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DSC-22_40-40 WINDSHEAR DETECTION FUNCTION
WINDSHEAR DETECTION FUNCTION...............................................................................................................1/2
WINDSHEAR DETECTION PRINCIPLES............................................................................................................1/2
GUIDANCE..........................................................................................................................................................1/2
DSC-22_40-50 CONTROLS AND INDICATORS
FAC ENGAGEMENT...........................................................................................................................................1/2
RUDDER TRIM OPERATION.............................................................................................................................1/2
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
PRELIMINARY PAGES - TABLE OF CONTENTS
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FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
GENERAL
A318/A319/A320/A321 FLEET DSC-22_40-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The aircraft has two flight augmentation computers (FACs) that perform four main functions:
• Yaw function
Yaw damping ‐ and turn coordination
‐ Rudder trim
‐ Rudder travel limitation
• Flight envelope function
‐ PFD speed scale management
▪ Minimum/maximum speed computation
▪ Maneuvering speed computation
‐ Alpha-floor protection
• Low-Energy Warning function ��
• Windshear detection function ��
In performing these functions the FAC uses independent channels :
Yaw damper
Rudder trim
Rudder travel limit
Flight envelope
Each FAC interfaces with the elevator aileron computers (ELACs) when the APs are disengaged, or
with the FMGS when at least one AP is engaged.
Both FACs engage automatically at power-up.
The pilot can disengage or reset each FAC (in case of failure) by means of a pushbutton on the flight
control overhead panel.
When a FAC is disengaged (FAC pushbutton set off) but still valid, the flight envelope function of the
FAC remains active.
If both FACs are valid, FAC1 controls the yaw damper, turn coordination, rudder trim, and rudder
travel limit, and FAC2 is in standby.
FAC1 keeps the aircraft within the flight envelope through FD1 ; FAC2 performs this function through
FD2.
If a failure is detected on any channel of FAC1, FAC2 takes over the corresponding channel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
GENERAL
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FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
YAW FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_40-20 P 1/2
FCOM 19 AUG 10
YAW DAMPING
Applicable to: ALL
Yaw damping stabilizes the aircraft in yaw and coordinates its turns.
In automatic flight (AP engaged) during takeoff and go around, it assists rudder application after an
engine failure (short-term yaw compensation).
Note: When the AP is engaged, the FMGS sends orders to the FAC to give :
‐ yaw damping during approach
‐ yaw control for runway alignment in ROLL OUT mode
RUDDER TRIM
Applicable to: ALL
The rudder trim function :
‐ Executes trim orders, entered by the pilot by using the manual trim knob.
‐ When AP is engaged
▪ executes trim orders from the FMGS.
▪ Assists the system in recovering from engine failure (long-term yaw compensation) in all flight
guidance modes.
▪ If the pilot pushes the rudder more than 10 ° out of trim, it disengages the AP.
Note: When the AP is engaged, the rudder trim knob is inoperative : the master FMGC
sends rudder trim orders to the FAC.
RUDDER TRAVEL LIMITATION
Applicable to:
, ,
MSN,,,,
This function limits rudder deflection is based on speed in order to avoid high structural loads. It is
governed by the following law :
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
YAW FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_40-20 P 2/2
FCOM 19 AUG 10
If both FACs lose the rudder travel limitation function, the value of the rudder deflection limit is locked
at the time of the second failure.
When the slats are extended, the FACs automatically set the rudder deflection limit at the low-speed
　
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