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SELECT the other alternate (OTHER ALTN) as a primary alternate, if convenient. (EXTRA fuel
and DIST revert to AIRWAY distance).
INSERT it, if you want to have it as a primary alternate.
Note: The pilot can always overwrite the “OTHER ALTN”. The new “OTHER ALTN” then‐
replaces the previous one, which is lost.
The pilot can select OTHER ALTN as a primary alternate (active flight plan), to‐
replace any alternate on the initial list.
If the pil‐ot selects the other alternate as a primary alternate, and overwrites the
OTHER ALTN field by entering a new airport, the first one will remain a primary
alternate and the system will memorize a second OTHER ALTN .
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 30/44
FCOM 19 AUG 10
The pilot may enter a distance in OTHER ALTN field. The system will compute the extra fuel,
and the track for this distance.
PREDICTED DATA FOR ALTERNATE
Data predictions are based on :
• Aircraft weight being equal to landing weight at the primary destination.
• Flight at flight 220, if the airway distance is less than 200 nm; otherwise, at flight level 310.
• Cost index 0
• Constant wind (as entered in the alternate field of the DES WIND page).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 31/44
FCOM 19 AUG 10
• Constant delta ISA (equal to delta ISA at primary destination)
• Airway distance for a company route, otherwise direct distance manually entered by the pilot
in OTHER ALTN field (used only for preliminary predictions).
ENABLE ALTN
Applicable to: ,
This enables the pilot to initiate a diversion by entering the alternate flight plan just after the revision
waypoint (with a discontinuity).
The pilot may have to adjust the resulting flight plan (use “direct to”, or add or suppress waypoints),
depending on the circumstances.
TO ACTIVATE THE PRIMARY ALTN:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 32/44
FCOM 19 AUG 10
SELECT a LAT REV at the “TO" waypoint (or at another suitable waypoint)
PRESS the ENABLE ALTN key
INSERT the temporary F-PLN.
ENTER an appropriate waypoint in DIRECT TO and adjust the flight plan.
ADJUST the cost index on the PERF page and the defaulted cruise flight level (CRZ FL) on the
PROG page, as required.
When ENABLE ALT is pressed at ABE, a flight plan discontinuity is created from ABE down to
destination and the alternate route is linked to the active flight plan.
DIR KEY (DIRECT-TO-FUNCTION)
Applicable to: ,
GENERAL
The pilot uses the “Direct To” function to define a direct leg from the present position to any
waypoint on the active flight plan or to any waypoint.
The designated waypoint may be entered by its identifier (if it is stored in the database) or by a
latitude/longitude, place/bearing/distance, or a place-bearing/place-bearing.
Note: If the autopilot or flight director is in the heading/track or localizer mode, the “DIR TO”
function engages NAV mode.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A330/A340 FLEET DSC-22_20-30-10-15 P 33/44
FCOM 19 AUG 10
Three functions are available through the DIR TO key :
the DIR TO defines a direct leg from present position to a specified waypoint.‐
NAV mode engages simultaneously to the DIR TO selection.
When the pilot uses DIR TO, the present position (PPOS) becomes the “FROM” waypoint and
the active flight plan shows it as T-P (turn point).
the DIR TO/ABEAM function, defines the abeam waypoints along the direct leg. These‐
waypoints are the projection on the direct leg of the initial F-PLN waypoints located between the
aircraft position and the specified waypoint.
NAV mode engages simultaneously to the DIR TO/ABEAM selection.
the DIR TO/INTCPT function allows to define a specified RADIAL INBOUND or OUTBOUND‐
an inserted waypoint. The current aircraft track is used to compute the INTCPT point with the
specified radial.
NAV mode is armed simultaneously to the DIR TO/INTCPT selection.
The ND displays the DIR TO leg as a temporary flight plan leg between current aircraft position
and specified waypoint. In case of a DIR TO/INTCPT the leg is not displayed when the angle
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(80)
