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UF94200
EFFECTIVITY Page 161
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MCDU DESCRIPTION
DISPLAY KEYS
The six display keys comprise a NEXT PAGE key, two
slew keys, an AIRPORT key, a clear (CLR) key and an
overfly (OVFY) key.
NEXT PAGE KEY
The NEXT PAGE key is used to display one by one all
the successive pages of the last selected page key.
After the last page, the first one is presented again.
NOTE: When two pages correspond to a page key, an arrow
is displayed in the top right-hand corner of the
sreen.
When there are more than two pages, the page
rank is displayed.
SLEW KEYS
Some pages are too long to be displayed entirely on
the screen. These pages are identified with a symbol
in the bottom right corner and can be scrolled up or
down by pressing the related slew key.
Another use of the slew keys is to increment or
decrement certain values shown on the screen. These
values are identified by adjacent arrows.
AIRPORT KEY
Pressing the AIRPORT key allows flight plan pages to
be shifted to the page containing the next airport
along the flight plan.
CLR KEY
The clear (CLR) key is used to clear data or messages
displayed on the scratchpad and also to clear various
parameters displayed on the screen.
OVFY KEY
Pressing the overfly (OVFY) key allows overflight of
the selected waypoint.
TMUFM2403-T02 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
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MCDU DESCRIPTION - DISPLAY KEYS
TMUFM2403-P02 LEVEL 3
EFFECTIVITY 22-82-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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MCDU DESCRIPTION
LINE SELECT KEYS
Line Select Keys (LSKs) are used to:
- Insert, activate, modify or delete data in the
adjacent line.
- Select another page or make an action displayed
in the adjacent data field.
Actions are identified by symbols, such as:
< (white) : New page called by pressing the adjacent
LSK.
* (amber): FMGS function activation.
[ ] (cyan) : May be inserted in this line.
¬       (cyan) : To activate or select data.
ANNUNCIATORS
There are three annunciators located on the lower part
of the MCDU.
MCDU MENU
The display shows that the MCDU is linked to the Flight
Management and Guidance Computer (FMGC), Air Traffic
Service Unit (ATSU), Aircraft Integrated Data System
(AIDS) and Centralized Fault Display System (CFDS).
The MCDU MENU annunciator comes on white if a system
linked to the MCDU, requests the display.
In this example, the FMGC is the active system
(indicated by the green color and the absence of the
prompt) on the MCDU but the CFDS requests the display.
NOTE: At power up, the MCDU communicates in priority
with the FMGCs.
FMGC
The FMGC annuciator comes on white to alert the crew
that the FMGC has an important message to display while
the MCDU is linked to another system.
In this case, any key can be pressed to return to the
Flight Management related display.
FAIL
The FAIL annuciator comes on amber in case of a MCDU
failure.
TMUFM2403-T03 LEVEL 3
EFFECTIVITY 22-82-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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EFFECTIVITY Page 164
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MCDU DESCRIPTION - LINE SELECT KEYS / ANNUNCIATORS
TMUFM2403-P03 LEVEL 3
EFFECTIVITY 22-82-00 Page 7
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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MCDU DESCRIPTION
DISPLAY LAYOUT
The MCDU display layout includes the title line, and
the scratchpad where pilot entries are first made.
FMGC messages are also displayed on the scratchpad.
The 6 data field lines, displayed in large font,
display either data from FMGC or data entered by the
pilots.
6 label lines, displayed in small font, contain the
title of the data field just below.
DATA ENTRY
To enter any data into the FMGC, the pilot must first
write the data onto the scratchpad using the
alphanumeric keyboard.
The data are then inserted into the suitable data field
by pressing the corresponding Line Select Key, in this
example the Line Select Key adjacent to the CO RTE
field.
When the Line Select Key is pressed, the FMGC checks
　
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