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replace any alternate on the initial list.
‐ If the pilot 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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
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FCOM 19 AUG 10
The pilot may enter a distance in the 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 primary destination.
• Flight at FL 220 if the airway distance is less than 200 nm ; otherwise, at FL 310.
• Cost index 0.
• Constant wind (as entered in the alternate field of the DES WIND page).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 30/42
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 the OTHER ALTN field (used only for preliminary predictions).
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 the NAV mode.
Three functions are available through the DIR TO key :
The DIR TO defines a direct leg from the 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 the 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 the definition of a specified RADIAL INBOUND or
OUTBOUND at 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
between the current aircraft track and the intercept radial exceeds 160 °.
PROCEDURE FOR DIR TO WAYPOINT
CASE 1. THE “TO” WAYPOINT IS IN THE FLIGHT PLAN
Example : DIR TO FRZ
PRESS the DIR key on the MCDU.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 31/42
FCOM 19 AUG 10
PRESS the line select key next to “FRZ”.
CASE 2. THE “TO” WAYPOINT DOES NOT BELONG TO THE FLIGHT PLAN
Example : Direct to ABC (ABC being an ident, LL or PBD or PB/PB)
PRESS the DIR key.
WRITE the waypoint identifier (e.g. ABC) into the scratchpad.
PRESS [1 L] to enter “ABC” in the “DIR TO” field.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 32/42
FCOM 19 AUG 10
Clear the discontinuity and the waypoints that are not included in the new flight plan.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-10-15 P 33/42
FCOM 19 AUG 10
PARTICULAR CASES FOR USE OF DIR TO
If the pilot is flying a manual leg (part of a SID or STAR), ‐ the flight plan page dislays “F-PLN
DISCONTINUITY”, preceded by “MANUAL” (see below).
These legs are specific heading or track legs flown with no defined end waypoint.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(82)
