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The other systems are displayed in white.
3.) A multiple page display is indicated by an arrow
in the right upper corner of the screen. In this
case the NEXT PAGE key must be used to give access to
the various pages of the display.
The NEXT PAGE key can be used as long as the arrow is
displayed.
4.) Some displays contain too much data for a single
page.
In these instances, vertical scroll keys can be used
to scroll display, up or down.
The scroll keys can be used as long as these arrows
are displayed.
5.) Twelve line select keys, six on the left and six
on the right, give access to a page or a function.
The line select keys permit access to a page or a
function when these symbols appear (>,<,*).
They are identified as 1L to 6L on the left, and 1R
to 6R on the right.
6.) The MCDU MENU annunciator comes on white when a
system connected to the MCDU requests to be displayed.
7.) The CRT contains 14 lines, each having 24
characters.
The top line is used as title line and the bottom one,
is the scratchpad.
Two character size can be used, as well as various
colours: white, cyan, green, amber.
Various symbols < - > * ® ­ ¯  can be displayed to
indicate special functions.
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31 - INDICATING/RECORDING SYSTEMS
31-32-00 CFDS: AIRCRAFT SYSTEM TYPES
CONTENTS:
Type 1 Systems
Type 2 System
Type 3 System
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CFDS: AIRCRAFT SYSTEM TYPES
TYPE 1 SYSTEMS
Most systems are type 1 systems. These systems can
memorize failures occured in the last 64 flight legs.
Type 1 systems are connected to the Centralized Fault
Display Interface Unit (CFDIU) via an ARINC 429 input
bus and an ARINC 429 output bus.
SINGLE COMPUTER
The first configuration in TYPE 1 is a single computer.
Example: VHF 1 Transceiver.
MULTI COMPUTER
The second configuration in TYPE 1 includes several
computers in the same aircraft system. One computer
concentrates the maintenance data of the other
computers.
Example: Flight Management and Guidance Computers
(FMGC) and Flight Augmentation Computer (FAC) with
FMGC 1 as A
FMGC 2 as B
FAC 1 as C
DUPLICATED SYSTEM
A duplicated system includes two different subsystems
in the same computer.
Example: Air Data Inertial Reference Unit (ADIRU)
with ADR as subsystem 1
IR as subsystem 2.
TYPE 2 SYSTEM
Type 2 systems memorize only failures from the last
flight leg. The discrete signal is provided to initiate
the test of the system.
Example: Avionic Electronic Ventilation Computer
(AEVC)
TYPE 3 SYSTEM
TYPE 3 systems are simple systems linked to the CFDS
by only two discrete signals.
Type 3 systems cannot memorize failure messages.
The discrete input permits to initiate the test or
reset.
The discrete output indicates if the system is OK or
not.
Example: Transformer Rectifier Unit (TRU)
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