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
领英推荐
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.