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WRITE and ENTER the new wind data into the scratchpad.
WIND and temperature may be entered through the ACARS pages. (Refer to DSC-22_20-70-B
WIND DATA - PROCEDURE TO INSERT WIND DATA).
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 7/12
FCOM 19 AUG 10
The crew will modify the entered winds and temperatures in flight, if a significant difference is
expected (greater than 30 kt or 30 ° for the wind data and greater than 5 °C for the temperature).
The system propagates the pilot’s (or ACARS’) wind and temperature entries downpath, until a
waypoint for which a different temperature or wind has been entered (for the same flight level), or
until the last cruise waypoint.
The forecast winds at a waypoint are determined as follows :
If the predicted altitude at the waypoint matches an altitude defined ‐ in the CRZ WIND page, the
forecast wind, is the corresponding entered or propagated wind, displayed at that waypoint on
the CRZ WIND page.
‐ If the predicted altitude lies between two altitudes entered on the CRZ WIND page, the wind
direction and velocity are linearly interpolated.
‐ If the predicted altitude is above or below the set of cruise altitudes, the forecast wind is a
constant value extrapolated from the entered or propagated wind at the highest (or lowest)
altitude displayed on the CRZ WIND page for that point.
Once in flight, the FMGS considers the actual measured wind up to 200 nm ahead of the aircraft to
permanently update the wind profile. This updated wind profile is used to compute the predictions
and the performance data, but is not displayed to the crew.
The CRZ WIND pages display the propagated values in small blue font, and the pilot (or ACARS)
entries in large blue font.
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 8/12
FCOM 19 AUG 10
Note: The CRZ WIND page displays ACARS or crew-entered or propagated data. It never
displays computed data (F-PLN B page only).
Example :
EFFECT OF WIND ENTRIES ON OPTIMUM FLIGHT LEVEL
The OPT FL computation considers the wind entries made at different altitudes (normally at the
different CRZ FL).
When flying the subsequent CRZ FL, the OPT FL proposed by the PROG page may be affected
by the wind entries made at the previous CRZ FL ; these winds are automatically propagated and
may be significantly different from the actual winds.
We recommend the following procedure : If the propagated winds at the lower altitudes are
significantly different from the actual winds, enter the wind at these altitudes, or if not available, the
wind measured at the current CRZ FL.
ENTERING THE DESCENT WINDS
The pilot will enter as many as one wind at 5 different FL or altitudes. This wind data will be used
for descent profile and prediction computation.
From the vertical revision page, or from the CRZ WIND page :
PRESS the WIND prompt.
SELECT the DESCENT WIND page.
ENTER up to 5 different “wind/altitude”.
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 9/12
FCOM 19 AUG 10
A wind is written as true direction/velocity/flight level or altitude in feet.
If the crew enters “GRND” in the altitude field, the system uses the associated wind as wind at
destination.
The descent profile is corrected, as well as the tower wind entered in the PERF APPR page.
When the winds have been entered, the F-PLN B page displays the forecasted wind profile at all
descent waypoints, using values it has interpolated from manual entries. Descent winds are not
modifiable when the descent, approach, or go-around phase is active. At descent phase transition,
wind data switches from blue to green, and any attempted modification will trigger the “NOT
ALLOWED” message.
ENTERING THE ALTERNATE WIND
Alternate wind is entered on the DESCENT WIND page. The altitude is defaulted to FL 220 or 310,
but can be corrected. If an alternate wind is not defined, the predictions are computed with a wind
defaulted to zero.
Alternate wind can be modified at any time.
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 10/12
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(111)
