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functions and computations.
↑↓(or SLEW) keys Move a page up or down to display portions that are off the screen.
← → keys Move to the next or previous page of a multi-page element. An arrow in
the top right corner indicates that another page is available.
AIRPORT key Calls up the flight plan page that contains the next airport along the
current flight plan. Successive pushes on the key show the alternate
airport, the origin airport (before takeoff), and the next airport again.
Number and letter keys allow the flight crew to insert data in the scratchpad so that they can use‐
a line select key to enter it in the main display.
Three keys have special functions:‐
CLR (clear) key Erases material (messages or inserted data) from the scratchpad or from
certain areas of displayed pages.
OVFY (overfly) key Allows the aircraft to overfly a selected waypoint.
SP (space) key Allows to insert a space in specific messages.
Applicable to: ALL
ANNUNCIATORS (ON THE SIDE OF THE KEYBOARD)
FAIL (amber) Indicates that the Multipurpose Control and Display Unit (MCDU) has
failed.
MCDU MENU (white) Indicates that the flight crew should call up a peripheral linked to the
MCDU (such as ACARS, ATSU or CMS).
FM (white) Comes on while the flight crew is using the MCDU to display peripherals.
This light tells the flight crew that the FMGEC has an important message
to deliver. The flight crew accesses the message by pressing the MCDU
MENU key and the line select key adjacent to the FMGEC prompt.
Applicable to: ,
ANNUNCIATORS (ON THE TOP OF THE KEYBOARD)
FM 1 and FM 2 (amber) : The onside FM is failed
Note: The FM failure annunciator on MCDU 3 comes on only if‐
MCDU 3 operates as a back up of MCDU 1 or 2
A MCDU has never both FM failure annunciators ON.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - MCDU
A330/A340 FLEET DSC-22_10-40-10 P 6/14
FCOM 19 AUG 10
IND (amber) : The onside FM detects an independent mode of operation while both
FM are healthy.
RDY (green) : MCDU has passed its power up test after its BRT knob was turned
to OFF.
Applicable to: ,
ANNUNCIATORS (ON THE TOP OF THE KEYBOARD)
FM 1 and FM 2 (amber) : The onside FM is failed
Note: The FM failure annunciator on MCDU 3 comes on only if‐
MCDU 3 operates as a back up of MCDU 1 or 2
A MCDU has never both FM failure annunciators ON.‐
IND (amber) : The onside FM detects an independent mode of operation while both
FM are healthy.
RDY (green) : MCDU has passed its power up test after it was turned to OFF using
its DIM key.
Applicable to: ,
BRT AND DIM KEYS
The flight crew can adjust the brightness of the MCDU with the BRT and DIM keys.
In addition, the BRT key is used to power up the MCDU, and the DIM key is used to shut down the
MCDU.
Note: In case of MCDU 1 or 2 failure, its DIM key has to be switched off to allow the MCDU 3
connection to the corresponding FMGEC.
Applicable to: ,
BRT knob
Controls the light intensity of the entire MCDU.
Note: In case of MCDU 1 or 2 failure, its BRT knob has to be switched off to allow the MCDU 3
connection to the corresponding FMGEC.
Applicable to: ALL
DATA ENTRY
The flight crew enters data by typing it into the scratchpad on the MCDU. Next, pressing the line
select key (LSK) will load the data from the scratchpad into the desired field. An error message
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
PILOT INTERFACE - MCDU
A330/A340 FLEET DSC-22_10-40-10 P 7/14
FCOM 19 AUG 10
displays if the data are out of range or not formatted correctly. To correct data, the flight crew may
clear the message with the clear (CLR) key and then retype the message into the scratchpad.
Pressing the CLR key when the scratchpad is empty displays “CLR”. To clear data from a field,
select CLR from the scratchpad to the data field to be cleared.
Applicable to: ALL
MCDU ENTRY FORMAT
The flight crew enters information into the MCDU at the bottom line of the scratchpad. When data
has lead zeros, they may be omitted if desired. For example a three-digit wind direction of 060
may be typed as 60. The display will still show 060. To enter an altitude below 1 000 ft, the lead
zero must be added as 0400 for 400 ft. This differentiates the altitude from a flight level.
To enter a double data entry such a speed/altitude, the separating slash must be used. If entering
only the first part of a double entry, omit the slash. To enter only the second part of a double entry,
a leading slash must be used i.e. /0400.
　
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