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SYSTEM ACTIVATION
Automatic braking activates :
when ‐ the ground spoilers extend (Refer to DSC-27-10-20-C SPEED BRAKES AND GROUND
SPOILERS - SPEED BRAKE CONTROL), for LO and MED mode.
‐ when the ground spoilers extend and the aircraft speed is greater than 40 kt, for MAX mode.
Therefore, if the aircraft makes an acceleration stop and begins to decelerate when its speed is
under 72 kt, the automatic braking will not activate because the ground spoilers will not extend.
For autobrake to activate, at least two SEC’s must be operative.
Applicable to: ALL
SYSTEM DEACTIVATION
The system deactivates :
‐ When it is disarmed (Refer to DSC-32-30-10-A AUTO BRAKE - SYSTEM DISARMING).
‐ When the ground spoilers retract. In this case it remains armed.
Applicable to: ALL
SYSTEM DISARMING
The system disarms when :
‐ Flight crew presses the pushbutton switch or,
‐ One or more arming conditions is lost or,
‐ Flight crew applies enough deflection to at least one brake pedal when autobrake is active in
MAX, MED or LO mode.
‐ After take-off/touch and go.
OPERATION - GENERAL
Applicable to: ALL
GENERAL
There are four modes of operation :
‐ Normal braking,
‐ Alternate braking with antiskid,
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 10/16
FCOM 19 AUG 10
‐ Alternate braking without antiskid,
‐ Parking brake.
Applicable to: ALL
NORMAL BRAKING
Braking is normal when :
‐ Green hydraulic pressure is available.
‐ The A/SKID & N/W STRG switch is ON.
During normal braking, antiskid operates and autobrake is available.
Braking is electrically-controlled through the BSCU :
‐ From the pilot’s pedals, or
‐ Automatically :
• On ground by the autobrake system,
• In flight when the landing gear lever is up.
The antiskid system is controlled by the BSCU via the normal servo valves.
There is no brake pressure indication in the cockpit.
Applicable to:
ALTERNATE BRAKING WITH ANTI-SKID
Braking uses this mode when green hydraulic pressure is insufficient and :
‐ Yellow hydraulic pressure is available.
‐ The A/SKID & N/W STRG switch is ON.
‐ The parking brake is not ON.
An automatic hydraulic selector changes from the green to the yellow system.
The pedals brake through the auxiliary low-pressure hydraulic distribution line acting on the dual
valves. The BSCU controls the anti-skid system via the alternate servo valves.
A triple indicator on the center instrument panel shows the pressure delivered to the left and right
brakes, as well as the accumulator pressure.
Autobrake is inoperative.
Applicable to:
,
,
MSN,,
4538,,
ALTERNATE BRAKING WITH ANTI-SKID
Autobrake is inoperative.
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 11/16
FCOM 19 AUG 10
Braking uses this mode when green hydraulic pressure is insufficient and :
‐ Yellow hydraulic pressure is available.
‐ The A/SKID & N/W STRG switch is ON.
‐ The parking brake is not ON.
Braking inputs are made by the brake pedals and sent to the ABCU. Then, taking into account the
brake pedal input, the ABCU:
‐ Energizes the alternate brake selector valve to pressurize the yellow hydraulic circuit,
‐ Electrically controls the Alternate Servo Valve to obtain the correct pressure for the related
brakes.
Antiskid is controlled by the BSCU.
Brake pressure, as well as accumulator pressure, are indicated on a triple indicator located on the
center instrument panel.
Applicable to:
ALTERNATE BRAKING WITHOUT ANTI-SKID
The anti-skid system can be deactivated :
electrically (A/SKID & N/W STRG switch OFF, or power ‐ failure or BSCU failure),
‐ hydraulically (low pressure in both green and yellow systems, brakes being supplied by the
brake accumulator only).
The pilot controls the braking with the pedals (acting on the dual valves).
Alternate servo valves are fully open.
The pilot must refer to the triple indicator to limit brake pressure in order to avoid locking a wheel.
The accumulator can supply at least 7 full brake applications.
Autobrake is inoperative.
Applicable to:
,
,
MSN,,
4538,,
ALTERNATE BRAKING WITHOUT ANTI-SKID
Autobrake and antiskid are inoperative.
The antiskid system is either deactivated :
‐ Electrically (A/SKID & N/W STRG switch OFF, or power supply failure, or BSCU failure), or
　
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