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which converts the electrical input from the FACs
(Flight Augmentation Computer) into a rotation of its
output shaft.
The rudder trim actuator can be controlled either by
the rudder trim control switch located in the center
pedestal of the cockpit, in manual mode, or by the
FMGCs (Flight Management & Guidance Computer) in A/P
mode.
In both cases orders are sent via the FACs.
DESCRIPTION/OPERATION
The rudder trim actuator has 2 DC motors, installed
on the same shaft. Each one is controlled by an
independent electronic module. With only one motor
operating at a time (via FAC1 or 2).
The motors, permanently coupled to a reduction gear,
drive the output shaft, via a torque limiter. Then the
output shaft drives 4 RVDTs, transmitting the output
shaft position signal to the FACs.
TMUFCAK01-T01 LEVEL 3
EFFECTIVITY 27-22-00 Page 2
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 144
ALL
RUDDER TRIM ACTUATOR (D/O)
TMUFCAK01-P01 LEVEL 3
EFFECTIVITY 27-22-00 Page 3
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 145
ALL
SELF EXAMINATION
Which computers control the rudder trim actuator in
manual mode?
A - The FMGCs only.
B - The FACs only.
C - The FMGCs and the FACs.
TMUFCAK01 LEVEL 3
EFFECTIVITY 27-22-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 146
ALL
27 - FLIGHT CONTROLS
27-20-00 RUDDER SERVO CONTROL OPERATION
CONTENTS:
Active Mode
Damping Mode
Jammed Control Valve
Self Examination
TMUFCLL01 LEVEL 3
EFFECTIVITY 27-20-00 Page 1
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 147
ALL
RUDDER SERVO CONTROL OPERATION
ACTIVE MODE
When the rudder servo control actuator is in active
mode, the actuator moves to the right or to the left
according to the control valve position.
TMUFCLL01-T01 LEVEL 3
EFFECTIVITY 27-20-00 Page 2
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 148
ALL
RUDDER SERVO CONTROL OPERATION - ACTIVE MODE
TMUFCLL01-P01 LEVEL 3
EFFECTIVITY 27-20-00 Page 3
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 149
ALL
DAMPING MODE
The rudder servo control actuator changes to damping
mode, as soon as the hydraulic pressure supply is cut.
TMUFCLL01-T02 LEVEL 3
EFFECTIVITY 27-20-00 Page 4
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 150
ALL
RUDDER SERVO CONTROL OPERATION - DAMPING MODE
TMUFCLL01-P02 LEVEL 3
EFFECTIVITY 27-20-00 Page 5
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 151
ALL
JAMMED CONTROL VALVE
If the control valve jams, the rudder servo control
actuator follows the rudder surface movement, ensured
by the other rudder servo controls.
TMUFCLL01-T03 LEVEL 3
EFFECTIVITY 27-20-00 Page 6
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 152
ALL
RUDDER SERVO CONTROL OPERATION - JAMMED CONTROL MODE
TMUFCLL01-P03 LEVEL 3
EFFECTIVITY 27-20-00 Page 7
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 153
ALL
SELF EXAMINATION
Which modes exist for a rudder servo control
actuator ?
A - A re-centering and active mode.
B - A re-centering and damping mode.
C - An active and damping mode.
What causes the rudder servo actuator to go to
damping mode ?
A - When hydraulic pressure is lost.
B - When ELAC 1 signal is lost.
C - When Fac 2 and 3 signals are lost.
TMUFCLL01 LEVEL 3
EFFECTIVITY 27-20-00 Page 8
Oct 31/97
_A319/A320/A321 TECHNICAL TRAINING MANUAL
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