MCDU

MCDU Panel

Difficulty

Picture story

Base of the MCDU is the NOVA MCDU Kit from FDS in Canada. I glued all the buttons on a plexi panel.  
Then I took white translucent foil and glued it behind the top layer of the knobs. 
This is the 5,6" TFT screen with the control panel for brightness, contrast and ... 
I took flat cable to connect 8 buttons to 1 line of the matrix of the FSBUS IO board. 
Here you see the assembly. From left to right: The plexi panel with the knobs. LCD screen. Control panel for the LCD screen. FSBUS IO card. 
From the above side. 
The cabling. Actual not connected. 
The view to LCD, Control panel and FSBUS panel. 
The knobs are glued and painted. 
   

Functions

A320 Multifunction Control Display Unit (MCDU)



Line Select Keys



Identified as 1L - 6L and 1R - 6R, provide access to the on-side data for the left and right data fields. The keys transfer data from the scratch pad to the line next to key if acceptable to FMGC. If a caret ( < or > ) appears next to the key, selecting the key accesses another MCDU page.


Fail / FMGC Annunciator

The Fail Annunciator illuminates when the MCDU has stopped operating properly. The display screen blanks, and "FMC FAIL" appears.
The FMGC Annunciator illuminates when the FMGC is not linked to the MCDU and the FMGC requests the display. Return to the FMGC via the MCDU MENU key.

MCDU Menu Annunciator

Illuminates when a system linked to the MCDU requests the display. The system can be changed with the MCDU MENU key.



MCDU Page Formats and Colors

Page Formats

Large Font Entry
Represents pilot entries or modifiable data.

Small Font Entry
Represents predicted, defaulted, or FMGC-calculated values.

Line Label
Identifies the data displayed directly under this label line (in small font).

Data Line
Contains box prompts, dashes, brackets and computer-generated data (displayed in small font), or pilot-entered data (displayed in large font).

Box Prompts ()
Indicates that data entry is required for minimum FMGS operation. The data is entered via the scratch pad and replaces the box prompts when the associated line select key is pressed. The box prompt entry appears in large font.

Dashes ( - - - - )
Indicates that data entry is not usually required or that data is being calculated by the FMGC. The calculated data will appear in small font.

Brackets ( [ ] )
Indicates that data entry is optional.

Vertical Slew Prompts ()
Indicates that the latitude/longitude value below the prompts can be increased or decreased. The slew prompts also appear in the last two spaces of the scratch [ad to indicate that the display can be scrolled up or down.

Asterisk ( * )
Indicates that pushing the applicable line select key will change the parameters which affect the airplanes active situation.

Page Prompts ( < or > )
Indicates that another MCDU page is accessible when the associated line select key is pressed.

Overfly Triangle ()
Appears next to a qaypoint identifier on the F-PLN page to indicate that the airplane must overfly the waypoint.

MC
BLUE
informs the crew that data entry is allowed. Pilot-entered data is shown in large font and FMS-generated data is shown in small font. Blue information includes modifiable/selectable data, entry brackets (no default data exists), missed approach waypoints and active alternate flight plan data.

MAGENTA
identifies constraints. Magenta information includes VNAV altitude/speed/time constraints that will be met, altitude/speed/time constraint values and climb and descent speed limits.

GREEN
is used for FMS-generated data that is not modifiable such as active flight plan data (except "TO" waypoint and destination data)

AMBER
signifies that the item being displayed is important and requires immediate attention. Amber information includes VNAV altitude/speed/time constraints that will be missed, mandatory data, major scratch pad message and "INSERT/ERASE" prompts.

YELLOW
indicates a temporary flight plan display.

WHITE
is used t

Line Select Keys


o display data that clarifies page operations, including page titles, data field labals, dashed data fields (no data available), minor scratch pad messages, secondary flight plan data, active
Identified as 1L - 6L and 1R - 6R, provide access to the on-side data for the left and right data fields. The keys transfer data from the scratch pad to the line next to key if acceptable to FMGC. If a caret ( < or > ) appears next to the key, selecting the key accesses another MCDU page.


ht plan "TO" waypoint and predictions, active flight plan destination and predictions and page

Function and Mode Keys




Provides access to the DIR TO page which enables the pilot to proceed directly from the present position to a designated waypoint.




Provides access to the PROGRESS page which displays active flight data concerning the flight plan for the phase of flight during which PROG is selected. Allows the crew to update the flight management position and provides bearing and distance to a specified waypoint.









Provides access to the PERFORMANCE pages which display the performance parameters for the current phase of flight.


Provides access to the flight plan initialization INIT A and B pages. Used to initialize the FMGC parameters. The INIT B page is only available on the ground prior to engine start.







Provides access to the DATA INDEX page, which enables access to a menu for various pages concerning airplane position and status, runways, waypoints, routes and stored data.








Provides access to the FLIGHT PLAN pages, which contain a leg-by-leg description of the active flight plan route. Destination and arrival information is also available on applicable flight plan pages.






Provides access to the radio navigation (RADIO NAV) which enables navaids display and tuning.








Provides access to the FUEL PRED page for review of fuel and time predictions based on the active flight plan and display of GW / CG and FOB.


Provides access to the SEC INDEX page which displays a leg-by-leg description of the secondary flight plan route. Destination and arrival information is also available on applicable flight plan pages.





Currently BLANK





Provides access to the MCDU MENU page, which enables access to systems that use the MCDU for display.








Provides access to the active flight plan page if another page is displayed on the MCDU or, if the F-PLN page is already displayed, the display cycles between the origin and destination.








Provides access to additional pages of related information when another page is required to complete data display. This capability is indicated by the additional page arrow on the MCDU page title line. The NEXT PAGE function wraps around from the last page to the first page.











Used to scroll the display up and down when pages are longer than the available space on the CRT (indicated by arrows in the last two spaces of the scratch pad). These keys are also used for changing data )latitude/longitude) by a set amount.
When pushed, clears messages and data from the scratch pad or an individual data field.









rovides access to the DIR TO page which enables the pilot to proceed directly from the present position to a designated waypoint.

Alphanumeric Keys

Enable entry of letters and numbers into the scratch pad. The slash key " / " is used to separate pairs of entries in the same data field.


OVFY Key

When pushed, aappears in the scratch pad. Line selecting the waypoint to be overflown causes theto appear next to that waypoint designator in the F-PLN, and the lateral flight