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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 21/22
FCOM 19 AUG 10
Applicable to:
SCHEMATIC
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 22/22
FCOM 19 AUG 10
Applicable to: ,
SCHEMATIC
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-10 P 1/2
FCOM 19 AUG 10
GENERAL
GENERAL
Applicable to: ALL
Flight control normal law provides:
‐ 3 Axis control
‐ Flight envelope protection
‐ Maneuver load alleviation
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
Intentionally left blank
A330/A340 FLEET DSC-27-20-10-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-20 P 1/8
FCOM 19 AUG 10
PITCH CONTROL
GROUND MODE
Applicable to:
Ground mode is active on ground. It is a direct relationship between the sidestick and elevator
deflection, without auto trim. The THS is automatically set at 5 ° up (inside the green band). Manual
setting according to CG has priority for take off.
The rotation maneuver is flown in direct law, with full authority.
Immediately after the aircraft becomes airborne, the flight mode is progressively blended in. The
reverse process occurs after touchdown.
GROUND MODE
Applicable to: ,
Ground mode is active on ground. It is a direct relationship between the sidestick deflection and
elevator deflection without auto trim. The THS is automatically set at 4 ° up (inside the green band).
Manual setting according to CG has priority for take off.
The rotation maneuver is flown in direct law, with full authority.
Immediately after the aircraft becomes airborne, the flight mode is progressively blended in. The
reverse process occurs after touchdown.
FLIGHT MODE
Applicable to: ALL
GENERAL
The normal law flight mode is a load factor demand law with auto trim and full flight envelope
protection.
In manual flight, it provides elevator and THS control from the sidestick controllers to achieve a
load factor proportional to stick deflection, independent of speed.
With the sidestick at neutral and the wings level, the system maintains 1 g in pitch corrected for
pitch attitude.There is no need for the pilot to trim with speed or configuration changes.
With the autopilot engaged, it provides elevator and THS control according to autopilot and load
factor demand. Pitch trim is automatic in both manual and autopilot mode.
In normal turns (up to 33 ° of bank), no pitch correction is required once the turn is established.
The flight mode is active from takeoff to landing, according to the logic (Refer to DSC-27-20-10-10
GENERAL).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-20 P 2/8
FCOM 19 AUG 10
Automatic pitch trim is frozen in the following cases:
‐ Manual trim order
‐ Radio altitude below 100 ft for flare
‐ Load factor lower than 0.5 g
‐ In high speed protection.
When the angle of attack protection is active, the THS is limited between setting at entry in
protection and 2 ° nose down (i.e. further nose up trim cannot be applied).
Similarly, when the load factor is higher than 1.3 g, or when the bank angle is outside ± 33 °, the
THS is limited between the actual setting and 2 ° nose down.
CONTROL WITH AUTOPILOT ENGAGED
‐ ___________The autopilot orders are limited by the PRIM
A force must be overcome to move the sidestick with the autopilot engaged. ‐ If the pilot moves
the sidestick to overcome this force, the autopilot will disconnect.
‐ All protections remain effective.
FLARE MODE
Applicable to: ALL
The flight mode changes to flare at landing, when passing 100 ft.
Flare mode is a direct stick-to-elevator relationship (with some damping provided by load factor and
pitch rate feedbacks). In addition, at 50 ft, a slight pitch down elevator order is applied, so that the
pilot has to move the stick rearwards to maintain a constant path, so as to reproduce conventional
aircraft aerodynamic characteristics.
PROTECTIONS
Applicable to: ALL
GENERAL
The normal law provides complete flight envelope protection as follow :
　
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