PARKING BRAKE SYSTEM -BRAKE STATUS INDICATION LIGHTS
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PARKING BRAKE -FUNCTIONAL DESCRIPTION -CONTROL AND PARKING BRAKE-SET LIGHT INDICATION
General * ANTISKID status message.
When the parking brake lever is set, one parking brake latch switch sends hot battery bus power to close the parking brake valve. The BSCU also monitors lever position through this switch.
Both parking brake latch switches send signals to the AIMS. The AIMS uses this data to monitor parking brake lever position for the warning electronics system and memo message display.
When the parking brake valve is fully closed, an internal switch uses hot battery bus power to energize the parking brake close relay.
Indication
The parking brake close relay tells the AIMS to show the PARKING BRAKE SET memo message on the EICAS display. The close relay also turns on the parking brake set light on the nose gear when the airplane is on the ground.
Training Information Point
You can push-to-test the parking brake-set light.
If the parking brake valve is not fully open with the parking brake lever released, these messages will show:
* ANTISKID advisory message
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PARKING BRAKE -FUNCTIONAL DESCRIPTION -CONTROL AND PARKING BRAKE-SET LIGHT INDICATION
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PARKING BRAKE SYSTEM -FUNCTIONAL DESCRIPTION -BRAKE-OFF AND BRAKE-ON LIGHT INDICATION
Brake-Off light Indication
The brake-off light turns on when the airplane is on the ground and the left and right pedal position switches are in the brakes not-applied position.
Brake-On Light Indication
The brake-on light turns on when the airplane is on the ground and the left and right brake metered pressure switches get high metered brake pressure input.
Training Information Point
You can push-to-test the brake-on and the brake-off lights.
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PARKING BRAKE SYSTEM -FUNCTIONAL DESCRIPTION -BRAKE-OFF AND BRAKE-ON LIGHT INDICATION
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777 AIRCRAFT MAINTENANCE MANUAL
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WHEELS, BRAKES, AND TIRES -INTRODUCTION
Main Landing Gear
Each main landing gear has a six wheel truck. A brake assembly is in each of the 12 main landing gear wheel and tire assemblies.
Nose Landing Gear
The nose landing gear has two wheel and tire assemblies. There are no hydraulic brakes for these wheels. Nose wheel spin brakes stop nose wheel rotation during retraction when the nose wheels enter the wheel well.
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777 AIRCRAFT MAINTENANCE MANUAL
WHEELS, BRAKES, AND TIRES -INTRODUCTION
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WHEELS, BRAKES AND TIRES -NOSE LANDING GEAR WHEEL AND TIRE
Nose Landing Gear Wheels
The nose wheels are radial tire wheels. They have forged inner and outer halves. Tie bolts hold the two halves together. Each wheel also has these components:
*
Tire inflation valve
*
Over-pressure relief valve
*
Tire pressure sensor (not shown).
Tire Inflation Valve
A tire inflation valve is in the outer wheel half.
Over-Pressure Relief Valve
An over-pressure relief valve is in the outer wheel half. The relief valve releases tire pressure more than 375-450 psig.
Tire Pressure Sensor
A tire pressure sensor in the outer wheel half sends tire pressure data to the tire pressure indication system.
Training Information Point
Install radial tires on the radial tire wheels only. The radial tire wheel width between the flanges is greater than bias ply tire wheels of the same size.
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