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flight plan. Once inserted, the offset applies from the present position (PPOS) all along the flight
plan to the first waypoint (WPT) at which a holding pattern is defined, or to the last waypoint before
the runway. In most cases, the crew will use it en-route, because of an ATC clearance, or to avoid
bad weather expected along the flight plan route.
Accessed from lateral revision (LAT REV) at the present position page, an offset may be defined
between 1 and 50 nm in one-nautical-mile steps.
After inserting the offset in the flight plan, the flight plan page shows OFST in its title, and the
navigation display shows the offset flight plan in a solid green line and the original flight plan in a
dashed green line.
The offset is cleared :
Automatically (holding pattern, approach), or‐
Manually with the clear (CLR) key.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - LATERAL FUNCTIONS
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FCOM 19 AUG 10
Note: If the crew enters an OFFSET when the aircraft is too close to the ending offset
waypoint, the FMGS may refuse to accept it, in which case the MCDU displays the
“ENTRY OUT OF RANGE” message.
INSERTING AN OFFSET
SELECT LAT REV at the present position (PPOS)
WRITE the required offset value and direction (for example, L5 or 5L).
PRESS [2L] to enter the offset into the OFFSET field.
PRESS [6R] to activate the OFFSET.
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 27/44
FCOM 19 AUG 10
MANUAL CANCELLATION OF OFFSET
There are two standard methods of cancelling an offset :
1. SELECT DIR TO a waypoint (the next waypoint, for example)
2. SELECT a Lateral Revision (LAT REV) at FROM WPT
CLEAR the OFFSET field.
PRESS [6R] to activate the temporary flight plan (cancelling OFFSET).
ALTERNATE FUNCTION
Applicable to: ,
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.‐
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.
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 28/44
FCOM 19 AUG 10
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 to change the preferred alternate, if necessary.
Access the ALTERNATE page through the ALTN prompt on LAT REV page at destination. The
alternate airfields are attached to the destination.
ENTERING NEW ALTERNATE INTO THE F-PLN
If the preferred alternate is not suitable, proceed as follows :
SELECT F-PLN key on MCDU
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 for flight to another alternate airfield may be obtained by selecting
the OTHER ALTN field.
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 29/44
FCOM 19 AUG 10
SELECT LAT REV at DESTINATION.
SELECT ALTN [5L] key.
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 into the brackets (if required). XTRA fuel and track (TRK) will appear.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(79)
