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following arming conditions are met :
‐ Green pressure available
‐ Antiskid electrically-powered
‐ No failure in the braking system
‐ At least two PRIMs and one ADIRU available
Note: Autobrake may be armed with the parking brake on.
SYSTEM ACTIVATION
Automatic braking activates by the ground spoiler extension command (Refer to DSC-27-20-30
PEDESTAL). In addition for MAX mode the nose landing gear compressed signal is required.
Consequently in the event of an acceleration stop, if the deceleration is initiated with the speed
below 72 kt, the automatic braking will not activate because the ground spoilers will not be
extended.
SYSTEM DEACTIVATION
The system deactivates :
‐ when it is disarmed (Refer to DSC-32-30-10-A AUTOBRAKE - SYSTEM DISARMING)
‐ when ground spoilers retract. In this case, it remains armed.
SYSTEM DISARMING
The system is disarmed by :
‐ Pressing the pushbutton, or
‐ Loss of one or more arming conditions, or
‐ Applying sufficient deflection to one brake pedal when autobrake is active in MAX, MED or LO
mode.
‐ After take-off/touch and go.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 5/8
FCOM 19 AUG 10
OPERATION
Applicable to: ALL
GENERAL
There are four operation modes :
‐ Normal braking
‐ Alternate braking with antiskid
‐ Alternate braking without antiskid
‐ Parking brake.
NORMAL BRAKING
Antiskid is operative and autobrake is available.
Normal braking is operative when :
‐ Green hydraulic pressure is available ;
‐ Main landing gear is on ground ;
‐ A/SKID and N/W STRG switch is ON
The control is electrically- achieved through the BSCU, either :
‐ Via the pedals, or
‐ Automatically on ground, by the autobrake system.
In flight by setting the landing gear lever to the up position.
The antiskid system is controlled by the BSCU, via the normal servovalves.
No brake pressure indication is provided.
ALTERNATE BRAKING WITH ANTISKID
Autobrake is inoperative.
Active when green hydraulic pressure is insufficient and provided :
Blue ‐ hydraulic pressure is available ;
‐ A/SKID and N/W STRG switch is ON ;
‐ PARKING BRAKE is not ON.
Note: Alternate braking is also active in flight, when the landing gear is up.
The automatic switching between the green and blue system is achieved by an automatic
hydraulic selector.
Control is achieved by the pedals through the auxiliary low hydraulic pressure distribution line
acting on the dual valves. The BSCU controls antiskid system via the alternate servo valves.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 6/8
FCOM 19 AUG 10
Brake pressure, as well as accumulator pressure, are indicated on a triple indicator located on the
center instrument panel.
ALTERNATE BRAKING WITHOUT ANTISKID
Autobrake and antiskid are inoperative.
The antiskid system is either deactivated :
‐ Electrically (A/SKID and N/W STRG switch OFF, or power supply failure, or BSCU failure), or
‐ Hydraulically (B + G system low pressure, the brakes are supplied by the brake accumulator
only).
Control is achieved by the pedals (acting on the dual valves).
Alternate servo valves are fully open.
Brake pressure has to be limited by the pilot by refering to the triple indicator to avoid wheel
locking.
Accumulators are designed to supply at least seven full brake applications.
PARKING BRAKE
Brakes are supplied by the blue hydraulic system, or by accumulator pressure via the dual shuttle
valves. Alternate servo valves are open allowing full pressure application.
The accumulator maintains the parking pressure for at least 12 h.
If the parking brake is activated and no blue hydraulic or accumulator brake pressure is available,
then the normal braking system can be applied via the brake pedals.
Blue accumulators can be pressurized by pressing the blue electrical pump switch. Brake
pressure, as well as accumulator pressure, are indicated on a triple indicator located on the center
instrument panel.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
A330/A340 FLEET DSC-32-30-10 P 7/8
FCOM 19 AUG 10
BRAKING SCHEMATIC
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
BRAKES AND ANTISKID - DESCRIPTION
Intentionally left blank
A330/A340 FLEET DSC-32-30-10 P 8/8
　
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