FMS GENERAL DESCRIPTION
14 MCDU
4.2. GENERAL DISPLAY RULES
Non-valid and Missing Data
For all display fields, only valid data is displayed. If the data is not valid
for display or not available for display, the display field contains dashes
(---).
For example, if performance is calculating optimum altitude, the OPT
FL field should be dashes until the calculation is complete.
When a new page is accessed, it may require that the FM performs
calculations or predictions before all the data to be displayed are
available. In this case, the portion of the display that is available and
can be displayed is presented immediately. However, the data fields
that are not available are left as dashes and filled in as the data
becomes available.
Font size
On the MCDU two sizes of font are used according to the following
rules:
−
Large font to display all data on the data line (line adjacent to LS
key).
−
Small font to display data on the label line.
Data with default values or FM predicted values, which could be
changed by the pilot, are displayed:
−
In small font when the FM supplied data are being used,
−
In large font when the data are pilot entered.
If two data entries are dependent upon each other (such as time and
distance for holding pattern leg) the independent data (those defaulted
to or input by the pilot) are shown in large font and the dependent
data in small font.
If there are active or selected data displayed with non-active or non-
selected data, the active or selected data are displayed in large font
while the other are in small font.
J43126AA 00
© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
Summary of Contents for FMGS
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