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STL 945.7136/97
A319/A320/A321 hydraulic system architecture
4.2
(*) only for A320
STL 945.7136/97
A319/A320/A321 hydraulic system - general
4.3
􀁺 Three fully independent systems : Green, Yellow,
Blue.
􀁺 Normal operation :
- two engine-driven pumps (one each - Green and
Yellow systems)
- one electric pump (Blue system)
􀁺 Abnormal operation :
- if engine No. 1 inoperative or Green pump failed :
then Green system pressurized by the reversible
Power Transfer Unit (PTU)
- if engine No. 2 inoperative or Yellow pump failed :
then Yellow system pressurized by the reversible
PTU
- if Yellow system pump inoperative and PTU failed :
then an electric pump will pressurize the Yellow
system.
- if case of dual engine failure or total electrical
power loss :
the Ram Air Turbine (RAT) will pressurize the Blue
system.
􀁺 On ground :
- Blue and Yellow systems may be pressurized by
electric pumps.
A handpump (operated from the ground on the
yellow system) facilitates manoeuvring of the cargo
doors.
- Green/Yellow system may be pressurized by the
PTU.

STL 945.7136/97
A319/A320/A321 hydraulic - control and display
4.5
System display :
HYD system page
Control panel
System label
System pressure
Power Transfer Unit
Yellow electrical pump
Fire valve position
RAT
Engine pump
Reservoir
quantity indication
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300kg

STL 945.7136/97
5. Flight controls
5.1

STL 945.7136/97
A319/A320/A321 EFCS advantages
5.3
The Electrical Flight Control System (EFCS) provides :
􀁺 Safety improvements (stall / windshear / overstress /
overspeed protection)
􀁺 Economical aspects
- weight saving = Δ W > 200kg considering the impact
on AFS
A319/A320/A321 plus same weight
gain on wing structure due to
integration of load alleviation function
function (A320 only).
- maintenance costs decreased
- training costs decreased
- production costs decreased
􀁺 Improvements in handling and comfort
- flight handling improvement
- new cockpit concept
STL 945.7136/97
A319/A320/A321 flight controls surfaces
5.4
Rudder
Elevator
Trimmable horizontal
stabilizer
Speed brakes
Roll spoilers
Lift dumpers
Load alleviation function
(only for A320)
Aileron
Flaps
Slats
STL 945.7136/97
A319/A320/A321 flight controls surfaces
5.5
􀁺 Control is achieved through conventional surfaces
􀁺 All the surfaces are hydraulically actuated
􀁺 Roll and pitch control is electrical :
- elevator
- ailerons
- roll spoilers
- trimmable horizontal stabilizers
- slats and flaps (single flap surfaces for A320 and
A319, double slotted surfaces for A321)
- speedbrakes / ground spoilers.
􀁺 Yaw control is mechanical :
- rudder (yaw damping, turn coordination and trim are
electrically ensured)
􀁺 Mechanical back up :
- trimmable horizontal stabilizers
STL 945.7136/97
A319/A320/A321 EFCS command principle
5.6
Commands
Elevator
Stabilizer
Ailerons
Spoilers
Rudder
Slats
Flaps
Electro / hydraulic
jacks
Digital
computers
Electrical
orders
Mechanical
back up
Autopilot
Sidestick
Slats/flaps
Rudder
pedals
SFCCs (2)
ELACS (2)
SECs (3)
FACs (2)
Hyd.
jacks
STL 945.7136/97
A319/A320/A321 EFCS computer
5.7
Flight control is achieved by three types of computer :
􀁺 Two ELACs (Elevator Aileron Computer) to ensure
commands of :
- normal elevator and stabilizer
- aileron
􀁺 Three SECs (Spoiler Elevator Computer)
- three computers achieve spoiler control
- two of them are devoted to standby elevator and
stabilizer control
􀁺 Two FACs (Flight Augmentation Computer)
Two computers which achieve electrical rudder control
and characteristics speeds calculation for displays on
PFD
.
In addition
- two SFCCs (Slats Flaps Control Computer)
- two FCDCs (Flight Control Data Concentrator)
acquire data from ELACs and SECs and send them
to ECAM and CFDS.

STL 945.7136/97
Classic and Fly-by-Wire (FBW) controls compared
5.9
Classic flight controls
􀁺 Directly proportional relationship between pilot stick
　
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