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A319/A320/A321 EFCS speed brakes and ground spoilers
5.32
􀁺 Speed brakes
- Achieves by three surfaces
- When the sum of a roll order and a simultaneous
speed brake order on either surface is greater
than the maximum deflection achievable, the
symmetrical surface is retracted until the
difference between both corresponding surfaces
is equal to the roll order.
􀁺 If engine power is above idle, an amber message is
displayed on ECAM.
􀁺 Speedbrakes are automatically retracted when :
- selection of flaps configuration FULL for A320 and
A319 (or 3 or FULL for A321)
- AOA protection is active
􀁺 Ground spoilers
- Preselection achieved :
with control handle in the armed position and
idle thrust selected, or
by selecting reverse thrust
- Maximal extension (50°) of all surfaces then
automatically achieved when wheels speed
>72kt.
RET
1/2
FULL FULL
1/2
RET
SPEED
BRAKE
•
•
STL 945.7136/97
A319/A320/A321 EFCS - flaps and slats control
5.33
- The flaps lever selects simultaneous operation of
the slats and flaps.
- The five positions of the lever correspond to the
following surfaces positions and flight phases :
Position Slats Flats Flight phases
0
1
2
3
0°
18°
22°
22°
0°
0°
10°
15°(14°)
20°
35°(*) (25°)
Cruise / Hold
Hold / Approach
Approach
Approach / landing
(21°)
FULL 27° Landing
(*) : 40° for A320 with IAE engine or A319
() : setting for A321
- Computed by FACs, retraction speeds are
presented on PFDs for :
minimum flaps retraction or F -speed,
minimum slats retraction or S -speed.
•
•
FLAPS
Take
off
STL 945.7136/97
A319/A320/A321 EFCS controls
5.34
FLT CTL
ELAC 1 SEC 1 FAC 1
FLT CTL
ELAC 2 SEC 2 SEC 3 FAC 2
SPEED FLAPS
BRAKE
STL 945.7136/97
A319/A320/A321 EFCS indications
5.35
Slats/flaps indication
ECAM upper display
ECAM lower display
F / CTL page
Hydraulic system pressure indication
Computers
Rudder position
Spoilers / speedbrakes
Ailerons position
Ailerons actuators
Pitch trim position
Elevator position

STL 945.7136/97
6. Landing gear
6.1

STL 945.7136/97
A319/A320/A321 landing gear
6.3
Main feature
􀁺 Conventional tricycle or bogie (option) landing gear
and direct-action shock absorbers.
􀁺 Main gear retracts laterally and nose gear forward
into the fuselage.
􀁺 Electrically controlled by two Landing Gear
Control/Interface Units (LGCIU).
􀁺 Hydraulically actuated with alternative free-fall/spring
downlock mode
􀁺 Alternating use of both LGCIUs for each
retraction/extension cycle.
􀁺 In the event of one LGCIU failure, resetting the
landing gear control lever results in transition to the
other LGCIU.
􀁺 Elimination of gear lever neutral position through
automatic depressurization of landing gear hydraulic
supply above 260kt.
􀁺 Elimination of microswitches by use of trouble-free
proximity detectors for position sensing.
Braking system
The Braking and Steering Control Unit (BSCU) is a fully
digital dual-channel computer controlling the following
functions :
- normal braking system control
- anti-skid control (normal and alternate)
- auto brake function with LO, MED, MAX
- nosewheel steering command processing
- monitoring of all these functions
STL 945.7136/97
A319/A320/A321 landing gear - braking system
6.4
BSCU
Normal
selector valve
Green
HP
Accu Yellow
HP
Automatic
selector
To other
wheels
Normal
servo valve
Dual shuttle
valve
To opposite
wheel
To ECAM
Accumulator
pressure
Control valve
parking brake
To other gear
To other side
dual valve
Auxiliary LP distribution line
Pedals
STL 945.7136/97
A319/A320/A321 landing gear - braking system
6.5
􀁺 Carbon disk brakes are standard.
􀁺 Normal system (Green hydraulic system supply) :
- electrically signalled through anti-skid valves
- individual wheel anti-skid control
- autobrake function
- automatic switchover to alternate system in event
　
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