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 (b) Fuel initialization (Ref. Fig. 021) The purposes of this function is to initialize weights and display fuel predictions for the flight. When the pilot has access to the INIT B page for the first time (next page from INIT A page during DONE flight phase and during PREFLIGHT phase prior to engine start) the flight plan, cruise flight level and cost index have normally already been inserted. The pilot has then to insert the ZFW.
 -The pilot must then enter a BLOCK FUEL. By this action, the pilot initiates the fuel prediction function. The system then computes the flight plan predictions including time and fuel at each waypoint. Landing weights, alternate fuel and extra fuel are also computed.
 (2)
 Alternate F-PLN The alternate flight plan is defined with the same structure as the primary active flight plan. The destination airport of a company route may designate a preferred ALTN destination airport or company route. It is possible to select an alternate destination (which can be different from the preferred alternate). Any time the primary destination is changed, the preferred ALTN for the new primary destination is strung into the flight plan. If a new flight plan is inserted with the same primary destination, the previously defined alternate flight plan remains unchanged.

 (3)
 Secondary F-PLN (Ref. Fig. 022, 023)

 (a) Secondary index The secondary flight plan key on the front panel of the MCDU gives access to the secondary INDEX page. Initialization of the secondary flight plan may be performed by:
 -pressing the LSK adjacent to the COPY ACTIVE indication which copies active flight plan parameters into secondary flight plan

 Fuel Initialization
 Figure 021

 

 No SEC F-PLN Existing
 Figure 022

 

 SEC F-PLN Already Existing
 Figure 023

 

 -pressing the LSK adjacent to the INIT indication which gives
 access to the secondary INIT pages. DELETE SEC : This function clears all lateral and vertical elements from the secondary flight plan that reverts to its initial default state. Any parameter defined above that have default values revert to those values for the secondary. ACTIVATE SEC : This function activates the secondary flight plan by copying from the secondary flight plan to the active flight plan those parameters defined above. However the SEC F-PLN remains unchanged.
 (b) SECONDARY INIT pages The secondary INIT pages A and B are identical to the active flight plan INIT pages (SEC INIT A page displays the CRZ WIND instead of WIND prompt). The initialization on SEC INIT page A and B is performed in the same way as for active F-PLN on INIT pages A and B.
 1_ Lateral flight plan,
 2_ Vertical flight plan,
 3_ Temperature Entries,
 4_ Wind Entries,
 5_ Cost Index,
 6_ Route Reserve (RTE RSV),
 7_ Reserve holding fuel/time (FINAL/TIME),
 8_ Destination QNH (DEST QNH),
 9_ Descent forecast Wind Entries,
 10__ Selected mode and preselected performance modes, (as defined
 in Perf pages)

 11 CO RTE Number and FROM/TO
__
 The active flight plan remains unchanged.

 C. Lateral Revisions
 (1)
 General
 There are two types of lateral revisions:

 -direct revisions on the flight plan performed either on F-PLN page or DIR TO page
 -revisions through Lateral Revise page (LAT REV page) which create a
 temporary flight plan and request another pilot action. All revisions available on LAT REV page are:
 -DEPARTURE insertion
 -ARRIVAL insertion
 -Next waypoint insertion
 -New destination insertion
 -Offset
 -Holding Pattern insertion
 -VIA/GO TO insertion
 -Select an alternate flight plan
 -Enable alternate flight plan. All revisions described in the following paragraphs are available for primary and secondary flight plans except that there is no temporary flight plan for the secondary F-PLN (the rest of the mechanization is unchanged), and the ERASE and INSERT prompts are replaced by the cyan RETURN prompt. Access to the LAT REV page is achieved from the F-PLN page when a left line select key adjacent to a waypoint is pressed. Following the location of the waypoint in the flight plan, the LAT REV page presents different displays (each revision is not allowed at each waypoint). There are four different LAT REV pages: (Ref. Fig. 024) - one at origin waypoint - one at the FROM waypoint - one at destination waypoint - one at any waypoint other than the three above.

 (2)
 Temporary F-PLN The temporary flight plan is a copy of the active flight plan which has been changed according to the pilot action on the MCDU. It is created when the active flight plan is changed through the LAT. REV pages only. The aircraft continues to be guided on the original active flight plan. At any time only one temporary flight plan is allowed to exist and it is available on both sides : it is displayed on both MCDUs and both Navigation Displays.
　
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