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specifically for waypoints in cruise.
　 ON GROUND:
During flight planning initialization, enter the winds for the climb and cruise phases using the
HISTORY WIND and WIND pages. Enter manually or with ACARS, different wind values in
the climb and cruise phases. The system will compute a wind for all waypoints of the F-PLN
using linear interpolation between manual/ACARS entries.
The wind profile will be displayed on the F-PLN B page, and is called forecast wind profile.
Flight crew or ACARS entries are displayed in large font, and system-computed winds in small
font.
　 IN FLIGHT:
The system updates the predictions and the current ECON speed, using the measured wind at
the present position. It combines actual wind and forecast winds to compute the wind ahead of
the aircraft, but this is totally transparent to the flight crew.
During cruise, the flight crew will enter the descent winds and the approach wind. The system
will update the final predictions, compute the optimum descent profile and compute the
optimum speed in descent and approach.
The forecast wind profile will be used to compute fuel and time predictions, as well as ECON
speed/Mach targets.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A330/A340 FLEET DSC-22_20-40-10 P 2/6
FCOM 19 AUG 10
OPTIMUM TAKEOFF, APPROACH AND GO-AROUND SPEEDS
The FMGEC computes takeoff speeds (F, S, Green Dot) during the preflight and takeoff phases,
using the performance model in the database and the takeoff weight.
The flight crew has to insert V1, VR, and V2 in the PERF TO page manually.
The FMGEC uses the performance model and either the predicted landing weight or the current
gross weight at transition to the approach phase to compute approach speeds (VLS, VAPP, F, S,
Green Dot). On the PERF APPR page, the selected LDG CONF determines the applicable VLS
and VAPP, the latter being updated by the WIND correction that the flight crew enters on the same
page. The FMGEC uses the performance model and gross weight to compute go-around speeds
(F, S, Green Dot).
OPTIMUM TARGET SPEED FOR CLIMB, CRUISE AND DESCENT (ECON SPD/MACH)
The FMGES computes the optimum target speed (ECON SPD/MACH) as a function of:
The Cost Index (CI)‐
The Cruise Flight Level (CRZ FL)‐
The Gross Weight (GW)‐
The wind and temperature models‐
The performance factor.‐
The computer processes the ECON SPDs for the climb and descent phases before the initiation of
the flight phase, and freezes the values once the flight phase becomes active.
When there is no time or speed constraint/limit, ECON SPEED is the optimum speed for the
selected cost index. It refers to fuel and time cost and not directly to fuel saving.
The FM calculates ECON CLB speed before the climb phase begins, and this speed cannot be
changed during the climb phase itself.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A330/A340 FLEET DSC-22_20-40-10 P 3/6
FCOM 19 AUG 10
The ECON DES speed is used to compute the optimum descent profile and the associated top of
descent (T/D).
The computer continually updates ECON CRUISE MACH (SPD), taking into account current
weather conditions and modifications to the flight plan.
Note: If the cruise FL is below FL 250, ECON CRUISE SPEED is computed.
If the cruise FL is above FL 250, ECON CRUISE MACH is computed.
PRESET TARGET SPEED FOR CLB PHASE
The flight crew can preselect the climb speed before the CLB phase begins, by inserting a
speed in the PRESEL field:
The active mode field changes from MANAGED to SELECTED, and the FM will use the entered
speed for climb predictions computation. The flight crew can revert to managed mode by
pressing the 3L key.
PRESET TARGET SPEED/MACH FOR DES PHASE
The flight crew can change the speed and/or Mach displayed in the MANAGED field, before the
DES phase begins, by inserting a speed and/or Mach in the MANAGED field.
Although the entered speed is selected by the flight crew, the FMGES uses it to compute the
descent flight path and the top of descent. It is therefore, part of the managed descent profile.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A330/A340 FLEET DSC-22_20-40-10 P 4/6
FCOM 19 AUG 10
The flight crew can revert to the optimum speed/Mach by clearing the 3L field.
OPTIMUM FLIGHT LEVEL
The optimum flight level indicates the most economic flight level for a given cost index, weight,
weather data.
It ensures a 15 min minimum cruise time. It is continuously updated in flight until 15 nm from the
　
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