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 D. Data Entry
 (1) Scratchpad and data field entry Data are entered into the computer through the MCDU keyboard. First the data are entered from left to right into the scratchpad by pushing the alphanumeric keys on the keyboard (similarly to a typewriter). Only 22 characters may be entered into the scratchpad. If more than 22 are entered, they will be ignored and only the first 22 will be used. The 23rd character will not be accepted by the computer and the computer will give no response.

 Page Hierarchy (Sheet 1/6)
 Figure 004

 

 Page Hierarchy (Sheet 2/6)
 Figure 005

 

 Page Hierarchy (Sheet 3/6)
 Figure 006

 

 INTENTIONALLY BLANK

 1 1

22-74-00Page 14
1 1 Config-1 Nov 01/02 1 1 1CES 1

 Page Hierarchy (Sheet 4/6)
 Figure 007

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 22-74-00Page 15/16 1201-212, 1Config-1 May 01/05 1 1 1CES

 Page Hierarchy (Sheet 5/6)
 Figure 008

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 22-74-00Page 17/18 1201-212, 1Config-1 May 01/05 1 1 1CES

 Page Hierarchy (Sheet 6/6)
 Figure 009

 

 After the data are entered into the scratchpad, the data are moved from the scratchpad into the correct data field by pushing the adjacent line select key, and the scratchpad is blanked. The computer checks the data for format and acceptability (out of range, entry not allowed into the field, etc.). If the data are incorrect, the system will leave the previous data in the data field and display the associated message indicating the error in the scratchpad. To enter the correct data, the pilot must do either of the following:
 -Clear the message from the scratchpad by pushing the CLR function key. The data that was incorrect will appear in the scratchpad. The pilot can then correct the data or clear it out.
 -Enter new data into the scratchpad. This automatically clears the message being displayed and replaces the previous (incorrect) scratchpad data with the new data.
 If the entry was rejected because an incorrect line select key was pushed, then the entry will be accepted if the correct line select key is pushed. To clear the scratchpad of entered data or incorrect data, the CLR function key can be used. When the CLR function key is pushed, this erases the last character entered in the scratchpad.If the CLR key is held pushed for two seconds, the entire scratchpad data are cleared. Certain data entries into a field also cause the displayed page to be changed automatically. In this case, any scratchpad data is deleted. Otherwise, scratchpad data are retained when the displayed page is changed. During a page change, scratchpad entries are ignored.
 (2)
 Clearing data field Data fields on the MCDU can be cleared using the CLR function key. Pushing the CLR function key when the scratchpad is empty results in CLR being displayed in columns 6 through 8 of the scratchpad. Then, pushing the line select key adjacent to the data field results in clearing that data and the scratchpad line is cleared. If the data is a value not all data fields may be cleared. If the data have a default or computer calculated value, the data revert to this value. If the default value is cleared the clearing has no effect and there is no message displayed. To remove a CLR prompt from the scratchpad the CLR key can be pushed again once or any alphanumeric key can be pushed erasing the CLR in the scratchpad and entering the alphanumeric. The computer must distinguish between the CLR function key and C-L-R being entered into the scratchpad via alphanumeric keys. C-L-R does not enable the clearing function.

 (3)
 Data field display Generally a data is displayed on two lines:

 -
the label line above the data line

 -
the data line next to the line select key.
 On the data line there are five kinds of display:

 

 

 

 (a)
 Cyan data if the data is already in the computer and the pilot can modify it.

 (b)
 Green data if the data is already in the computer but it cannot be modified by a pilot entry.

 (c)
 Cyan brackets if no value is defined and the pilot can enter a data.

 (d)
 Amber boxes if no value is defined and the data entry is mandatory for the correct functioning of the system or for the achievement of the function described on the page or on the label line.

 (e)
 White dashes if the field is filled by the computer but not yet available due to lack of information or a computation has not yet been achieved. The entry format of a data is described by the number of boxes or the place occupied by the brackets and the spaces between brackets. On one data line, several data may be displayed and entered: the different fields are separated by a slash. Each field may be entered separately; it is identified by the number of slashes in front of the entered data.
　
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