Performance Approach Page
 Figure 017

 SEC INDEX Page (with no Defined Secondary F-PLN)
 Figure 018

 Secondary F-PLN Page A at Origin
 Figure 019

 B. Initialization
 (1) Active F-PLN
 (a) F-PLN initialization (INIT A page) The initialization is performed on the INIT A page. Access to this page is achieved by:
 -INIT key on the front panel of the MCDU when the aircraft is in PREFLIGHT or DONE phase (NOT ALLOWED message is displayed for other flight phases).
 -Next page from INIT B page.
 -RETURN or INSERT line selection from RTE selection page when accessed from INIT A page.
 -INSERT line selection from WIND page.
 The major purpose is to declare the flight plan origin and
 destination (FROM/TO) or to call up a prestored company route.

 1_ Company route entry
 The company route when entered designates all or any portion
 of the primary route. It may result in the designation of
 alternate destination.
 Before the newly entered data is incorporated into the flight
 plan, the existing flight plan is cleared (including the
 entire lateral definition waypoints and all the vertical
 defining elements).
 A cost index and a CRZ FL may be defined by the primary
 company route entry if they are stored with it.
 In addition to the origin and destination airports, a company
 route may designate all the elements required to define all
 the legs between origin and destination runways.
 2_ FROM/TO designation
 The pilot may enter origin and destination airports on the
 INIT A page.
 The origin and destination must be either data base or pilot
 defined airports (using the defined RWY function).
 The FMGC proposes a ROUTE SELECTION page to select the desired
 route (vertical slewing allowing access to the subsequent CO
 RTE'S one by one).
 Then the system deletes the existing F-PLN and strings a
 skeleton F-PLN (origin airport/F-PLN DISCONTINUITY/destination
 airport) if no CO RTE is selected or the CO RTE is as selected
 on ROUTE SELECTION page.
 (Ref. Fig. 020) 

 F-PLN Initialization
 Figure 020

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LAT/LONG ENTRY Upon entry of a company route or FROM/TO, the LAT/LONG of the origin airport reference point will be displayed. The pilot may also enter a LAT or LONG via the scratchpad. After entry, LAT will have the slew prompts adjacent to it. Pressing the LONG line select key with scratchpad empty moves the slew prompts to LONG. By pressing the vertical slew keys the LAT or LONG magnitude will be incremented or decremented by 1 minute per key press (regardless of N, S, E or W). This entry is used for IRS alignment (Ref. 22-72-00).
COST INDEX entry The COST INDEX may be entered via a company route entry if cost index is contained in the CO RTE. It may also be entered or changed by the pilot. If the COST INDEX has not been entered prior to entering ZFW on INIT B page or GW on FUEL PRED page, it defaults to the previously entered value (last flight). When the pilot enters ZFW or GW a message USING COST INDEX-NNN is displayed alerting the pilot that a default COST INDEX is used.
CRZ FL/TEMP entry The cruise altitude may be entered via a company route if CRZ FL is contained in the company route. It may also be entered or changed by the pilot. The pilot cannot enter a CRZ TEMP until a CRZ FL is defined. When CRZ FL is entered manually without entering the temperature, or inserted via a CO RTE, the CRZ TEMP defaults to the ISA temperature and thus is displayed in small font. If the CRZ altitude is changed, the CRZ temp changes such that the ISA remains the same for old and new altitudes.
TROPOPAUSE entry Tropopause altitude defaults to 36,090 ft. but may be changed by the pilot.
WIND entry When the pilot gains access to the WIND page for the first time, the title HISTORY WIND is written in large font (this title is displayed until a wind component is changed or WIND page is inserted). The WIND page displays the measured wind encountered during the last active descent. The HISTORY WIND can then be used for the next flight as a basis for climb wind definition by:

 -either pressing the insert key which inserts the displayed history winds into flight plan and changes the page to INIT A
 - or modifying a wind component which loads the newly defined winds into flight plan. If HISTORY WIND has been inserted and then reaccessed or if a wind component has been changed, the display changes to the WIND page. A wind change is then automatically taken into account. Pressing the INIT mode key reverts to INIT A page.
　
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