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Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 78
ALL
FAC ENGAGEMENT
TMUFACC01-P01 LEVEL 3
EFFECTIVITY 22-11-00 Page 3
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 79
ALL
SELF EXAMINATION
How is the FAC engaged?
A - By pressing in the FAC pushbutton.
B - When FAC internal monitoring (including
power up test time) is healthy and
engagement condition is requested.
C - A and B.
When does the FAC 1 (2) pushbutton white OFF light
come on?
A - In case of FAC 1 (2) failure.
B - When FAC 1 (2) pushbutton is pressed in
and FAC 1 (2) is not energized.
C - When the FAC 1 (2) pushbutton is
released out.
TMUFACC01 LEVEL 3
EFFECTIVITY 22-11-00 Page 4
Aug 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 80
ALL
22 - AUTO FLIGHT SYSTEM
22-61-00 RUDDER TRAVEL LIMITING FUNCTION
CONTENTS:
Components
General
Laws
Power Loop
Monitoring
Self Examination
TMUFACF01 LEVEL 3
EFFECTIVITY 22-61-00 Page 1
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 81
ALL
RUDDER TRAVEL LIMITING FUNCTION
COMPONENTS
The Rudder Travel Limiting (RTL) function is dual.
All the components are duplicated.
The RTL function is achieved by:
- an electromechanical RTL unit with two motors,
- two Rotary Variable Differential Transducers (RVDTs)
integrated in the unit,
- two Flight Augmentation Computers (FAC 1 and FAC 2).
GENERAL
The Rudder Travel Limiting function acts through a
control law, which is a function of the corrected
airspeed, and returns to the low speed limitation in
case of failure.
Normal operation:
The RTL law in the command channel of FAC 1 (active
side) controls the RTL unit stops through a motor.
Return to low speed:
If both RTL functions fail, when the slats are
extended, the full rudder deflection is obtained.
Priority is given to RTL of FAC 1; a changeover logic
enables to switch to FAC 2 in case of failure.
LAWS
The Rudder Travel Limiting control law generates a
rudder deflection order in relation to the corrected
airspeed.
NOTE: For the A319, the maximum rudder deflection is
increased from 25° to 30°.
POWER LOOP
The Rudder Travel Limiting law controls the unit’s
motor, and the changeover logic enables the motor to
be supplied.
The return to low speed function has an independent
power supply.
The law computes the RTL order and sends it to its
motor via an electronic control.
The feedback in the power loop is provided by one
Rotary Variable Differential Transducer (RVDT) for
slaving and monitoring.
The return to low speed logic connects the motor
directly to 26VAC in order to recover full rudder
deflection.
MONITORING
The computation and the power loop are monitored by
comparators.
The computation is monitored by the comparator between
the FAC command and monitor channels.
The ADIRS parameters (Vc) are monitored by a two-by-two
comparison and then one of them is selected.
The power loop is monitored by the comparators between
the Rudder Travel Limiting order and the RTL unit
position feedback.
TMUFACF01-T01 LEVEL 3
EFFECTIVITY 22-61-00 Page 2
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 82
ALL
RUDDER TRAVEL LIMITING FUNCTION
TMUFACF01-P01 LEVEL 3
EFFECTIVITY 22-61-00 Page 3
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 83
ALL
SELF EXAMINATION
In case of a double RTL failure, the return to low
speed logic:
A - moves the stops to restore the maximum
rudder deflection upon slat extension.
B - maintains the last position.
C - moves the stops to the maximum rudder
deflection at any time.
Which parameters are used for RTL?
A - Vc parameters from the ADIRS.
B - The slats extended signal from the SFCC.
C - Vc parameters and slats position.
TMUFACF01 LEVEL 3
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