Main Landing Gear Of B777.

Main Landing Gear Of B777.

Functions are defined here!

Features

TRICYCLE LANDING GEAR

The tricycle landing gear has two

main landing gear under the wings

and one nose landing gear.

HYDRAULIC ACTUATION

The landing gear operates with

center hydraulic system pressure.

During normal operation, valves

control the sequence of operation.

An alternate gear extension system

extends the landing gear without

center hydraulic system pressure.

When the landing gear is fully

retracted in flight, valves

automatically remove hydraulic

pressure from the landing gear.

ELECTRICAL CONTROL OF

LANDING GEAR

The landing gear control lever has

two positions and electrically controls

the landing gear selector valves for

landing gear operation.

PROXIMITY SENSOR SYSTEM

The proximity sensor system

monitors the position of the proximity

sensors and supplies signals to show

the position of the landing gear and

other aircraft systems.

AIR/GROUND SYSTEM

Load sensors monitor the weight of

the aircraft on the landing gear and

supply signals for air/ground

detection. Many aircraft systems use

these air/ground signals. Nose gear

and main truck proximity sensors

also supply air/ground signals for

some limited functions.

SIX WHEELS ON THE MAIN

TRUCKS

Each main landing gear truck has

six wheels.

MAIN GEAR STEERING

The aft axles of the main gear trucks

pivot to help the nose gear steer the

airplane. This helps to decrease the

turn radius and tire scrub.

CARBON BRAKES

All wheels of the main landing gear

trucks have carbon brakes for

reduced weight and longer life.

BRAKE SYSTEM CONTROL UNIT

A brake system control unit (BSCU)

controls antiskid and autobrake

operation and other brake system

functions.

TAXI BRAKE RELEASE

During low taxi speed, the BSCU

releases two brakes on each truck.

This decreases brake and tire wear.

BRAKE INDICATIONS

Lights on the nose gear show if the

brakes and the parking brake are

applied.

TAIL STRIKE INDICATION

A tail strike assembly (TSA) on the

bottom of the aft part of the fuselage

sends signals to the PSEUs if a tail

strike occurs.

OTHER FEATURES

Other features include a brake

temperature monitor system, a tire

pressure indicating system, and an

optional brake cooling system.

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