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the FWC in order to constitute the maintenance status.
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CFDS: CFDIU FUNCTIONS
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CFDS: CFDIU FUNCTIONS
INTERFACES (cont’d)
FWC (ECAM)
The CFDIU receives the flight phases and ECAM warnings
from the Flight Warning Computer.
The ECAM warnings are used by the CFDIU to generate
the LAST or CURRENT LEG ECAM REPORT.
Only PRIMARY failures, INDEPENDENT failures and CLASS
2 failure messages (Maintenance status) are received.
DMU (AIDS)
The CFDIU is used as an interface between the Data
Management Unit and the Flight Warning Computer to
send some DMU class 2 failures.
DMU class 2 failures are used for the maintenance
status on the ECAM.
DMC (EIS)
The CFDIU receives the Engine Serial Number from the
Display Management Computer (DMC) and sends this
parameter to the Engine Vibration Monitoring Unit
(EVMU).
ATSU
The ATSU receives the city pair from the Flight
Augmentation Computer through the CFDIU.
The CFDIU can send real time failures and ECAM warning
messages to the Management Unit. It can also send the
PFR (Print Flight Report) to the ATSU at the end of
the flight.
EVMU (Engine Vibration Monitoring Unit)
The EVMU receives the Engine serial number from the
Display Management Computer through the CFDIU.
The Display Management Computer receives it from the
Engine Control Unit (ECU) for CFM engines or Electronic
Engine Control (EEC) for IAE engines.
ABNORMAL OPERATION
CLOCK BACKUP
If the aircraft clock fails, the CFDIU takes over and
its internal clock sends GMT and DATE on the output
bus to all type 1 systems.
Upon power-on after A/C clock failure ,the
item"GMT/DATE init is added to the CFDS menu.This
option enables GMT and date initialization.
BACKUP MODE
In BACKUP MODE, only the main computers are available
and only the "SYSTEM REPORT/TEST" function is
available.
In the event of main channel failure :
- If this failure is serious (Power Supply or
Microprocessor) the standby channel takes over.Only
"BACKUP MODE" is displayed on the CFDS menu.
No function is available in flight.
- If this failure is minor, the item "BACKUP MODE" is
added to the CFDS menu. This enables access to the
standby channel. The normal channel remains available.
CFDIU FAILURE
When the CFDIU is affected by an internal failure, the
message "CFDIU" is displayed on the ECAM MAINTENANCE
STATUS page.
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31 - INDICATING/RECORDING SYSTEMS
31-32-00 CFDS: CENTRALIZED FAULT DISPLAY
SYSTEM COMPONENTS
CONTENTS:
Centralized Fault Display Interface Unit (CFDIU)
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CFDS: CENTRALIZED FAULT DISPLAY SYSTEM COMPONENTS
CENTRALIZED FAULT DISPLAY INTERFACE UNIT (CFDIU)
IDENTIFICATION
FIN: 1TW
LOCATION
ZONE: 127
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CFDS: CENTRALIZED FAULT DISPLAY SYSTEM COMPONENTS -
CENTRALIZED FAULT DISPLAY INTERFACE UNIT (CFDIU)
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