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The FMGS does not consider the trip wind for alternate predictions.
The trip wind is used as long as no winds are entered in the CLB, CRZ and DES WIND pages.
When the pilot enters a CLB, CRZ or DES WIND, the FMGS disregards the trip wind.
PRESS the INIT key.
INSERT the temperature at cruise FL.
On the INIT B page, INSERT the TRIP WIND.
The trip wind is defined as a headwind component (HDXX, XXHD or – XX), or as a tailwind (TLXX,
XXTL or + XX).
The FMGS uses the trip wind to compute preliminary performance, time and fuel predictions.
CHECK the predictions on the F-PLN B page.
ENTERING THE WIND AND TEMPERATURE DURING F-PLN INITIALIZATION
When completing the INIT A page, and once the wind and cruise FL temperature forecasts are
available, the pilot may enter them, if significantly different, by pressing the wind prompt.
The pilot will access the different wind pages by using the NEXT PHASE and PREV PHASE
prompts. He will slew the CRZ WIND page to access the various cruise wind waypoints.
The pilot will enter wind data as follows :
‐ For climb phase : By inserting either the HISTORY WIND data (as recorded during the last
descent), or by inserting winds (at up to 5 altitudes) on the CLIMB WIND page.
For cruise phase : By inserting winds (at up to 4 FL) at various ‐ CRZ waypoints on the CRZ
WIND pages. The 4 levels are the same for all the cruise waypoints. The pilot may enter the
temperature of each waypoint and at destination on this page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-25 P 4/12
FCOM 19 AUG 10
‐ For descent phase : By inserting winds (at up to 5 FL/altitudes) on the DES WIND page.
‐ For the ALTN F-PLN, an average wind may be entered on the DES WIND page for alternate
cruise flight level.
Note: Wind can be automatically received (and inserted) through the ACARS system (Refer to
DSC-22_20-70-B WIND DATA - REQUEST FOR WIND DATA).
Once a CLIMB, CRZ, or DESCENT WIND is entered, the system ignores the TRIP WIND.
Once temperature and winds are inserted, the FMGS computes the ISA profile, and the F-PLN B
page displays the forescast wind profile (by linear interpolation and propagation).
WIND ENTRY RULES
When a wind entry is performed from an empty field, direction/velocity/altitude (or flight level)
must be entered simultaneously. One entry in each bracket.
Overwriting a wind cancels the previous one.
Entered wind data can be cleared : The field reverts to brackets.
Propagated wind cannot be cleared.
Entering a new altitude, over an existing altitude, replaces that existing altitude at all cruise
waypoints. Any winds entered at the overwritten altitude are lost at all cruise waypoints.
ENTERING THE HISTORY WIND (F-PLN INITIALIZATION)
The pilot may insert the history wind, but cannot modify this page.
If convenient, PRESS the (6R) prompt to insert. After insertion, the [6R] prompt is suppressed,
but the page still displays the wind values for information.
ENTERING THE CLIMB WIND (F-PLN INITIALIZATION)
If history winds are not convenient :
SELECT CLIMB WIND page from INIT A page or VERT REV page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-25 P 5/12
FCOM 19 AUG 10
WRITE new winds into the scratchpad and ENTER.
Winds entered on the CLIMB, CRZ, and DESCENT WIND pages are always true north
referenced.
Tower wind, entered on PERF APPR page is magnetic-referenced.
The pilot can enter “GRND” in the altitude field for wind at destination.
CLIMB WIND cannot be modified when the climb phase is active.
At climb phase transition, wind data switches from blue to green, and any attempted
modification will trigger the “NOT ALLOWED” message.
The system extrapolates the highest wind entry to all higher levels.
The system interpolates winds between 2 entered levels.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-25 P 6/12
FCOM 19 AUG 10
ENTERING THE CRUISE WINDS AND TEMPERATURES
At flight plan initialization, the CRZ WIND page displays all cruise waypoints with empty brackets.
In flight, only downpath waypoints are displayed.
SELECT VERT REV at WPT.
PRESS the WIND prompt.
SELECT NEXT PHASE.
SLEW until relevant waypoint is displayed.
WRITE and ENTER the new temperature into the scratchpad.
　
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