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- status and memos.
Each FWC sends a copy of its own acquisition through
an ARINC 429 bus to the opposite FWC.
The FWC outputs are:
- discrete for visual attention getters,
- analog for audio signals,
- ARINC 429 called FWC DATA BUS,
- RS 422 called FWC MESSAGE BUS.
The FWC operational software is divided into two main
parts, each part corresponding to an OBRM.
Each FWC includes Built In Test Equipment (BITE) to
detect the failures.
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EIS: ECAM DESCRIPTION/OPERATION - FWC
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DMC
The three Display Management Computers (DMCs) are
identical and interchangeable.
They receive data from the aircraft systems, either
directly for some of them or through the SDACs and
FWCs.
They decode and process the data in order to display
messages or indications on the ECAM display units.
The DMCs are divided into four parts:
- data acquisition,
- PFD processing channel,
- ND processing channel,
- ECAM processing channel,
and they can simultaneously drive three DUs (two EFIS
and one ECAM).
The Engine Warning Display (EWD) and System Display
(SD) receive digital signals from their related DMC
through a Master Dedicated Serial Data Link (DSDL).
In feedback, the display units send to their driving
DMC, through a FEEDBACK DSDL:
- acknowledgment signals,
- DU failure information,
- critical parameter feedback signals (example:
engine primary parameters from Engine and
Warning Display).
The DMCs are provided with three On Board Replaceable
Modules (OBRMs): one for PFD, one for ND and one for
ECAM, for software modifications.
They are also provided with Built In Test Equipment
(BITE) for maintenance operation.
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EIS: ECAM DESCRIPTION/OPERATION - DMC
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EIS: ECAM DESCRIPTION/OPERATION
INTERFACE
The ECAM interface includes:
- the ECAM Control Panel (ECP),
- the warning and caution lights,
- the loudspeakers,
- the display units.
The ECAM Control Panel is a control and display unit.
It transmits the pilot selections to the FWCs and DMCs.
It receives the DMC data in order to illuminate its
keys lights.
The ECAM Control Panel outputs discretes for the Clear
(CLR), Recall (RCL), Status (STS) and EMERgency CANCEL
keys wired to the FWCs, and for the ALL key wired to
the DMCs.
It is also linked to the display units for the
brightness control.
Both Master warning and Master caution lights are
controlled by each FWC.
The aural warnings and synthetic voices are delivered
by the FWCs to the cockpit loudspeakers.
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EIS: ECAM DESCRIPTION/OPERATION - INTERFACE
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SELF EXAMINATION
Which computer generates the audio signals?
A - DMC.
B - SDAC.
C - FWC.
What kind of connection is used to transmit the
signals to be displayed on the display units?
A - Feedback.
B - Master DSDL.
C - Message Data bus.
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