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UF94200
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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22 - AUTO FLIGHT SYSTEM
22-80-00 FCU INTERFACES
CONTENTS:
General
Discrete Inputs
Discrete Outputs
ARINC Inputs
ARINC Outputs
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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FCU INTERFACES
GENERAL
The Flight Control Unit (FCU) interfaces consist of
discretes and ARINC 429 digital buses. There are no
analog interfaces.
DISCRETE INPUTS
The Flight Management and Guidance Computers (FMGCs)
send the autopilot (AP), Flight Director (FD) and
autothrust (A/THR) engagement discretes to authorize
the lighting of the associated pushbuttons on the FCU
front panel.
They also send the FCU FAIL discretes which are the
result of the comparison between the FMGC N1 target
sent to the FCU and the FCU N1 target sent to the
Electronic Control Units (ECUs).
The annunciator light test relay sends a discrete
signal to test the FCU lamps.
DISCRETE OUTPUTS
The FCU delivers control data for AP1, AP2 and A/THR
engagement to each FMGC. This data is directly issued
from the engagement pushbuttons.
Each FCU processor sends its own FCU HLTY (healthy)
signal to the FMGCs.
TMUFGCX02-T01 LEVEL 3
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FCU INTERFACES - DISCRETE INPUTS/OUTPUTS
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FCU INTERFACES
ARINC INPUTS
For synchronization and internal monitoring purposes,
FCU output buses are looped back to the FCU on the
respective opposite channels.
In order to avoid display modifications during
reconfigurations, the non active channel of a given
function, synchronizes on the values computed by the
active channel.
Each FCU channel receives data, from its own FMGC on
an ARINC bus, such as modes, functions, engagement
status, thrust target for selection...
ARINC OUTPUTS
The FCU sends outputs on 4 ARINC bus. They are 1A, 1B,
2A, 2B.
Certain data transmitted by the FMGCs are fed back to
the FMGCs through the FCU buses for comparison with
the source data.
These buses also send data to :
- the Engine Interface Units (EIUs) to provide
thrust target to the Electronic Control Units,
- the Air Data Inertial Reference Units (ADIRUs)
and Weather Radar (WR) such as display
information, range and mode, reference
parameter selection...,
- the Display Management Computers (DMCs) for
display such as baro setting, selected
altitude...,
- the Flight Warning Computers (FWCs) for
warnings such as selected altitude for
altitude alert...
TMUFGCX02-T02 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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FCU INTERFACES - ARINC INPUTS/OUTPUTS
TMUFGCX02-P02 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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22 - AUTOFLIGHT
22-80-00 MCDU INTERFACES
CONTENTS:
General
Discrete Inputs
Discrete Output
ARINC Inputs
ARINC Outputs
TMUFGCY01 LEVEL 3
EFFECTIVITY 22-80-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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MCDU INTERFACES
GENERAL
The Multipurpose Control and Display Unit (MCDU)
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