(b)
Mode keys Pressing a mode key causes a new MCDU page to be displayed and allows access to certain functions. The available mode keys are:
-AIRPORT
-F-PLN
-DIR
-PROG
-PERF
-INIT
-DATA
-RAD NAV (Radio Navigation)
-FUEL PRED (Fuel Prediction)
-SEC F-PLN (Secondary flight plan)
(FMGS mode keys)
-MCDU MENU
(multi-purpose key)
-ATC COMM (optional Air Traffic Control mode key for datalink communication).
(c)
Function keys
The function keys are described below.
-NEXT PAGE = causes horizontal slewing to occur.
-
(Slew up) = causes upward vertical slewing to occur.
-
(Slew down) = causes downward vertical slewing to occur.
-CLR = allows clearing of scratchpad and data fields.
-Delta (OVFY) = enters a Delta into the scratchpad.
(3)
Front panel annunciators There are three illuminable annunciators on the MCDU front panel:
-FAIL: This annunciator comes on (amber) when the MCDU has failed.
-MCDU MENU: This annunciator comes on (white) when a system linked to the MCDU requests the display.
-FMGC: This annunciator comes on when the FMGC is not active and when it has sent an important message.
(4)
Brightness Knob (BRT) The BRT knob allows brightness adjustment of the screen.
R **ON A/C 004-049, 054-099, 101-149, 151-199, 201-299, 301-399, 401-499,
A. MCDU Front Panel
(Ref. Fig. 003A)
(1) The screen The MCDU display contains 14 lines, each having 24 characters. Of these 14 lines, the top line (line 1) is normally used as a title line or to display data to which the pilot does not have access. The bottom line (line 14) is the scratchpad line and is used by the pilot to alter the data in the data fields. Lines 2 through 13 are data lines arranged into six pairs (lines 2-3, 4 -5, 6-7, 8-9, 10-11, 12-13). Each pair of lines has a label line (the top of the two lines) and a data line. The data lines are adjacent to the line select keys, and the label line is just above the data line. The line pairs are referenced by line select keys as follows:
Reference CRT lines 1L - 1R 2 - 3 2L - 2R 4 - 5 3L - 3R 6 - 7 4L - 4R 8 - 9 5L - 5R 10 - 11 6L - 6R 12 - 13
The line select keys allow entry of data into a field and access to a data or a function identified by that field.
(2) The keyboard
(a) Alphanumeric keys Pressing an alphanumeric key (O through 9, A through Z, . (full point), + (plus), - (minus) and / (slash)) enters that character into the scratchpad of the MCDU.
1EFF : ALL 1 22-82-00Page 6 1 1 Aug 01/05 1 1 1CES 1
MCDU Front Panel
Figure 003A
(b)
Mode keys Pressing a mode key causes a new MCDU page to be displayed and allows access to certain functions. The available mode keys are:
-AIRPORT
-F-PLN
-DIR
-PROG
-PERF
-INIT
-DATA
-RAD NAV (Radio Navigation)
-FUEL PRED (Fuel Prediction)
-SEC F-PLN (Secondary flight plan)
(FMGS mode keys)
-MCDU MENU
(multi-purpose key)
-ATC COMM (optional Air Traffic Control mode key for datalink communication).
(c)
Function keys
The function keys are described below:
-NEXT PAGE = causes horizontal slewing to occur.
-
(Slew up) = causes upward vertical slewing to occur.
-
(Slew down) = causes downward vertical slewing to occur.
-CLR = allows clearing of scratchpad and data fields.
-Delta (OVFY) = enters a Delta into the scratchpad.
-two spare keys.
(3)
Front panel annunciators There are three illuminable annunciators on the MCDU front panel:
-FAIL: This annunciator comes on (amber) when the MCDU has failed.
-MCDU MENU: This annunciator comes on (white) when a system linked to the MCDU requests the display.
-FMGC: This annunciator comes on when an FM page is not displayed.
(4)
Brightness Knob (BRT) The BRT knob allows brightness adjustment of the screen.
R **ON A/C ALL
B. Internal Description
(Ref. Fig. 004, 005, 006)
The MCDU includes:
-an input/output board for the acquisition of the data originating from the front panel, the discrete inputs and six ARINC buses (5 operational
+ 1 provision) for the transmission of an ARINC bus and a discrete output (MCDU fail).
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