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of Green hydraulic supply failure.
􀁺 Alternate braking system (Yellow hydraulic system
supply) :
- hydraullically controlled through dual valve
- individual wheel anti-skid control
- no autobrake function.
􀁺 Emergency braking system (Yellow hydraulic system
supply or Yellow brake power accumulator) :
- hydraulically controlled by pedals with brake
pressure indication on gauges
- no anti-skid control
􀁺 Parking brake (Yellow hydraulic system supply or
Yellow brake power accumulator) :
- electrically signaled
- hydraulically controlled with brake pressure
indication on gauges.
STL 945.7136/97
A319/A320/A321 landing gear – antiskid principle
6.6
BSCU 1
BSCU 2
Pedals depressed
autobrake activated
gear retraction
OR
LO MED MAX
Decel Decel Decel
on on on
Aircraft speed at
touchdown
(wheel tachy.)
Aircraft longitudinal
deceleration
(ADIRS)
γ prog
γ ir
Vo
Vo γ prog
Vo - γ ir. t
Autobrake
Off
On
V prog
Highest value
Vref
Wheel speed
Release order Normal
servo valve
Opening Normal
selector
valve
Green H.P.
STL 945.7136/97
A319/A320/A321 landing gear braking principle
6.7
Anti-skid system
􀁺 From touchdown, aircraft speed is computed based
on touchdown speed (wheels) and integrated
deceleration (ADIRS). This reference speed is
compared with each wheel speed to generate a
release order for closing the normal servo valve in
case of skid exceeding 13%.
􀁺 Brake pedals order results in opening this
servovalve also modulated by anti-ski closing
signals.
Autobrake system
􀁺 From touchdown a specific speed is computed
based on touchdown speed (wheels) and
programmed deceleration (low, medium, max). This
programmed speed is compared with each wheel
speed to generate a release order for closing the
normal servovalve to meet selected deceleration.
􀁺 If reference speed exceeds programmed speed
(contaminated or iced runways) the former will take
over for the anti-skid to modulate the normal servo
valve.
STL 945.7136/97
A319/A320/A321 landing gear - nose gear steering principle
6.8
Rudder pedal
disconnect
pushbutton
Auto pilot
ELA
C
OR
Green hydraulic supply Steering servo
valve
BSCU
One engine running
Towing lever
Normal position
MLG Compressed
A/SKID &
N/W STRG
and
STL 945.7136/97
A319/A320/A321 landing gear
6.9
Tyre pressure
psi (optional)
LDG door
Hottest brake
Anti-skid release
indicator
Ground spoiler
extension
Wheel system page landing roll
Gear downlock
indication Brake pressure
indication
(alternate system)
Autobrake panel and gear position indicator
(System 1)
Brake temp. °C
Autobrake
indication

STL 945.7136/97
7. Fuel system
7.1
STL 945.7136/97
A319/A320/A321 fuel system - ventilation
7.2
A319 / A320 A321
NACA intake
Flame arrestor
Pressure relief
outlets
Vent line Pressure relief outlets
Vent valve
Surge tank Outer cell Inner cell Center tank Surge tank Wing tank Center tank
NACA intake
Flame arrestor
Pressure relief
outlets
Vent line Pressure relief outlets
Vent valve
STL 945.7136/97
A319/A320/A321 fuel system – basic layout
7.3
􀁺 Total fuel capacity 􀁺 Ventilation
- Each tank is separately ventilated via surge tanks at
each wing tip.
- The center tank is ventilated via the LH surge tank.
- The surge tanks are opened to atmosphere via
flame arrestors and NACA inlets.
- Vent valves ensure correct operation of the vent
system.
- Pressure relief outlets protect the tanks from overor
under- pressure.
A319 / A320
Two outer cells
Two inner cells
One center tank
1 760 litres (1 408kg)
13 849 litres (11 079kg)
8 250 litres (6 600kg)
A321
Two wing tank
One center tank
15 500 litres (12 400kg)
8 200 litres ( 6 560kg)
(Weight calculated with a density of 0.8
An additional center tank (optional) increases the
total fuel capacity by 2 900 litres (2 320kg).
On the A319 Corporate Jet, up to 6 additional
center tanks can be added to increase the total
fuel capacity by up to 17 000 litres.
　
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