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A330/A340 FLEET DSC-27-20-10-20 P 8/8
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-30 P 1/4
FCOM 19 AUG 10
LATERAL CONTROL
LATERAL NORMAL LAW
Applicable to:
When the aircraft is on the ground (in “on ground” mode), the sidestick commands the aileron and roll
spoiler surface deflection. The amount of control surface deflection that results from a given amount
of sidestick deflection depends upon aircraft speed. The pedals control rudder deflection .through a
direct mechanical linkage.
When the aircraft is in the “in flight” mode, normal law combines control of the ailerons, spoilers
(except N° 1 spoilers), and rudder (for turn coordination) in the sidestick. While the system thereby
gives the pilot control of the roll and heading, it also limits the roll rate and bank angle, coordinates
the turns, and damps the dutch roll.
The roll rate requested by the pilot during flight is proportional to the sidestick deflection, with a
maximum rate of 15 °/s when the sidestick is at the stop.
When the aircraft is in “flare” mode, the lateral control is the same as in “in flight” mode.
LATERAL NORMAL LAW
Applicable to: ,
When the aircraft is on the ground (in “on ground” mode), the sidestick commands the aileron and roll
spoiler surface deflection. The amount of control surface deflection that results from a given amount
of sidestick deflection depends upon aircraft speed. The pedals control rudder deflection.
When the aircraft is in the “in flight” mode, normal law combines control of the ailerons, spoilers
(except N° 1 spoilers), and rudder (for turn coordination) in the sidestick. While the system thereby
gives the pilot control of the roll and heading, it also limits the roll rate and bank angle, coordinates
the turns, and damps the dutch roll.
The roll rate requested by the pilot during flight is proportional to the sidestick deflection, with a
maximum rate of 15 °/s when the sidestick is at the stop.
BANK ANGLE PROTECTION
Applicable to: ALL
Inside the normal flight envelope, the system maintains positive spiral static stability for bank angles
above 33 °. If the pilot releases the sidestick at a bank angle greater than 33 °, the bank angle
automatically reduces to 33 °. Up to 33 °, the system holds the roll attitude constant when the
sidestick is at neutral. If the pilot holds full lateral sidestick deflection, the bank angle goes to 67 °
(indicated by a pair of green bar lines “=” on the PFD) and no further.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-30 P 2/4
FCOM 19 AUG 10
If the angle-of-attack protection or high speed protection, is operative, the bank angle goes to 45 °
and no further, if the pilot holds full lateral sidestick deflection. If high speed protection is operative,
the system maintains positive spiral static stability from a bank angle of 0 °, so that with the sidestick
released, the aircraft always returns to a bank angle of 0 °.
When bank angle protection is active, auto trim is inoperative.
If the bank angle exceeds 45 °, the autopilot disconnects and the FD bars disappear. The FD bars
return when the bank angle decreases to less than 40 °.
SIDESLIP TARGET
Applicable to: ALL
Should an engine failure occur, the sideslip indication is slightly modified to ensure that optimum pilot
rudder application is made to achieve optimum climb performance (ailerons to neutral and spoilers
retracted).
In the case of an engine failure at takeoff, or at go-around, the sideslip index on the PFD changes
from yellow to blue (to provide the conditions for the blue display of the sideslip target, Refer to
DSC-31-40 ATTITUDE DATA).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-30 P 3/4
FCOM 19 AUG 10
Crew response is normal and instinctive :
Zero, the beta target value for optimum performance ‐ with appropriate rudder application.
‐ Accelerate if beta target cannot be zeroed with full rudder.
The computation is made by the PRIM.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
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A330/A340 FLEET DSC-27-20-10-30 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(143)
