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 -primary F-PLN (from origin to destination)
 -alternate F-PLN (from primary destination to alternate destination). After a long-term power interrupt on the ground (more than 4 s.), all defined flight plans are deleted. At power-up, the A/C status page is displayed (Ref. para. E), showing the aircraft model stored by the FMS as well as the data base status. In order to initialize the system, the crew must insert an active flight plan on the INIT page (Ref. para. 2B). The revisions of the flight plan in the lateral dimensions are described in para. C, while the revisions of the vertical flight plan are described in para D. Para. E deals with the navigation and the performance data bases. The navigation data base contains all the elements used to define the various elements of any F-PLN as well as the navigation aids in a region. The data are provided by a data collector chosen by each airline, to the equipment manufacturer, under the format defined in ARINC 424-6. The equipment manufacturer formats these data in a format acceptable by the FMGC. In addition to the customized nav data base, the crew may create up to 20 new waypoints, 20 new navaids, 10 new runways and 3 new company routes. The nav data base contains also up to 8 different fuel policies used for fuel predictions so that up to 8 different airlines may use the same nav data base. The performance data base contains all the data necessary for the system to execute all the performance functions (optimum speeds, predictions along the F-PLN, etc.). The data for 3 different aerodynamic models and 6 different engines of the same manufacturer may be stored in the performance data base.

 2. System Description
__________________
 A. Flight Plan Elements (Ref. Fig. 001) The definition of a flight plan consists in declaring both lateral and vertical elements. The lateral elements are defined by the waypoints and the legs between the waypoints. The vertical elements are mainly defined by the constraints (altitude, time, speed, FPA) at the waypoints, the various limits and predictions along the F-PLN. The pilot may view these elements of the flight plan in the sequence in which they occur on the flight plan page. The description of the fields is:
 -Lines 1L through 5L : Waypoints and legs are displayed along the left side of the page. The label line contains the path defining the leg (airway, SID, STAR). Adjacent to the leg is displayed the bearing (between FROM waypoint and TO waypoint) or the track (between waypoints in lines 2 and 3). Adjacent to the bearing or track is displayed in nautical miles the distance between two successive waypoints (leg length generally). Adjacent to the distance the flight path angle (FPA) may be displayed if an entered terminal area procedure defines the FPA to be flown. The data line contains the termination of the leg. The data in this line may be in parentheses, indicating that the waypoint is a pseudo waypoint. Adjacent to the waypoint is displayed the predicted time at which the aircraft passes the waypoint. On ground this is the elapsed time to the waypoint and in flight, it indicates the predicted time (UTC) at the waypoint. Adjacent to the time are displayed the speed at which the aircraft passes the waypoint in CAS or MACH, and the calculated altitude while crossing the waypoint. It may be an altitude or a flight level.
 -6L : On this line following information is displayed: . airport or runway ident . estimated time of arrival . distance to go to destination along the Flight Plan . estimated fuel on board at destination.
 (1) Lateral Flight Plan Elements
 (a) Definitions
 1_ Lateral defining legs
 The lateral defining legs that may appear on the MCDU are
 contained in the following tables.
 The following table describes the way the legs are coded on
 the Flight plan pages. 

 

 Flight Plan in Cruise
 Figure 001

 

 (Ref. Fig. 002, 003, 004, 005)
 FC and FD legs are coded in navigation data base but they are
 computed as CF (Course to a Fix) legs for system calculations.

 (b) Pseudo waypoints Pseudo waypoints are in the flight plan for pilot reference only. They do not cause any lateral path changes to the aircraft. However, they signify when a vertical occurrence happens in relation to the lateral flight plan. The following table contains all the pseudo waypoints that may appear in the flight plan as displayed on the MCDU. Other pseudo waypoints are displayed on the Navigation Display; their logic and symbol are explained in the EIS definition (Ref. 22-75-00). They are:
 -Level pseudo waypoints
 -Intercept pseudo waypoints
 -Constrained pseudo waypoints
 -Speed change pseudo waypoints.

 Path and Terminator (Sheet 1/4)
 Figure 002

 

 Path and Terminator (Sheet 2/4)
　
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