you push the brake pedals and pull the parking brake lever, the latch mechanism latches the brake pedals in the brakes-applied position.
The parking brake latch switches send a signal to close the parking brake valve. They also send a signal to AIMS for flight deck indication.
The parking brake valve prevents brake pressure leakage through the normal antiskid valves.
Pedal position switches and brake metered pressure switches send signals to the brake status indication lights on the nose landing gear. These lights show people on the ground the brake system status.
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PARKING BRAKE SYSTEM -GENERAL DESCRIPTION
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PARKING BRAKE SYSTEM -COMPONENT LOCATIONS
General
The parking brake lever is on the left side of the P10 control stand.
The parking brake latch mechanism is under the flight deck floor below the captain’s rudder pedals. Two parking brake latch switches are on the latch mechanism.
Two brake pedal position switches are on the brake pedal quadrant assemblies.
The parking brake valve is on the main landing gear beam outboard of the right main landing gear trunnion.
The brake metered pressure switches are on forward wall in the left and right main landing gear wheel wells.
The brake status indication lights are on landing and taxi light brackets on the nose landing gear.
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PARKING BRAKE SYSTEM -COMPONENT LOCATIONS
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PARKING BRAKE SYSTEM -PARKING BRAKE LEVER
Purpose
The parking brake lever mechanically moves the brake latch mechanism to lock the brakes in the applied position.
Location
The parking brake lever is aft of the cursor control device on the left side of the P10 control stand.
Operation
To set the parking brake, push the captain’s brake pedals to the fully-applied position. While holding the pedals in position, pull up and aft on the parking brake lever. Then release pedal pressure. This holds the brake pedals in the applied position.
The lever stays in the up and aft position when the parking brake is set.
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