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SELECT LAT REV at destination.
SELECT ALTN [ 5L ] key.
SELECT an AIRFIELD IDENTIFIER
INSERT the temporary flight plan
Note: If weather and destination airfield conditions allow it, you may select “NO ALTN”, fuel
predictions will be computed without alternate fuel.
SELECTION OF OTHER ALTERNATE
Fuel management information to another alternate airfield may be obtained by selecting the
OTHER ALTN 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_20-30-10-10 P 22/32
FCOM 19 AUG 10
SELECT LAT REV at destination.
SELECT ALTN [ 5L ] key.
ENTER the airfield ident into the brackets.
• If the airfield is not in the data base, the NEW RUNWAY page appears automatically.
• If the airfield is in the data base and there is a company route (CO RTE) to it, the ROUTE
SELECTION page appears automatically.
SELECT the route as appropriate or RETURN to the ALTN page.
ENTER the distance into the brackets (if required). XTRA fuel and track (TRK) will appear.
SELECT the other alternate (OTHER ALTN) as a primary alternate if it is 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 pilot selects the other alternate as a primary alternate and overwrite 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
A318/A319/A320/A321 FLEET DSC-22_20-30-10-10 P 23/32
FCOM 19 AUG 10
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
• Constant delta ISA (equal to delta ISA at primary destination)
• Airway distance for a company route, otherwise direct distance. (Manually entered distance
for OTHER ALTN, used for preliminary predictions)
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_20-30-10-10 P 24/32
FCOM 19 AUG 10
ENABLE ALTN
This allows 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 upon the circumstances.
TO ACTIVATE THE PRIMARY ALTN :
SELECT a LAT REV at the “TO” waypoint (or at another suitable waypoint)
PRESS the ENABLE ALTN key
INSERT the temporary flight plan
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.
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_20-30-10-10 P 25/32
FCOM 19 AUG 10
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.
ALTERNATE FUNCTION
Applicable to:
DIR KEY (DIRECT-TO FUNCTION)
Applicable to:
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. 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 pilot must not use DIR TO on the ground.
Note: If the autopilot or flight director is in the heading/track or localizer mode, the “DIR TO”
function engages NAV mode.
PROCEDURE
CASE 1. THE “TO” WAYPOINT IS IN THE FLIGHT PLAN
　
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