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‐ Flight Level (for flight crew's information)
‐ Descent profile from CRZ FL down to the destination airport.
These items depend on the data the flight crew inserts during lateral and vertical flight planning and
revision procedures.
Most are displayed on the PERF pages associated with the appropriate flight phases.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
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FCOM 19 AUG 10
WIND PROFILE
To obtain the best predictions, the flight crew must enter the wind for the various flight phases and
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 AOC, 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/AOC entries.
The wind profile will be displayed on the F-PLN B page, and is called forecast wind profile.
Flight crew or AOC 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.
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.
OPTIMUM TAKEOFF, APPROACH AND GO-AROUND SPEEDS
The FMGC 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 FMGC 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
FMGC uses the performance model and gross weight to compute go-around speeds (F, S, Green
Dot).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A318/A319/A320/A321 FLEET DSC-22_20-40-10 P 12/16
FCOM 19 AUG 10
OPTIMUM TARGET SPEED FOR CLIMB, CRUISE AND DESCENT (ECON SPD/MACH)
The FMGS computes the optimum target speed (ECON SPD/MACH) as a function of:
‐ Cost index (CI)
‐ Cruise flight level (CRZ FL)
‐ Gross weight (GW)
‐ Wind and temperature models
‐ 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, ECON DES and the associated top of climb and top of descent as
a function of cost index, cruise FL, and meteo data.
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A318/A319/A320/A321 FLEET DSC-22_20-40-10 P 13/16
FCOM 19 AUG 10
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 chosen by the flight crew, the FMGS uses it to compute the
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(119)
