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 data pages required for the start-up of the FMCS and IRS. Also, the operator may select various reference data and maintenance pages.
 2)  N1 LIMIT key, permits manual command of the active N1 limit, and selection of any N1 Limit Derate that may apply.
 3)  DEP/ARR (departures/arrivals) key, is used for selection of the procedures and runways at the operator entered origin and destination airports.
 4)  RTE (route) key, gives access to flight plan data selections and entries into the FMC in clearance language. This will probably be the primary key for entry of lateral flight plan information.
 5)  LEGS (route legs) key, displays and accepts entries of detailed data concerning each leg of the flight plan for both the lateral and vertical paths.
 6)  HOLD key, permits planning or initiation of holding at a designated waypoint.
 7)  DIR/INTC (direct/intercept) key, provides data for a direct course, or interception of a flight planned course to any point designated by the pilot.
 8)  FIX (fix information) key, displays range and bearing data from the present position to an entered fix.
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 9)  PROG (flight progress) key, displays current flight status information such as ETA, fuel remaining at waypoint, navigation radio tuning status, wind, and path errors.
 (4)  The remaining key of this category is the EXEC (execute) key. This key is used to incorporate displayed data in the FMC for implementation as part of the active flight plan. The EXEC key is operable when its annunciator bar is illuminated. The key is used for activating the flight plan, changing the active flight plan, changing the active guidance mode, or inserting data that affects the active flight plan, guidance mode, or data base. Illumination of the white annunciator bar indicates that a valid set of data is on display and may be made active for guidance of the airplane.
 E.  Page Select Keys
 (1)  If a function has more than one page of display data associated with it, the page number block at the upper right corner of the CRT display will indicate this. The page number actually consists of two numbers separated by a slash. The first number indicates what page is currently displayed, and the second number indicates total number of pages in the string. Pressing the NEXT PAGE key advances the display to the next higher numbered page, while pressing the PREV PAGE key backs up the display to the next lower numbered page. The page strings are continuous, however, in that advancement past the last page in a string (beyond 9/9, for example) would take the display back to the first page in the string (1/9, in this case). Similarly, if the first page of a string is displayed and the PREV PAGE key is pressed; the display shows the last page in the string.
 F.  Scratch Pad Usage and Line Select Keys
 (1)  All manual data entries appear initially in the scratch pad area of the display. In the scratch pad they can be verified and, if necessary, edited. Entry of the data into the operational display is accomplished by pressing an appropriate line select key (LSK). Twelve LSKs are provided on the CDU panel, six to the left and six to the right of the display screen. The placement of the LSKs aligns them with the third, fifth, seventh, ninth, eleventh, and thirteenth lines of the display. Data entries are permitted in those lines only, and in any given display the LSKs are active only at those locations in which entries are permitted or required. Some displays provide menus of function or mode options that can be selected by the operator, and in these cases the LSKs are used to accomplish that selection.
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 (2)  In addition to transferring data from the scratch pad up to the data display, the LSKs can be used to duplicate data from the display lines into the scratch pad. This is done when the scratch pad is blank, simply by pressing the LSK associated with the data desired for duplication in the scratch pad. The data appears in the scratch pad and, by use of the LSKs, may then be transferred up to another data line of the display from which it was selected; or to any other display with data fields for which it is valid.
　
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