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BYPASS MODE (Both SV De-energized)
The two solenoid valves are de-energized and the
associated selector valves are set to the bypass mode
under the action of their spring. The two piston
chambers are, in this case, interconnected.
The pressure switch is not activated.
TMUFCLN01-T02 LEVEL 3
EFFECTIVITY 27-26-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 164
ALL
YAW DAMPER SERVO ACTUATOR OPERATION - BYPASS MODE (Both SV De-energized)
TMUFCLN01-P02 LEVEL 3
EFFECTIVITY 27-26-00 Page 5
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 165
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YAW DAMPER SERVO ACTUATOR OPERATION
BYPASS MODE (One SV De-energized only)
In case of a single electrical failure causing one
selector valve to be in bypass mode, the other being
in active mode, the result lies in the interconnection
of the two actuator chambers, thus the actuator is in
bypass mode.
In this way, thanks to the pressure switch, which is
now connected to the supply pressure, this abnormal
configuration is indicated to the FACs.
TMUFCLN01-T03 LEVEL 3
EFFECTIVITY 27-26-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 166
ALL
YAW DAMPER SERVO ACTUATOR OPERATION - BYPASS MODE (One SV De-energized only)
TMUFCLN01-P03 LEVEL 3
EFFECTIVITY 27-26-00 Page 7
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 167
ALL
YAW DAMPER SERVO ACTUATOR OPERATION
BYPASS MODE (Hydraulic Failure)
With no hydraulic pressure, the two selector valves
are set, under the action of their spring, in bypass
mode, thus the two chambers of the piston are
interconnected.
In this case, the pressure switch is not activated.
TMUFCLN01-T04 LEVEL 3
EFFECTIVITY 27-26-00 Page 8
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 168
ALL
YAW DAMPER SERVO ACTUATOR OPERATION - BYPASS MODE (Hydraulic Failure)
TMUFCLN01-P04 LEVEL 3
EFFECTIVITY 27-26-00 Page 9
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 169
ALL
SELF EXAMINATION
Which EFCS computers control and monitor the yaw
damper servo actuators ?
A - ELACs and SECs.
B - ELACs and SECs and FACs.
C - FACs.
In which position is the actuator when both
solenoids are de-energized ?
A - Re-centering mode.
B - Active mode.
C - Bypass mode.
TMUFCLN01 LEVEL 3
EFFECTIVITY 27-26-00 Page 10
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 170
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27 - FLIGHT CONTROLS
27-20-00 RUDDER CHANNEL COMPONENTS (FWD)
CONTENTS:
Rack Assembly
Rudder Pedal Position Transmitter
Cable Tension Regulator
Rudder Trim Control Switch
TMUFCLW01 LEVEL 3
EFFECTIVITY 27-20-00 Page 1
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 171
ALL
RUDDER CHANNEL COMPONENTS (FWD)
RACK ASSEMBLY
IDENTIFICATION
FIN:
LOCATION
ZONE:
COMPONENT DESCRIPTION
Two interconnected pairs of pedals drive the rudder,
firstly, through a mechanical linkage located under
the cockpit floor.
A lever-controlled rack assembly is used to adjust the
position of the pedals.
Then, levers attached to each pedal provide braking
inputs when the pedals turn about their axes.
TMUFCLW01-T01 LEVEL 3
EFFECTIVITY 27-20-00 Page 2
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 172
ALL
RUDDER CHANNEL COMPONENTS (FWD) - RACK ASSEMBLY
TMUFCLW01-P01 LEVEL 3
EFFECTIVITY 27-20-00 Page 3
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 173
ALL
RUDDER CHANNEL COMPONENTS (FWD)
RUDDER PEDAL POSITION TRANSMITTER
　
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