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MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 67
ALL
AFS MAINTENANCE SYSTEM
GROUND SCAN
The GROUND REPORT function displays failures recorded
in the ground area of the FIDS memory.
The PRESENT FAILURE SCAN function is used to isolate
failures present when the function is selected.
The PROGRAM page is used by the manufacturer for
development purposes.
AFS TEST
An AFS TEST is performed:
- to check an AFS Line Replaceable Unit before
removal,
- to check an AFS Line Replaceable Unit after
installation,
- to get trouble-shooting data (even if the test
is OK).
LAND TEST
The LAND TEST enables to test the availability of the
LAND mode and equipment required to obtain CAT 3.
There are several successive pages in which actions,
checks and answers are requested from maintenance.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 68
ALL
AFS MAINTENANCE SYSTEM - GROUND SCAN, AFS TEST & LAND TEST
TMUFACK01-P04 LEVEL 1
EFFECTIVITY 22-00-00 Page 9
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 69
ALL
AFS MAINTENANCE SYSTEM
SAFETY TESTS
After long term power interruption, computers and
control units of the AFS perform safety tests also
called power-up tests.
These tests are only performed on ground, except for
the FCU which can perform safety tests on ground or
in flight.
During these tests, no action should be performed on
the system.
If a unit does not pass the safety test, the unit is
declared failed and is unusable and an ECAM message
is displayed on the STATUS page.
NOTE: The recommended conditions to perform safety
test are:
.aircraft on ground, engines stopped, hydraulic
power (G/Y) for FAC only,
.pull the Circuit Breaker (C/B) of the involved
computer (Both C/Bs for FCU),
.wait 15 seconds (7 minutes for FCU), then push
the C/B of the involved computer,
.wait 1 minute for safety test execution.
PROCEDURE
This AFS maintenance procedure has to be followed in
the event of a pilot report concerning the AFS.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 70
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AFS MAINTENANCE SYSTEM - SAFETY TESTS & PROCEDURE
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 71
ALL
SELF EXAMINATION
When can the safety test of an AFS computer be
performed?
A - In flight or on ground.
B - Only on ground, except for the FCU
safety test which can be performed in
flight or on ground.
C - Only on ground, except for the FMGC
safety test which can be performed only
in flight.
On ground, each AFS computer makes a safety test
after every power cut-off:
A - greater than 1 minute.
B - greater than 1 minute for the FCU and
only 15 seconds for the other computers.
C - greater than 7 minutes for the FCU and
only 15 seconds for the other computers.
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 72
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22 - AUTO FLIGHT SYSTEM
22-63-00 YAW AXIS CONTROL
DESCRIPTION/OPERATION
CONTENTS:
Yaw Damper
Rudder Trim
Rudder Travel Limitation
Self Examination
TMUFACB01 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 73
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YAW AXIS CONTROL DESCRIPTION/OPERATION
YAW DAMPER
When the autopilot is not engaged, the Elevator Aileron
Computer (ELAC) calculates the yaw damper order with
the normal law.
The yaw damper order calculated by the ELAC provides
turn coordination, dutch roll damping and engine
failure compensation.
If both ELACs fail, only the dutch roll damping
(alternate law) is computed by the Flight Augmentation
Computer (FAC) using the ADIRS data.
　
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