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GENERAL
The ALTERNATE FUNCTION performs two actions :
It reviews and defines alternate airports and ‐ inserts them into the flight plan.
‐ It allows a diversion to be activated through the ENABLE ALTN command.
Using the ALTERNATE function results in the creation of a temporary F-PLN. The function has no
effect on the active F-PLN until the temporary is inserted.
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_20-30-10-18 P 22/44
FCOM 19 AUG 10
REVIEW AND SELECTION OF ALTERNATE AIRPORT
Several alternate airfields may be stored in the database and assigned to a destination. When
the pilot selects a company route (CO RTE) (or a city pair), the computer strings the preferred
alternate into the active flight plan.
The pilot may review the alternate airports on the ALTN page and, if the one selected is not
suitable because of weather or fuel considerations, another alternate may be strung into the active
flight plan.
The pilot may define an additional alternate airport into the list, if necessary.
The ALTERNATE page shows the track and distance (airway or direct) between destination and
alternate, as well as fuel management data (EXTRA fuel, assuming the associated airfield is the
alternate airport). This data will help the pilot change the preferred alternate, if necessary.
Access the ALTERNATE page through the ALTN prompt on the LAT REV page at destination.
Alternate airfields are attached to the destination.
ENTERING NEW ALTERNATE INTO THE F-PLN
If the preferred alternate is unsuitable, proceed as follows :
SELECT F-PLN key on the MCDU.
SELECT LAT REV at destination.
SELECT ALTN [3L].
SELECT an AIRFIELD IDENTIFIER.
ACCESS the temporary F-PLN by pressing the [6L] key. Revise as necessary.
INSERT the temporary flight plan.
Note: If weather and destination airfield conditions permit, you may select “NO ALTN”. Fuel
predictions will be computed without alternate fuel.
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_20-30-10-18 P 23/44
FCOM 19 AUG 10
SELECTION OF ANOTHER ALTERNATE
Fuel management information for flight to another alternate airfield may be obtained by selecting
the OTHER ALTN field.
SELECT LAT REV at DESTINATION.
SELECT ALTN [ 3L ].
ENTER the airfield identifier in the brackets.
• If the airfield is not in the database, the NEW RUNWAY page automatically appears.
• If the airfield is in the database and there is a company route (CO RTE) to it, the ROUTE
SELECTION page automatically appears.
SELECT the route, as appropriate, or RETURN to the ALTN page.
ENTER the distance in the brackets (if required). XTRA fuel and track (TRK) will appear.
SELECT the other alternate (OTHER ALTN) as a primary alternate, if convenient. (EXTRA fuel
and DIST revert to AIRWAY distance).
ACCESS the temporary F-PLN by pressing [ 6L ] key. Revise as necessary.
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_20-30-10-18 P 24/44
FCOM 19 AUG 10
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 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.
The pilot may enter a distance in the OTHER ALTN field. The system will compute the extra
fuel, and the track for this distance.
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_20-30-10-18 P 25/44
FCOM 19 AUG 10
When the OTHER ALTN is selected as a primary alternate, the FMGC will also compute the
predictions for the other alternate.
PREDICTED DATA FOR ALTERNATE
Data predictions are based on :
‐ Aircraft weight being equal to landing weight at the primary destination.
‐ Flight at flight level 220, if the airway distance is less than 200 nm. Otherwise, at flight level
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(98)
