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CONTROL SURFACES
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - GENERAL
A330/A340 FLEET DSC-27-10-10 P 3/10
FCOM 19 AUG 10
The flight controls are electrically or mechanically controlled as follows :
PITCH AXIS
Elevator control = Electrical
Stabilizer control = Electrical for normal or alternate control. Mechanical for manual trim control
ROLL AXIS
Aileron control = Electrical
Spoiler control = Electrical
YAW AXIS
Rudder control = Mechanical, however control for yaw damping, turn coordination and trim is
electrical.
OTHER CONTROLS
Speedbrakes = Electrical
Note: All surfaces are hydraulically-actuated.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - GENERAL
A330/A340 FLEET DSC-27-10-10 P 4/10
FCOM 19 AUG 10
CONTROL SURFACES
Applicable to: ,
PITCH AXIS
Elevator control = Electrical
Stabilizer control = Electrical for normal or alternate control. Mechanical for manual trim control
ROLL AXIS
Aileron control = Electrical
Spoiler control = Electrical
YAW AXIS
Rudder control = Electrical
OTHER CONTROLS
Speedbrakes = Electrical
Note: All surfaces are hydraulically-actuated.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - GENERAL
A330/A340 FLEET DSC-27-10-10 P 5/10
FCOM 19 AUG 10
COCKPIT CONTROLS
Applicable to:
Two sidestick controllers are used for pitch and roll manual control. ‐ One is on the CAPT's lateral
console, the other is on the FO's lateral console.
The two controllers are springloaded to neutral, and are not mechanically coupled.
Each controller independently sends electrical signals to the flight control computers.
‐ Two pairs of rigidly interconnected pedals ensure mechanical control of the rudder.
‐ A speedbrake control lever is provided in the center pedestal.
‐ Two handwheels, on the center pedestal, are used to mechanically control the THS.
‐ A switch, installed on the center pedestal, ensures the rudder trim control.
‐ No manual aileron trim switch is provided.
COCKPIT CONTROLS
Applicable to: ,
‐ Two sidestick controllers are used for pitch and roll manual control. One is on the CAPT's lateral
console, the other is on the FO's lateral console.
The two controllers are springloaded to neutral, and are not mechanically coupled.
Each controller independently sends electrical signals to the flight control computers.
‐ Two pairs of rigidly interconnected pedals ensure electrical control of the rudder.
A speedbrake control lever ‐ is provided in the center pedestal.
‐ Two handwheels, on the center pedestal, are used to mechanically control the THS.
‐ A switch, installed on the center pedestal, ensures the rudder trim control.
‐ No manual aileron trim switch is provided.
COMPUTERS
Applicable to: ALL
GENERAL
Five flight control computers process pilot and autopilot inputs according to normal, alternate or
direct flight control laws.
The computers are :
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - GENERAL
A330/A340 FLEET DSC-27-10-10 P 6/10
FCOM 19 AUG 10
Applicable to:
3 PRIM computers
(Flight Control Primary Computer – FCPC), each of which is used for :
‐ Normal, alternate, and direct control laws.
‐ Speedbrake and ground spoiler control.
‐ Protection speed computation.
Applicable to: ,
3 PRIM computers
(Flight Control Primary Computer – FCPC), each of which is used for :
‐ Normal, alternate, and direct control laws.
‐ Speedbrake and ground spoiler control.
‐ Protection speed computation.
‐ Rudder travel limit.
Applicable to: ,
2 SEC computers
(Flight Control Secondary Computer – FCSC) for :
‐ Direct control laws, including yaw damper function.
‐ Rudder trim, and rudder travel limit.
One computer of any type is capable of controlling the aircraft and of assuring safe flight and
landing.
In normal operation, one PRIM computer is declared to be the master (P1). It processes the orders
and sends them to the other computers (P1 / P2 / P3 / S1 / S2), which will then execute them on
their related servo-control.
If one computer is unable to execute the orders sent by the master, another computer executes
the task of the affected computer (except for spoiler control).
If the master computer (P1) cannot be the master, then P2 (or P3, if P2 is not available) becomes
the master.
Note: When the green hydraulic system is lost, P2 replaces P1 as the master computer.
　
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