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The forecast winds at a waypoint are determined as follows :
If the predicted altitude at the waypoint matches an altitude defined in the CRUISE
WIND page, the forecasted wind is the corresponding entered or propagated wind, displayed
at that waypoint on the CRUISE WIND page.
If the predicted altitude lies between two altitudes entered on the CRUISE WIND page,
the wind direction and velocity are linearly interpolated.
If the predicted altitude is above or below the set of CRUISE altitudes, the forecasted
wind is a constant value extrapolated from the entered or propagated wind at the highest (or
lowest) altitude displayed on the CRUISE WIND page for that waypoint.
Once in flight, the FMGS considers the real, 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 crew (or ACARS)
entries in large blue font.
Note: The CRZ WIND page displays ACARS or crew entered data. It never displays
computed or propagated data (F-PLN B page only).
Example :
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-20-20 P 8/12
FCOM 19 AUG 10
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 crew 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 CRUISE WIND page :
PRESS the WIND prompt.
SELECT the DESCENT WIND page.
ENTER up to 5 different “wind/altitude”.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-20-20 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.
(The wind direction is then modified of the magnetic variation, if the airfield is magnetic North
referenced).
When the winds have been entered, the F-PLN B page displays the forecast 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 switch from blue to green, and any attempted modification triggers the “NOT
ALLOWED” message.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-20-20 P 10/12
FCOM 19 AUG 10
ENTERING THE ALTERNATE WIND
Alternate wind is entered on the DESCENT WIND page. If an ALTN wind is not defined, the
predictions are computed with a wind defaulted to zero. Alternate wind can be modified at any
time. In addition, the alternate cruise (ALTN CRZ) level defaults to :
FL 220, if the length of the alternate flight plan (ALTN F‐-PLN) is less than 200 nm.
FL 310, if the length of the ALTN F‐-PLN is greater or equal to 200 nm.
The ALTN wind profile is as follows :
ALTN CLB wind : Mean wind between ALTN CRZ wind, as ente‐red on the DESCENT
WIND page, and the wind at primary DEST, as entered on the PERF
APPR page.
ALTN CRZ wind : If no ALTN WIND has been entered on the DESCENT WIND page,‐
the WIND at primary DEST (as entered on the PERF APPR page) is
considered.
In case of no entry by the flight crew, zero wind is assumed.
ALTN DES wind : Mean wind between ALTN CRZ WIND and wind at FL 100.‐
Wind at FL 100 = interpolation between wind at ALTN CRZ FL and zero
at ALTN DEST.
ENTERING THE APPROACH WIND TEMPERATURE AND QNH
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(85)
