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With the accumulator pressure only, a maximum of 7
full brake pedal applications can be performed.
TMULDZ101-T06 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 12
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 148
ALL
BRAKE SYSTEM PRESENTATION - ALTERNATE BRAKING WITHOUT ANTI-SKID
TMULDZ101-P06 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 13
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 149
ALL
SELF EXAMINATION
Which hydraulic system powers normal braking ?
A - Green system.
B - Yellow system.
C - Blue system.
How is inflight braking initiated ?
A - By setting the landing lever to the UP
position.
B - By shock absorber extension.
C - By auto brake deactivation.
In case of normal braking system failure, how is
alternate braking applied ?
A - Automatically when the selector valve is
de-energized.
B - Automatically through the automatic
selector.
C - As soon as the brake pedals are pressed
in.
How can the parking brake be hydraulically powered ?
A - Only by yellow high pressure.
B - Only by the brake accumulator.
C - Either by yellow high pressure or by the
brake accumulator.
TMULDZ101 LEVEL 1
EFFECTIVITY
ALL 32-40-00 Page 14
Feb 29/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 150
ALL
32 - LANDING GEAR
32-40-00 WHEELS AND BRAKES - BRAKE SYSTEM
DESCRIPTION
CONTENTS:
Pedals
Brake Pedals XMTR Unit
BSCU
Selector Valve
Normal Servovalve
Wheels
Automatic Selector
Auxiliary Low Pressure Control System
Dual Valve
Dual Shuttle Valve
Alternate Servovalve
Parking Brake Control Valve
Parking Brake Operated Valve
Accumulator
TMULDZZ02 LEVEL 3
EFFECTIVITY 32-40-00 Page 1
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 151
ALL
WHEELS AND BRAKES - BRAKE SYSTEM DESCRIPTION
PEDALS
The pedals give mechanical inputs to the brake pedal
transmitter unit for manual normal braking and to the
auxiliary low pressure control system for alternate
braking.
BRAKE PEDALS XMTR UNIT
The brake pedal transmitter unit transforms the
mechanical input from the right and left pedals into
electrical signals which are sent to the BSCU.
BSCU
The Braking and Steering Control Unit (BSCU) controls
normal braking, auto braking as well as anti-skid
operation during normal and alternate braking.
SELECTOR VALVE
The selector valve is an on/off valve. When normal
braking is applied, the BSCU first energizes the
selector valve, this allows full green pressure to
supply the normal servovalves.
NORMAL SERVOVALVES
The normal servovalve has a dual function: it regulates
braking pressure, which depends on BSCU braking orders,
and anti-skid control pressure delivered to the brakes.
They are located on the main landing gear strut.
WHEELS
Each main wheel is equipped with multidisc carbon
brakes.
Each main wheel rotation speed given by a tachometer
is fed back to the BSCU for anti-skid computation.
AUTOMATIC SELECTOR
The automatic selector allows the pressurization of
either normal brake systems or alternate brake systems
and preferential supply to the normal system.
AUXILIARY LOW PRESSURE CONTROL SYSTEM
The auxiliary low pressure control system transforms
the mechanical input from the left and right pedals
into hydraulic pressure which controls the dual valve.
DUAL VALVE
The dual valve allows the operation of the alternate
braking system.
DUAL SHUTTLE VALVE
The dual shuttle valve selects either the alternate
braking system or the parking brake system.
TMULDZZ02-T01 LEVEL 3
EFFECTIVITY 32-40-00 Page 2
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 152
ALL
BRAKE SYSTEM DESCRIPTION
TMULDZZ02-P01 LEVEL 3
EFFECTIVITY 32-40-00 Page 3
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 153
ALL
WHEELS AND BRAKES - BRAKE SYSTEM DESCRIPTION
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