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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 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
The wind at destination is entered on the PERF APPR page, in the 3L field. If the airport is
magnetic North-referenced, the PERF APPR page displays MAG WIND. If the airport is true
North-referenced, the PERF APPR page displays TRUE WIND.
The wind entry is copied into the true wind reference on the DESCENT WIND page, at ground
level (GRND), and the F-PLN B page, at destination. A ground entry, on the DESCENT WIND
page, is in the same way, automatically copied to the F-PLN B page and the PERF APPR page
(magnetic or true, depending on the airfield reference).
The wind is modifiable in the descent, approach, and go-around phases.
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 11/12
FCOM 19 AUG 10
SELECT the PERF key on the MCDU
PRESS the NEXT PHASE key (6R)
WRITE QNH and temperature and enter them.
WRITE the surface wind (magnetic or true, depending on the airport reference) into the scratchpad
and enter it.
Note: At each wind entry, the descent profile is recomputed, therefore it is recommended to
enter all winds, temperature and QNH at the same time to minimize recomputation time.
CONSTANT MACH SEGMENT
Applicable to: ,
GENERAL
The pilot can enter the start and end points of a constant Mach segment, and its associated Mach
number from the VERT REV page.
Only one Constant Mach segment may be defined in the active flight plan, and one in the
secondary flight plan. No Constant Mach segment can be defined in the alternate flight plan.
ENTERING A CONSTANT MACH SEGMENT
SELECT the F-PLN key on MCDU.
SELECT a VERT REV at revised waypoint
(except destination and alternate flight plan waypoint).
WRITE the Mach/start waypoint pair.
It is possible to enter only the Mach or the waypoint. But, for the first entry, a Mach entry is
mandatory.
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 12/12
FCOM 19 AUG 10
The waypoint must be located in front of the aircraft and must be part of the cruise.
ENTER it in 4L field
The END WPT prompt appears in the 4R field.
WRITE the end waypoint
The end waypoint must be part of the cruise.
ENTER it in the 4R field
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - OPTIMIZATION
A330/A340 FLEET DSC-22_20-40-10 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The performance function:
Optimizes a flight plan‐
Computes predictions.‐
OPTIMIZATION
Applicable to: ALL
The FMGEC minimizes cost by optimizing the following items:
Takeoff, approach, and go‐-around speeds (F, S, Green Dot, VAPP)
Target speed for CLB, CRZ and DES phases (ECON‐ SPD/MACH)
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.
WIND PROFILE
To obtain the best predictions, the flight crew must enter the wind for the various flight phases and
　
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