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GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 4/22
FCOM 19 AUG 10
MECHANICAL CONTROL
Mechanical control of the THS is available from the pitch trim wheel at any time, if either the green
or yellow hydraulic system is functioning.
Mechanical control from the pitch trim wheel has priority over electrical control.
ACTUATION
ELEVATORS
‐ Two electrically-controlled hydraulic servojacks drive each elevator.
Each servojack has three control modes :
• Active : The jack position is electrically-controlled.
• Damping : The jack follows surface movement.
• Centering : The jack is hydraulically retained in the neutral position.
‐ In normal operation :
• One jack is in active mode.
• The other jack is in damping mode.
• Some maneuvers cause the second jack to become active.
‐ If the active servojack fails, the damped one becomes active, and the failed jack is
automatically switched to damping mode.
‐ If neither jack is being controlled electrically, both are automatically switched to the centering
mode.
‐ If neither jack is being controlled hydraulically, both are automatically switched to damping
mode.
‐ If one elevator fails, the deflection of the remaining elevator is limited in order to avoid putting
excessive asymmetric loads on the horizontal tailplane or rear fuselage.
STABILIZER
‐ A screwjack driven by two hydraulic motors drives the stabilizer.
‐ The two hydraulic motors are controlled by :
• One of three electric motors, or
• The mechanical trim wheel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 5/22
FCOM 19 AUG 10
SCHEMATIC
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 6/22
FCOM 19 AUG 10
ROLL CONTROL
Applicable to:
GENERAL
One aileron and four spoilers on each wing control the aircraft about the roll axis.
The maximum deflection of the ailerons is 25 °.
The ailerons extend 5 ° down when the flaps are extended (aileron droop).
The maximum deflection of the spoilers is 35 °.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 7/22
FCOM 19 AUG 10
Applicable to: ,
, MSN,,
GENERAL
One aileron and four spoilers on each wing control the aircraft about the roll axis.
The maximum deflection of the ailerons is 25 °.
The ailerons extend 5 ° down when the flaps are extended (aileron droop).
The maximum deflection of the spoilers is :
‐ 35 ° for spoilers 2, 4, and 5
‐ 7 ° for spoilers 3.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 8/22
FCOM 19 AUG 10
Applicable to:
MSN,
GENERAL
One aileron and four spoilers on each wing control the aircraft about the roll axis.
The maximum deflection of the ailerons is 25 °.
The ailerons extend 5 ° down when the flaps are extended (aileron droop).
The maximum deflection of the spoilers is 35 °.
Applicable to: ALL
ELECTRIC CONTROL
The ELAC ‐ 1 normally controls the ailerons.
If ELAC1 fails, the system automatically transfers aileron control to ELAC2.
If both ELACs fail, the ailerons revert to the damping mode.
‐ SEC3 controls the N° 2 spoilers, SEC1 the N° 3 and 4 spoilers, and SEC2 the N° 5 spoilers.
If a SEC fails, the spoilers it controls are automatically retracted.
Applicable to: ALL
ACTUATION
AILERONS
Each aileron has two electrically controlled hydraulic servojacks.
One of these servojacks per aileron operates at a time.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A318/A319/A320/A321 FLEET DSC-27-10-20 P 9/22
FCOM 19 AUG 10
Each servojack has two control modes :
Active : Jack position is controlled electrically
Damping : Jack follows surface movement.
The system automatically selects damping mode, if both ELACs fail or in the event of blue and
green hydraulic low pressure.
SPOILERS
A servojack positions each spoiler. Each servojack receives hydraulic power from either the
green, yellow, or blue hydraulic system, controlled by the SEC1, 2 or 3 (Refer to DSC-27-10-20
GENERAL ARCHITECTURE diagram).
　
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