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structure loads.
The high hydraulic demands required to achieve the rapid surface movements are provided with the
help of dedicated hydraulic accumulators.
The LAF becomes active when the difference between aircraft load factor and pilot demanded load
factor exceeds 0.3 g, in which case :
‐ The ailerons are deflected symmetrically upwards (order computed by the ELACs) :
Maximum 10 ° added to roll demand, if any.
‐ The spoilers 4 and 5 are deflected symmetrically (order computed by the SECs) :
Maximum 25 ° added to roll demand, if any.
The load alleviation is inhibited with :
• Slats or flaps extended ;
• Speed below 200 kt, or above VMO +10 kt, or
• Slats/flaps wing tip brake engaged.
• Pitch alternate law without protection, or with direct law.
If normal law cannot be achieved, a degraded law is provided :
‐ In case of ELAC (only one servojack is operated), aileron servojack or LAF accumulator failure,
the aileron deflection rate is reduced by about 60 %.
‐ In case of SEC, spoiler 4 or 5 servojack or LAF accumulator failure, the LAF of affected spoiler is
lost. Aileron LAF remains normal.
In both cases, the ECAM F/CTL page displays a “LAF DEGRADED” message.
In case of total loss of LAF (normal and degraded laws) “LAF” message is displayed in INOP SYS on
ECAM STATUS page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A318/A319/A320/A321 FLEET DSC-27-20-10-50 P 1/2
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SIDESLIP TARGET
SIDESLIP TARGET
Applicable to: ALL
If one engine fails, the FAC modifies the sideslip indication slightly to show the pilot how much rudder
to use to get the best 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).
The pilot’s response is normal and instinctive : zero the slip indication by applying the right amount of
rudder to get the best climb performance.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
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A318/A319/A320/A321 FLEET DSC-27-20-10-50 P 2/2
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - RECONFIGURATION CONTROL LAWS
A318/A319/A320/A321 FLEET DSC-27-20-20 P 1/10
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Depending on the failures occuring to the flight control system, or on its peripherals, there are 3
levels of reconfiguration :
‐ Alternate law
They are two levels of alternate law : with and without reduced protections.
‐ Direct law
‐ Mechanical
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - RECONFIGURATION CONTROL LAWS
A318/A319/A320/A321 FLEET DSC-27-20-20 P 2/10
FCOM 19 AUG 10
FLIGHT CONTROLS LAW RECONFIGURATION
Applicable to: MSN,
4473
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - RECONFIGURATION CONTROL LAWS
A318/A319/A320/A321 FLEET DSC-27-20-20 P 3/10
FCOM 19 AUG 10
FLIGHT CONTROLS LAW RECONFIGURATION
Applicable to:
, ,
MSN,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - RECONFIGURATION CONTROL LAWS
A318/A319/A320/A321 FLEET DSC-27-20-20 P 4/10
FCOM 19 AUG 10
ALTERNATE LAW
Applicable to: ALL
PITCH CONTROL
GROUND MODE
Under alternate law the ground mode becomes active on the ground five seconds after
touchdown.
It is identical to the ground mode of the normal law.
FLIGHT MODE
In flight, the alternate law pitch mode follows a load-factor demand law much as the normal law
pitch mode does, but it has less built-in protection (reduced protections).
FLARE MORE
In pitch alternate law the flight mode changes to the flare mode when the pilot selects landing
gear down. The flare mode is a direct stick-to-elevator relationship. (Refer to DSC-27-20-20
DIRECT LAW).
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 3(32)
