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the aircraft is less than 7 nm from it, and also when the difference between the track of
the aircraft and the track of the leg is less than 90 °. The same conditions apply in NAV
mode, except that no distance to the waypoint is taken into account.
The FMGS automatically strings additional types of legs, when departure or arrival procedures (SID -
STAR - TRANS) are defined.
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_20-30-10-05 P 6/24
FCOM 19 AUG 10
Those strings correspond to specific patterns that are heading or track referenced and are defined in
the database, such as:
‐ DME arc leg
‐ Holding pattern to a fix, or reverse turn
‐ Course-to-fix leg
‐ Radius-to-fix leg
‐ Heading leg
‐ MANUAL leg.
The flight crew cannot create these types of legs: They are part of the stored departure/arrival
procedures they have selected.
The flight crew can only create direct legs between manually defined geographic points (navaids,
airports, waypoints).
Note: The departure and arrival procedures are defined in the database to minimize the amount
of memory required.
They are divided, as follows:
‐ DEPARTURE = SID + EN ROUTE TRANSITION
‐ ARRIVAL = APPR VIA + STAR + EN ROUTE TRANSITION
The SID is the central common part of the departure procedure, as the STAR is of the
arrival procedure. Enroute transitions (TRANS) are the various possible trajectories defined
between the last SID point and the first enroute waypoints, and between the last enroute
waypoint and the first fix of the STAR . ”APPR VIAs” are the possible trajectories, defined
between the last STAR point and the first point of the approach.
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_20-30-10-05 P 7/24
FCOM 19 AUG 10
GENERAL
Applicable to:
,
,
MSN,,
4538,,
To insert the lateral flight plan, the flight crew can use either a company route number or an ICAO
four-letter city pair.
The lateral flight plan includes the following elements:
‐ Departure
• Takeoff runway
• SID
• En route transition.
‐ En route
• En route waypoints and airways.
‐ Arrival
• En route transition
• STARs/VIAs
• Landing runway with selected approach
• Missed approach.
‐ Alternate flight plan.
These elements are defined by waypoints and legs between the waypoints.
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_20-30-10-05 P 8/24
FCOM 19 AUG 10
The FMGC automatically strings the legs in sequence.
The flight plan has a discontinuity if any two waypoints do not have a leg defined between them.
The computer assumes that the aircraft will fly a direct leg between the two waypoints that define the
discontinuity.
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_20-30-10-05 P 9/24
FCOM 19 AUG 10
Note: 1. When the aircraft overflies a flight plan discontinuity, the NAV mode automatically reverts
to the HDG (TRK) mode.
2. In HDG/TRK mode, a waypoint is sequenced when it passes behind the aircraft, and the
aircraft is less than 5 nm from it. In addition, when the waypoint is the Destination Airport
(DEST), the sequencing is inhibited, unless the following conditions are fulfilled within the
3 s following the general rules fulfilment:
‐ The cross-track is less than 0.5 nm
‐ The difference between the track of the aircraft and the track of the leg is less than
30 °.
The same conditions apply in NAV mode, except that no distance to the waypoint is
taken into account.
The FMGS automatically strings additional types of legs, when departure or arrival procedures (SID -
STAR - TRANS) are defined.
Those strings correspond to specific patterns that are heading or track referenced and are defined in
the database, such as:
‐ DME arc leg
‐ Holding pattern to a fix, or reverse turn
‐ Course-to-fix leg
‐ Radius-to-fix leg
‐ Heading leg
‐ MANUAL leg.
The flight crew cannot create these types of legs: They are part of the stored departure/arrival
procedures they have selected.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(71)
