(5)
 Winds The system computes a FORECAST wind profile for the active primary F-PLN, which is linear interpolated between and propagated beyond wind entries. This profile is used for the construction of the descent path, and for display on the F-PLN B page: pilot entries are displayed in large green font, forecast interpolated or propagated values in small green font. During cruise only, current wind measured at aircraft position is used as the initial value for the interpolation/propagation process. Wind entries can be made on the following MCDU pages:

 -WIND (access from INIT A page): (Ref. Fig. 043) This page is available only for the active primary F-PLN. Initially, the page title is HISTORY WIND and winds recorded at 5 different flight levels (FL50, FL150, FL250, at the previous and new cruise flight levels) are displayed. They can be modified or cleared: the page title then becomes WIND. The INSERT* prompt must be selected for these winds to be included in the FORECAST WIND profile.
 -FUEL PRED: A cruise wind can be entered for the active primary or alternate F-PLN. The primary F-PLN cruise wind is equivalent to wind at T/C; entry is NOT ALLOWED once T/C is sequenced. Secondary F-PLN cruise wind entry can be made on SEC INIT A page. (Ref. Fig. 044)

 WIND Page
 Figure 043

 Cruise Wind Entry
 Figure 044

 -F-PLN B: Winds can be entered at the origin, destination, and cruise waypoints when T/C and T/D exist. Wind entries made at any other waypoints when predictions are not available are deleted once T/C and T/D are computed. (Ref. Fig. 045)
 -VERT REV: Winds are identical to those on the F-PLN B page, and the same entry rules apply.
 -STEP PRED (access from VERT REV page): (Ref. Fig. 042) A step wind entry can be made before the step is inserted. It is equivalent to the wind upon reaching the step altitude. Note that if a step wind is entered, previous wind entries at step waypoints are deleted when the step is inserted and again later if the step is deleted. However, they remain unchanged if no step wind is entered.
 -DES FORECAST (access from PERF CRZ page): (Ref. Fig. 046) This page is available only for the active primary F-PLN. Wind entries at up to 4 desired altitudes or flight levels can be made on this page according to the wind DIR/MAG/ALT format.
 -PERF APPR: (Ref. Fig. 047) The wind at destination is referenced to magnetic north on this page. The entry is used for the FORECAST descent wind profile and for computing VAPP. This wind is also displayed on the F-PLN B page but referenced to true north.
 Wind entry format is DIR/MAG, where DIR is the direction from which the wind is blowing, in degrees referenced to true north - except for wind at destination which is referenced to magnetic north on the PERF APPR page; and MAG is the wind magnitude in knots. DIR or MAG can be modified individually. On the DES FORECAST page only, entry format is DIR/MAG/ALT.
 E. Data Base The data base is divided into two main parts which are the navigation data base and the performance data base. The navigation data base stores various types of data describing a geographical area in which the A/C flies. This data base is used to create flight plans (laterally and vertically), tune navaids or compute A/C position, perform fuel planning (fuel policy). The performance data base describes the performance models divided into aircraft aerodynamic model and engine model. This data base is used for predictions and optimization.

 F-PLN B Page
 Figure 045

 DES FORECAST Page
 Figure 046

 PERF APPR Page
 Figure 047

 (1)
 DATA INDEX Page (Ref. Fig. 048) This page is displayed via the DATA mode key. Data fields:

 (a)
 1L : access to the WAYPOINTS page.

 (b)
 1R : access to the STORED WAYPOINTS page (if at least one exists) or to the new waypoint page (if no stored waypoint exists).

 (c)
 2L : access to the NAVAIDS page.

 (d)
 2R : access to the STORED NAVAIDS page (if at least one exists) or to the new navaid page (if no stored navaid exists).

 (e)
 3L : access to the RUNWAYS page.

 (f)
 3R : access to the STORED RUNWAYS page (if at least one exists) or to the new runway page (if no stored runway exists).

 (g)
 4L : access to the ROUTES page.

 (h)
 4R : access to the STORED ROUTES page (if at least one exists) or to the new route page (if no stored route exists).

 (i)
 5L : access to the A/C STATUS page.

 (2)
 A/C Status Page (Ref. Fig. 049) The A/C status page reminds the pilot what is the FMGC data base program configuration. This page is displayed through the DATA INDEX page (DATA mode key). Data fields:
　
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