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TMUFGCA01-P01 LEVEL 1
EFFECTIVITY 22-00-00 Page 3
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 7
ALL
SELF EXAMINATION
What are the basic functions of the FACs?
A - Management functions and flight envelope
protection.
B - Rudder control and flight envelope
protection.
C - Guidance functions and rudder control.
Where are the FMGC functions controlled from?
A - The MCDUs and rudder trim control panel.
B - The FCU and rudder trim control panel.
C - The FCU and MCDUs.
TMUFGCA01 LEVEL 1
EFFECTIVITY 22-00-00 Page 4
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 8
ALL
22 - AUTO FLIGHT SYSTEM
22-60-00 FAC GENERAL
CONTENTS:
Functions
Yaw Damper
Rudder Trim
Rudder Travel Limitation
Flight Envelope Protection
Controls
Displays
Self Examination
TMUFACA02 LEVEL 1
EFFECTIVITY 22-60-00 Page 1
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 9
ALL
FAC GENERAL
FUNCTIONS
The basic functions of the Flight Augmentation Computer
(FAC) are:
- yaw damper,
- rudder trim,
- rudder travel limitation,
- flight envelope protection.
YAW DAMPER
The yaw damper has four functions and controls the
rudder via yaw damper actuators.
Upon Flight Management and Guidance Computer (FMGC),
Elevator Aileron Computer (ELAC) or FAC orders,
the yaw damper provides:
- dutch roll damping,
- turn coordination,
- engine failure compensation,
- yaw guidance order execution.
RUDDER TRIM
The rudder trim orders come from the rudder trim
selector, or from the FMGC to control the rudder via
the rudder trim actuator.
The rudder trim provides:
- manual trim with RUD TRIM selector,
- auto trim when the autopilot is engaged.
RUDDER TRAVEL LIMITATION
The Rudder Travel Limiting unit limits the deflection
of the rudder according to the aircraft speed.
The Rudder Travel Limiting function:
- limits the deflection for structure integrity,
- prevents excessive deflections which would
penalize the aircraft performance.
Aircraft speed information is provided by the Air Data
Inertial Reference Units (ADIRUs).
FLIGHT ENVELOPE PROTECTION
For flight envelope protection, the FAC computes the
various characteristic speeds for aircraft operation,
the low energy warning, the excessive angle of attack
and windshear detections.
The characteristic speeds computed using the ADIRU,
Landing Gear Control and Interface Unit (LGCIU), FMGC
and Slat Flap Control Computer (SFCC) data, are
displayed on the PFDs.
The alpha floor (excessive angle of attack) and
windshear detections are sent to the FMGCs.
The low energy warning computation is sent to the
Flight Warning Computer (FWC) which generates an aural
warning: "SPEED, SPEED, SPEED".
TMUFACA02-T01 LEVEL 1
EFFECTIVITY 22-60-00 Page 2
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 10
ALL
FAC GENERAL
TMUFACA02-P01 LEVEL 1
EFFECTIVITY 22-60-00 Page 3
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 11
ALL
FAC GENERAL
CONTROLS
Each FAC receives inputs from its related pushbutton,
the RUD TRIM selector and the RUD TRIM RESET
pushbutton.
The RUD TRIM selector deflects the rudder.
The RESET pushbutton returns the rudder to the neutral
position.
DISPLAYS
Some of the data computed by the FAC is displayed.
- The characteristic speeds computed by the FACs
are shown on the speed scale of the Primary
Flight Display (PFD).
- The rudder trim position is displayed on the
ECAM System Display and on the RUD TRIM control
panel.
- The red WINDSHEAR indication is displayed in
the center of both PFDs.
NOTE: The Rudder Travel Limiting position is not
displayed. Only its maximum stop positions are
shown on the ECAM.
TMUFACA02-T01 LEVEL 1
EFFECTIVITY 22-60-00 Page 4
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
　
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