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the rudder hydraulic actuators through a mechanical
differential unit: each servo actuator is controlled
by its associated FAC.
No feedback to the rudder pedals is provided thanks
to the differential unit.
TMUFCT802-T02 LEVEL 3
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SELF EXAMINATION
How many hydraulic systems power the rudder ?
A - One.
B - Two.
C - Three.
Which signals cause rudder pedal movements ?
A - Yaw damping signals.
B - Rudder trim signals.
C - Turn coordination signals.
TMUFCT802 LEVEL 3
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TMUFCT802 LEVEL 3
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27 - FLIGHT CONTROLS
27-00-00 YAW CONTROL ABNORMAL D/O
CONTENTS:
Alternate Law
Yaw Mechanical
TMUFCT902 LEVEL 3
EFFECTIVITY 27-00-00 Page 1
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YAW CONTROL ABNORMAL D/O
ALTERNATE LAW
The alternate yaw damper law computed in the Flight
Augmentation Computer becomes active if the roll normal
law fails. Turn coordination is no longer available.
The alternate yaw damper law also becomes active in
case:
- 2 ADRs or 2 IRs or 2 ELACs or both ailerons or
all spoilers fail or B+G hydraulic low pressure
or loss of pitch normal law.
- The alternate law in FAC 1 is active with the
emergency electrical supply (Emergency
generator running).
- The yaw damper authority is limited to +/- 5o
rudder deflection.
YAW MECHANICAL
The mechanical rudder control, which is available at
all times, must be used following the failures shown
below:
- 2 FACs or 3 ADRs or 3 IRs or G+Y hydraulic low
pressure or electrical power on batteries only.
NOTE: In case of a dual FAC failure, a specific channel
in each FAC selects the rudder limit low speed
configuration when the slats are extended.
TMUFCT902-T01 LEVEL 3
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YAW CONTROL ABNORMAL D/O
TMUFCT902-P01 LEVEL 3
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27 - FLIGHT CONTROLS
27-14-00 AILERON SERVO CONTROL OPERATION
CONTENTS:
Active Mode
Damping Mode
Self Examination
TMUFCLI01 LEVEL 3
EFFECTIVITY 27-14-00 Page 1
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AILERON SERVO CONTROL OPERATION
ACTIVE MODE
In the active mode, the aileron servo-control actuator
is pressurized and the solenoid valve energized by the
computer.
TMUFCLI01-T01 LEVEL 3
EFFECTIVITY 27-14-00 Page 2
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AILERON SERVO CONTROL OPERATION - ACTIVE MODE
TMUFCLI01-P01 LEVEL 3
EFFECTIVITY 27-14-00 Page 3
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AILERON SERVO CONTROL OPERATION
DAMPING MODE
If the solenoid valve is de-energized or the
servo-control actuator is not pressurized, the servo
control actuator is in damping mode.
In damping mode, the actuator follows the control
surface movements.
TMUFCLI01-T02 LEVEL 3
EFFECTIVITY 27-14-00 Page 4
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