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A330/A340 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.
WRITE and ENTER the new wind data into the scratchpad.
WIND and temperature may be entered through ACARS pages. Refer to DSC-22_20-70 FLIGHT
PLAN INITIALIZATION THROUGH ACARS OR ATSUif ACARS is installed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-20-25 P 7/12
FCOM 19 AUG 10
The crew should 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 FMS propagates the crew (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 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_20-30-20-25 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_20-30-20-25 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.
(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
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(88)
