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CHIME
MASTER
CAUT WHEEL NIL 3, 4, 5, 8
MEMO DISPLAY
When the nose wheel steering selector is in the towing position, this display shows “NW STRG
DISC” in green. The legend is amber if one engine is running.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - ELECTRICAL SUPPLY
A318/A319/A320/A321 FLEET DSC-32-20-40 P 1/2
FCOM 19 AUG 10
BUS EQUIPMENT LIST
Applicable to: ALL
NORM EMER ELEC
AC DC AC
ESS
DC
ESS HOT
BRAKES BBSSCCUU CCHH 12 AACC12 DDCC12
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - ELECTRICAL SUPPLY
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-32-20-40 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-32-30-10 P 1/16
FCOM 19 AUG 10
GENERAL
Applicable to:
The main wheels are equipped with carbon multidisc brakes, which can be actuated by either of two
independent brake systems.
The normal system uses green hydraulic pressure, whereas the alternate system uses the yellow
hydraulic system (backed up by the hydraulic accumulator).
An antiskid and autobrake system is also provided.
Braking commands come from either the brake pedals (pilot action), or the autobrake system
(deceleration rate selected by the crew).
Two units on each main gear monitor the temperature of the brakes.
All braking functions (normal and alternate braking control, anti-skid control, autobraking, brake
temperature indication) are controlled by a two-channel Brake and Steering Control Unit (BSCU).
The main wheels have fusible plugs that prevent the tires from bursting if they overheat.
The main wheels may also have brake cooling fans �� .
GENERAL
Applicable to:
,
,
MSN,,
4538,,
The main wheels are equipped with carbon multidisc brakes, which can be actuated by either of two
independent brake systems.
The normal system uses green hydraulic pressure, whereas the alternate system uses the yellow
hydraulic system (backed up by the hydraulic accumulator).
An antiskid and autobrake system is also provided.
Braking commands come from either the brake pedals (pilot action), or the autobrake system
(deceleration rate selected by the crew).
In normal operation, a dual channel Brake and Steering Control Unit (BSCU) controls normal braking
and antiskid.
Depending on the failure, braking may revert to :
Alternate braking with antiskid. This braking mode is controlled by ‐ the Alternate Braking Control
Unit (ABCU). The antiskid is controlled by the BSCU.
‐ Alternate braking without antiskid. This braking mode is fully-controlled by the ABCU.
‐ Alternate braking without antiskid on accumulator. This braking mode is fully-controlled by the
ABCU.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A318/A319/A320/A321 FLEET DSC-32-30-10 P 2/16
FCOM 19 AUG 10
All the normal and alternate braking components are fully-monitored. Any detected failure is signaled
to the crew via ECAM warnings.
The BSCU performs the following secondary functions :
‐ It checks the residual pressure in the brakes,
‐ It monitors the brake temperature,
‐ It provides discrete wheel speed information to other aircraft systems.
A changeover between the two BSCU channels takes place at each DOWN landing gear lever
selection, or in case one channel fails.
The main gear wheels are fitted with fusible plugs which protect against tire burst, in the event of
overheat.
Main gear wheels are also equipped with brake cooling fans �� , which permit a high speed cooling
of brakes.
ANTI-SKID SYSTEM
Applicable to:
The antiskid system provides maximum braking efficiency by maintaining the wheels at the limit of an
impending skid.
When a wheel is on the verge of locking, the system sends brake release orders to the normal and
alternate servovalves - and to the ECAM, which displays the released brakes.
The antiskid system is deactivated below 20 kt (ground speed).
An ON/OFF switch activates, or deactivates, the antiskid and nosewheel steering systems.
PRINCIPLE
The speed of each main gear wheel (given by a tachometer) is compared to the aircraft speed
(reference speed). When the speed of a wheel decreases below approximately 0.87 times
(depending on conditions) reference speed, brake release orders are given to maintain the wheel
　
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