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ALTERNATE SERVOVALVES
The alternate servovalves regulate only the anti-skid
control pressure.
They are located on the rear pressure bulkhead above
the main landing gear strut.
PARKING BRAKE CONTROL VALVE
The parking brake electrical control valve is operated
by the parking brake handle. It deactivates anti-skid
and braking modes.
PARKING BRAKE OPERATED VALVE
The parking brake operated valve shuts off supply to
the alternate brake system to prevent leakage through
the dual valve.
ACCUMULATOR
The accumulator is only used for braking. It is either
pressurized by the yellow hydraulic system or by the
yellow electric pump.
TMULDZZ02-T01 LEVEL 3
EFFECTIVITY 32-40-00 Page 4
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 154
ALL
32 - LANDING GEAR
32-42-00 WHEELS AND BRAKES - AUTO BRAKE
SYSTEM DESCRIPTION/OPERATION
CONTENTS:
Auto Brake Modes
ADIRS
A/SKID & N/W STRG Switch
Arming
Activation
Disarming
Self Examination
TMULDG902 LEVEL 3
EFFECTIVITY 32-42-00 Page 1
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 155
ALL
WHEELS AND BRAKES - AUTO BRAKE SYSTEM DESCRIPTION/OPERATION
AUTO BRAKE MODES
The AUTO BRK panel is used to select the desired
deceleration rate of the system.
MAX mode is normally selected for take-off: In the
event of an aborted take-off, maximum braking pressure
is sent to the normal servovalves as soon as ground
spoilers deployment order is present.
MED or LO modes are selected for landing: Progressive
pressure is sent to the brakes, for respectively 2 or4
seconds after the ground spoilers deployment order.
ADIRS
The Air Data Inertial Reference System (ADIRS) signals
the aircraft deceleration rate to the Braking and
Steering Control Unit (BSCU) to be compared with the
selected deceleration mode for braking computation.
A/SKID & N/W STRG SWITCH
The A/SKID & N/W STRG switch activates the anti-skid
system and enables auto brake arming.
ON: Anti-skid and nose wheel steering are available
and auto brake can be armed provided the green pressure
is valid.
If green pressure drops:
- Yellow pressure takes over automatically,
anti-skid is available and nose wheel steering
is lost.
- Auto brake cannot be armed.
OFF: Anti-skid, nose wheel steering and auto brake are
lost.
ARMING
The auto brake system is armed if one of the three
mode pushbuttons (LO, MED or MAX) is pressed in and
the following conditions are met:
- Green pressure available.
- Anti-skid electrically powered.
- No failure in the normal braking system.
The ON light comes on blue when the corresponding rate
is armed.
ACTIVATION
The automatic braking system is activated by 2 of the
3 ground spoiler extension signals coming from the
Spoiler Elevator Computers (SECs).
The DECEL light comes on green when actual aircraft
deceleration is 80 % of selected rate (LO and MED
modes) or 0.27 g (MAX mode).
DISARMING
The auto brake is disarmed by:
- Releasing the selected pushbutton out or,
- Loss of one or more arming conditions or,
- Applying sufficient force to the pedals when
auto brake is operating.
- Ground spoiler retraction.
TMULDG902-T01 LEVEL 3
EFFECTIVITY 32-42-00 Page 2
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 156
ALL
AUTO BRAKE SYSTEM DESCRIPTION/OPERATION
TMULDG902-P01 LEVEL 3
EFFECTIVITY 32-42-00 Page 3
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 157
ALL
SELF EXAMINATION
In which mode is progressive pressure sent to the
brakes, 2 seconds after ground spoiler deployment:
A - MAX mode.
B - MED mode.
C - LO mode.
What are the auto brake arming conditions?
A - An AUTO BRK pushbutton pressed in, green
pressure and anti-skid powered and no
failure in normal braking system.
B - An AUTO BRK pushbutton pressed in,
yellow pressure and anti-skid powered
and no failure in normal braking system.
C - An AUTO BRK pushbutton pressed in, green
pressure and anti-skid deactivated and
no failure in normal braking system.
TMULDG902 LEVEL 3
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