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When the autopilot is engaged, the FAC calculates the
yaw damper order except in LAND mode where it is
computed by the Flight Management and Guidance Computer
(FMGC).
When the AP is engaged:
- Dutch roll damping law is provided by the FAC
using ADIRS data.
- Engine failure compensation fast law is
provided by the FAC using the ADIRS data in
TO, GA or RWY modes only.
- Turn coordination law computes the yaw order
to the FMGC roll order.
In LAND mode, the FMGC yaw order controls the yaw
damper actuators via the FAC.
RUDDER TRIM
In the manual mode, the rudder trim is controlled by
the RUD TRIM selector via the FAC.
In the rudder trim auto mode, the FAC computes the
engine failure compensation and the turn coordination.
When the AP is engaged:
- The turn coordination law computes the yaw
orders related to the FMGC roll order.
Signals are simultaneously sent to the rudder
trim actuator and the yaw damper actuators.
- The engine failure compensation slow law orders
are sent to the rudder trim actuator.
RUDDER TRAVEL LIMITATION
The rudder travel limitation is computed by the FAC
and sent to the Rudder Travel Limiting unit.
The FAC Rudder Travel Limiting law computes this limit
using the calibrated airspeed (Vc) provided by the
ADIRS.
TMUFACB01-T01 LEVEL 3
EFFECTIVITY 22-63-00 Page 2
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 74
ALL
YAW AXIS CONTROL DESCRIPTION/OPERATION
TMUFACB01-P01 LEVEL 3
EFFECTIVITY 22-63-00 Page 3
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 75
ALL
SELF EXAMINATION
Which computers process the yaw damper order, if
the autopilot is not engaged?
A - Either FMGC or ELAC.
B - Either ELAC or FAC.
C - FMGC and FAC.
With the AP engaged, the engine failure
compensation function using the yaw damper
actuators is available:
A - In cruise.
B - In LAND mode.
C - In TO, GA or RWY modes.
Which actuator(s) are used for turn coordination
with the AP engaged?
A - Rudder trim actuator.
B - Rudder trim and yaw damper actuators.
C - Yaw damper actuators.
TMUFACB01 LEVEL 3
EFFECTIVITY 22-63-00 Page 4
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 76
ALL
22 - AUTO FLIGHT SYSTEM
22-11-00 FAC ENGAGEMENT
CONTENTS:
Normal Configuration
FAC not Energized or not Fitted
Subfunction Fault
Computer Fault
Temporary Power Loss
Self Examination
TMUFACC01 LEVEL 3
EFFECTIVITY 22-11-00 Page 1
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 77
ALL
FAC ENGAGEMENT
NORMAL CONFIGURATION
In normal configuration, when the Flight Augmentation
Computer (FAC) pushbutton is pressed in, the FAULT and
OFF lights are off, provided the internal monitoring
channels are in good condition and the engagement
request is present.
When the FAC pushbutton is released out, the FAC is
disengaged and the white OFF light comes on.
NOTE: The FAC cannot be engaged on ground after power
up during the 30 second test.
The amber FAULT light flashes.
FAC NOT ENERGIZED OR NOT FITTED
If the FAC is not energized and the pushbutton is
pressed in, the FAULT light is on with an amber message
on the ECAM.
SUBFUNCTION FAULT
If one or several yaw axis control functions fail,
only the amber message appears on the ECAM. The FAULT
light remains OFF.
If one or more of the following functions fail:
- yaw damper,
- rudder trim,
- rudder travel limitation,
only the amber message appears on the ECAM display
unit.
The FAC remains engaged.
COMPUTER FAULT
When the computer itself fails, the FAC is disengaged
and the FAULT light comes on with a message on the
ECAM.
In this case, a FAC reset must be attempted following
the ECAM procedure.
NOTE: On ground with engines shut down, the reset is
automatic when the fault disappears.
TEMPORARY POWER LOSS
If a temporary power loss occurs, the FAULT light comes
on with a message on the ECAM.
In flight reset is only possible using the FAC
pushbutton.
TMUFACC01-T01 LEVEL 3
EFFECTIVITY 22-11-00 Page 2
　
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