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MEMO DISPLAY
Applicable to:
If the nose wheel steering switch is in the towing position, the N/WS DISC message is displayed in
green. It becomes amber if two engines are running.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - WARNINGS AND CAUTIONS
A330/A340 FLEET DSC-32-20-30 P 2/2
FCOM 19 AUG 10
MEMO DISPLAY
Applicable to: ,
If the nose wheel steering switch is in the towing position, the N/WS DISC message is displayed in
green. It becomes amber if one engine is running.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - ELECTRICAL SUPPLY
A330/A340 FLEET DSC-32-20-40 P 1/2
FCOM 19 AUG 10
BUS EQUIPMENT LIST
Applicable to:
NORM EMER ELEC
AC DC DC
BAT
AC
ESS
DC
ESS HOT
NWS OVERSTEER WARNING �� DC1 HOT 1(1)
(1) Or the tow tractor power supply.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - ELECTRICAL SUPPLY
Intentionally left blank
A330/A340 FLEET DSC-32-20-40 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 1/8
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
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, whilst the alternate system uses the blue
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).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 2/8
FCOM 19 AUG 10
All braking functions (normal and alternate braking control, autobraking, antiskid control) are
controlled by a dual channel Brake and Steering Control Unit (BSCU).
The BSCU performs the following secondary functions :
It checks for ‐ residual pressure in the brakes,
‐ It monitors brake temperature,
‐ It provides discrete wheel speed information to other aircraft systems.
A changeover between the two BSCU systems takes place at each DOWN landing lever selection, or
in case one system fails.
The main and center gear wheels are fitted with fuse plugs which prevent tires from bursting, in the
event of an overheat.
Main gear wheels are also equipped with brake cooling fans �� , which permit a higher cooling
speed of the brakes.
ANTISKID SYSTEM
Applicable to: ALL
The antiskid system provides maximum braking efficiency by maintaining the wheels at the limit of an
impending skid.
At skid onset brake release orders are sent to the normal and to the alternate servovalves as well as
to the ECAM system which displays the released brakes.
Full braking performance is achieved only with brakes pedals at full deflection.
The antiskid system is deactivated below 10 kt (ground speed).
An ON/OFF switch activates or deactivates the antiskid system and nose wheel steering.
PRINCIPLE
Applicable to: ALL
The speed of each main gear wheel (given by a tachometer) is compared with the aircraft speed
(reference speed). When the speed of a wheel decreases below 0.88 time reference speed, brake
release orders are given to maintain the wheel slip at that value (best braking efficiency).
In normal operation, the reference speed is determined by BSCU from the horizontal acceleration
from ADIRU 1 or ADIRU 2 or ADIRU 3.
In case all ADIRUs are failed, reference speed equals the maximum of either main landing gear
wheel speeds. Deceleration is limited to a default value of 2.5 m/s² (8.2 ft/s²).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 3/8
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 4/8
FCOM 19 AUG 10
AUTOBRAKE
Applicable to: ALL
The aim of this system is :
To reduce the braking ‐ delay in the event of an accelerate-stop to improve performance.
‐ To establish and maintain a selected deceleration rate during landing, to improve comfort and
reduce crew workload.
SYSTEM ARMING
The crew may arm the system by pressing the LO, MED, or MAX pushbutton provided all the
　
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