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A - Not available.
B - Available.
C - Available if the FAC pushbuttons are
pressed in.
Pressing the RESET pushbutton enables to return the
rudder to the neutral position:
A - When the AP is not engaged.
B - When the AP is engaged.
C - At any time.
TMUFACE01 LEVEL 3
EFFECTIVITY 22-62-00 Page 6
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 90
ALL
22 - AUTO FLIGHT SYSTEM
22-63-00 YAW DAMPER FUNCTION
CONTENTS:
Components
General
Manual Mode
Manual Alternate
Auto Mode
Land Mode
Power Loop
Monitoring
Self Examination
TMUFACD01 LEVEL 3
EFFECTIVITY 22-63-00 Page 1
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 91
ALL
YAW DAMPER FUNCTION
COMPONENTS
There are two yaw dampers. In normal operation, both
are engaged but only one is active. Yaw damper 1 has
priority.
The yaw damper function is achieved by:
- 2 electrohydraulic actuators with an external
centering element. Each actuator comprises 1 jack, 1
Linear Variable Differential Transducer (LVDT), 2
solenoid valves, 2 selector valves, 1 Pressure Switch
(PS) and 1 Servo Valve (SV).
- 2 Flight Augmentation Computers (FAC 1 and FAC 2).
- 2 Rotary Variable Differential Transducers (RVDT).
GENERAL
Yaw damper 1 and 2 operate with the changeover logics.
The yaw damper actuator does not move the rudder
pedals.
The yaw damper function operates as follows:
- Order is computed by the laws and sent to the
rudder via the related yaw damper actuator.
- Yaw damper actuator 1 is powered by the green
hydraulic system.
- Yaw damper actuator 2 is powered by the yellow
hydraulic system.
MANUAL MODE
In manual mode, the autopilot is not engaged and the
Elevator Aileron Computer sends the turn coordination,
the dutch roll damping and the engine failure
compensation yaw orders to the FAC.
MANUAL ALTERNATE
After a dual Elevator Aileron Computer failure, turn
coordination and engine failure compensation are lost.
Only a simplified alternate law of dutch roll damping
is computed by the FAC.
AUTO MODE
In auto mode, the FAC computes the dutch roll damping
in clean configuration, the engine failure
compensation in take-off, go-around and runway modes.
The turn coordination law is computed by using roll
orders from the FMGC.
LAND MODE
When the LAND mode is engaged, the yaw order is computed
directly by the FMGC.
TMUFACD01-T01 LEVEL 3
EFFECTIVITY 22-63-00 Page 2
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 92
ALL
YAW DAMPER FUNCTION
TMUFACD01-P01 LEVEL 3
EFFECTIVITY 22-63-00 Page 3
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 93
ALL
YAW DAMPER FUNCTION
POWER LOOP
The yaw damper laws control the servovalve, and the
changeover logic enables the jack to be pressurized.
The feedback in the power loop is provided by a Linear
Variable Differential Transducer (LVDT) for the
command side and a Rotary Variable Differential
Transducer (RVDT) for the monitor side.
In case of dual yaw damper loss, a centering spring
rod moves the rudder to the neutral position.
MONITORING
At power up, the yaw damper function safety tests are
initiated.
The continuity between the standby yaw damper and its
servo valve is tested.
The computation is monitored by the comparators between
command and monitor part.
The ELAC, FMGC and ADIRS peripheral inputs are always
monitored.
The power loop is monitored by a comparator between
the yaw order and the rudder position feedback.
In flight, the hydraulic pressures are monitored by
the FAC.
The LVDTs and the RVDTs are always monitored.
TMUFACD01-T01 LEVEL 3
EFFECTIVITY 22-63-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 94
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFACD01 LEVEL 3
EFFECTIVITY 22-63-00 Page 5
Oct 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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