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above the alternate airport, for 30 min, with the aircraft in CONF1 at
maximum endurance speed (racetrack pattern, altitude and selected airport
can be modified through the “airline fuel policy” section of the database).
[ 6L ] EXTRA/TIME
(green)
This field displays the amount of extra fuel, and the available time it
represents for holding over to the alternate or primary destination, if the pilot
did not define an alternate.
EXTRA FUEL = BLOCK - (TAXI + TRIP + RSV + ALTN + FINAL).
The field displays information in small font, and the flight crew cannot modify
it.
[ 1R ] ZFWCG/ZFW The zero fuel weight and the location of the zero fuel weight CG are
mandatory entries that allow the system to compute speed management and
predictions. The pilot can modify this data.
[ 2R ] BLOCK The block fuel in this field is a mandatory entry that allows the system to
predict the Estimated Fuel on Board (EFOB).
When the pilot enters a block fuel, the title of the page changes to INIT
FUEL PREDICTION.
The FMGC may also compute the block, if the pilot selects the FUEL
PLANNING function.
[ 3R ] FUEL
PLANNING(amber)
Pressing this key initiates an FMGC block fuel computation.
When the pilot selects this function, FUEL PLANNING becomes green, and
the BLOCK field is dashed during FMGC computation. The title of the page
changes to INIT FUEL PLANNING, and BLOCK CONFIRM* replaces the
FUEL PLANNING prompt, when the block fuel is computed by the FMGC. If
the pilot modifies the parameters used for the prediction computation before
confirmation, the computation restarts automatically and FUEL PLANNING
is displayed in green.
Note: If the pilot enters a number in field 1R or 2R that exceeds the limits, the field displays
“ENTRY OUT OF RANGE” and does not accept the value.
[ 4R ] TOW (green) This field displays the computed takeoff weight.
The pilot cannot modify it (small font).
[ 5R ] LW (green) This field displays the computed landing weight at the primary destination.
The pilot cannot modify it (small font).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
A330/A340 FLEET DSC-22_20-50-10-20 P 14/116
FCOM 19 AUG 10
[ 6R ] TRIP WIND This field allows the entry of a mean wind component for the trip from
the primary origin to the primary destination. Upon entry of a CO RTE or
FROM/TO pair, this field defaults to HD 000 in blue small font.
An entry preceeded by –, H, HD is considered as headwind, +, T, TL as
tailwind. The entered velocity is displayed in blue large font.
As soon as the crew inserts a wind on the CLIMB, CRUISE or DESCENT
WIND page, the SYSTEM no longer considers the trip wind.
FUEL PREDICTION PAGE
Applicable to:
The pilot presses the FUEL PRED key on the MCDU console to display fuel prediction information
at destination (DEST) and alternate (ALTN), as well as fuel management data after the engines are
started. The pilot may also select a final Gross Weight value for jettison operation.
Line 1
AT-UTC/TIME-EFOB
These fields display predictions of time and fuel to the primary destination.
TIME is displayed before takeoff, UTC predictions after takeoff. After the
pilot enters an Estimated Takeoff Time (ETT), the UTC is displayed.
Line 2
AT-UTC/TIME-EFOB
These fields display predictions of time and fuel to the alternate airport.
Refer to DSC-22_20-30-10-10-F ALTERNATE FUNCTION - GENERAL.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
A330/A340 FLEET DSC-22_20-50-10-20 P 15/116
FCOM 19 AUG 10
[ 3L ] GW/CG GW
The system continually updates gross weight during the flight. If no zero fuel
weight has been entered, the screen displays amber boxes next to this key.
The pilot must enter information in these boxes in order to obtain a speed
profile, speed computations, and predictions. The field displays dashes, as
long as the system is not calculating fuel on board.
CG
The system continually updates the center of gravity location along the flight
path. If no center of gravity has been entered, the screen displays amber
boxes next to this key. The pilot must enter information in these boxes in
order to obtain a speed profile, speed computations and predictions.
The pilot can modify both the GW and CG.
Line 3 FOB This field displays the fuel on board, computed by the FCMC (or FE as
backup).
The flight crew cannot modify this number.
[ 4L ] RTE RSV/% Prior to departure, this field displays the route reserve fuel and the
　
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