WHEELS AND BRAKES -INTRODUCTION
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WHEELS AND BRAKES -SUMMARY
General
The airplane rests on 14 wheels and tires.
Control for the brake system pressure comes from the hydro-mechanical, parking brake, and autobrake systems.
The antiskid system supplies protection to the tires from skid conditions.
The brake temperature monitor system shows brake temperature data on the flight deck.
The tire pressure indication system shows tire pressure data on the flight deck.
Wheels, Brakes, and Tires
There are two nose gear wheel and tire assemblies and six assemblies on each main gear truck.
The main wheel and tire assemblies use multiple-disc carbon brakes. The nose wheel and tire assemblies do not have hydraulic brakes.
Brake Hydro-Mechanical Control System
The hydro-mechanical control system controls hydraulic pressure to the brakes.
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The brake system has separate normal and alternate systems.
Brake pedal movement controls hydraulic pressure to the main landing gear brakes.
The brakes apply during landing gear retraction through the alternate brake metering valves.
Parking Brake System
The parking brake system latches the brake pedals in the brakes applied position.
Antiskid/Autobrake Systems
The antiskid system automatically decreases brake pressure to prevent tire skid conditions.
The autobrake system automatically applies hydraulic pressure to the brakes during landing or a rejected takeoff.
Brake Temperature Monitoring System (BTMS)
The BTMS monitors brake temperatures and shows brake temperature data on the landing gear synoptic display and the brake and steering maintenance page.
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WHEELS AND BRAKES -SUMMARY
Tire Pressure Indication System (TPIS)
The TPIS sends tire pressure signals from the 14 tires to the AIMS. The AIMS shows this data on the landing gear synoptic display and the brake and steering maintenance page.
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777 AIRCRAFT MAINTENANCE MANUAL
WHEELS AND BRAKES -SUMMARY
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
BRAKE HYDRO-MECHANICAL CONTROL -INTRODUCTION
Purpose
The brake hydro-mechanical system supplies manual control of the main landing gear brakes.
Brake hydraulic source selection uses two valves to automatically control different pressure sources to supply these brake functions:
*
Normal brakes
*
Alternate brakes
*
Reserve brakes
*
Accumulator brakes
*
Gear retract braking.
The brake pedals control the normal and the alternate brake systems.
Normal Brakes
When all the pressure sources are available, the normal brake system uses right hydraulic system pressure to operate the brakes.
Alternate Brakes
The alternate brake system uses center hydraulic system pressure to operate the brakes when right hydraulic system pressure is low.
Reserve Brakes
Reserve brakes use isolated center system pressure to pressurize the alternate brake system.
When the center hydraulic system reservoir is low, hydraulic system control isolates the output of the C1 ACMP for reserve brakes and nose wheel steering. This pump uses reserve fluid in the reservoir and pressurizes the alternate brake system.
Accumulator Brakes
When the normal, alternate, and reserve brake pressures are low, the accumulator pressurizes the normal brake system. The parking brake uses accumulator pressure when no other pressure sources are available.
Gear Retract Braking
The alternate brake system uses landing gear retract pressure to stop main gear wheel rotation during gear retraction.
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BRAKE HYDRO-MECHANICAL CONTROL -INTRODUCTION
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BRAKE HYDRO-MECHANICAL CONTROL -FLIGHT DECK COMPONENTS
Flight Deck Components
The hydro-mechanical control system includes these components on or near the flight deck:
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