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EFFECTIVITY 22-61-00 Page 4
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 84
ALL
22 - AUTO FLIGHT SYSTEM
22-62-00 RUDDER TRIM FUNCTION
CONTENTS:
Components
General
Manual Mode
Automatic Mode
Power Loop
Monitoring
Self Examination
TMUFACE01 LEVEL 3
EFFECTIVITY 22-62-00 Page 1
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 85
ALL
RUDDER TRIM FUNCTION
COMPONENTS
There are two rudder trims. All the components are
duplicated except the RUD TRIM selector and the RESET
pushbutton.
The rudder trim function is achieved by:
- an electromechanical actuator which comprises 2
asynchronous motors connected to a reduction gear by
rigid linkage and 4 Rotary Variable Differential
Transducers (RVDTs).
- a RUD TRIM selector for manual trim control,
- a RESET pushbutton,
- a rudder trim indicator located to the left of the
RUD TRIM selector,
- two Flight Augmentation Computers (FAC 1 and FAC 2).
GENERAL
The rudder trim function has two modes: Manual mode
when the autopilot is not engaged and automatic mode
when the autopilot is engaged.
The autotrim order is computed by the laws, whereas
the manual trim order transits through them. The order
is then sent to the actuator. This order is reproduced
at the rudder pedals.
Priority is given to rudder trim of FAC 1; a changeover
logic enables to switch to FAC 2 in case of failure.
If both rudder trims fail, the last deflection is
maintained.
The rudder trim deflection is displayed on the RUD
TRIM indicator.
NOTE: For the A319, the indication of the maximum
rudder trim deflection is increased from + or -
20° to + or - 25°.
MANUAL MODE
When the autopilot is not engaged, the rudder trim
order is given by the RUD TRIM selector.
NOTE: The RESET pushbutton enables to return the rudder
to the neutral position.
AUTOMATIC MODE
With the autopilot engaged, the Flight Augmentention
Computer calculates the trim order using Flight
Management and Guidance Computer and Air Data Inertial
Reference System data.
NOTE: At touch-down, the AUTO RESET function moves the
rudder to the neutral position
TMUFACE01-T01 LEVEL 3
EFFECTIVITY 22-62-00 Page 2
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 86
ALL
RUDDER TRIM FUNCTION
TMUFACE01-P01 LEVEL 3
EFFECTIVITY 22-62-00 Page 3
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 87
ALL
RUDDER TRIM FUNCTION
POWER LOOP
During the autotest triggered by the FAC power up,
internal actuator monitoring checks the actuator
servo-loop and monitoring circuit validity, and the
enabling signal reception.
Then the changeover logic enables the trim motor to
be supplied and the rudder trim laws control it.
The laws compute the trim order and send it to the
actuator’s motor via the Electronic Control (EC).
The feedback in the power loop is provided by two
Rotary Variable Differential Transducers (RVDTs) for
each side.
MONITORING
The computation and the power loop are monitored by
comparators. The input parameters are also monitored.
The computation is monitored by the comparators between
the FAC command and monitor parts.
The FMGC and ADIRS peripheral inputs are always
monitored.
The amplitude is limited to plus or minus 20°, the
speed is limited to 1°/s in manual control and 5°/s
in automatic control.
The power loop is monitored by the comparators between
the rudder trim order and the position feedback signal.
TMUFACE01-T01 LEVEL 3
EFFECTIVITY 22-62-00 Page 4
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 88
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFACE01 LEVEL 3
EFFECTIVITY 22-62-00 Page 5
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 89
ALL
SELF EXAMINATION
With the autopilot engaged, RUD TRIM selector
orders are:
　
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