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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-05 P 9/12
FCOM 19 AUG 10
VERTICAL CONSTRAINTS (SPEED, ALTITUDE, TIME)
Applicable to:
The flight crew enters speed, altitude and time constraint �� , either to comply with ATC requests
and specified procedures, or at the discretion of the flight crew, in response to operational variables.
SPEED LIMIT
A speed limit is associated with altitude as a maximum speed below a specified altitude (only one
in climb and one in descent).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-05 P 10/12
FCOM 19 AUG 10
ALTITUDE CONSTRAINT
Altitude constraints may be attached to specific waypoints in the climb, descent, or approach
phases.
To meet the altitude constraint, the aircraft must fly over the waypoint at an altitude equal, above
or below the altitude constraint as specified by the flight crew or the database.
An altitude constraint is considered as missed if the system predicts more than 250 ft of difference
between the constraint value and the predicted aircraft altitude.
Altitude constraints are observed in CLB or DES or APP NAV-FINAL modes.
Note: The database may contain an altitude constraint window (two altitudes between which
the aircraft must fly passing over a given waypoint), but the flight crew cannot enter such
a constraint manually.
SPEED CONSTRAINT
Speed constraints may be attached to specific waypoints in the climb, descent or approach
phases. To meet the speed constraint, the aircraft must fly over the waypoint with a speed equal or
less than the speed constraint.
A speed constraint is considered as missed if the system predicts an aircraft speed 10 kt greater
than the speed constraint.
Speed constraints are observed when NAV mode is engaged and speed target is managed.
Otherwise speed constraints are disregarded.
TIME CONSTRAINT
Time constraint �� may be attached to any waypoint except the "from" waypoint.
Note: No constraint can be associated with go-around waypoints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-05 P 11/12
FCOM 19 AUG 10
VERTICAL CONSTRAINTS (SPEED, ALTITUDE, TIME)
Applicable to:
,
,
MSN,,,,
The flight crew enters speed, altitude and time constraint, either to comply with ATC requests and
specified procedures, or at the discretion of the flight crew, in response to operational variables.
SPEED LIMIT
A speed limit is associated with altitude as a maximum speed below a specified altitude (only one
in climb and one in descent).
ALTITUDE CONSTRAINT
Altitude constraints may be attached to specific waypoints in the climb, descent, or approach
phases.
To meet the altitude constraint, the aircraft must fly over the waypoint at an altitude equal, above
or below the altitude constraint as specified by the flight crew or the database.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
FLIGHT PLANNING - VERTICAL FUNCTIONS
A318/A319/A320/A321 FLEET DSC-22_20-30-20-05 P 12/12
FCOM 19 AUG 10
An altitude constraint is considered as missed if the system predicts more than 250 ft of difference
between the constraint value and the predicted aircraft altitude.
Altitude constraints are observed in CLB or DES or APP NAV-FINAL modes.
Note: The database may contain an altitude constraint window (two altitudes between which
the aircraft must fly passing over a given waypoint), but the flight crew cannot enter such
a constraint manually.
SPEED CONSTRAINT
Speed constraints may be attached to specific waypoints in the climb, descent or approach
phases. To meet the speed constraint, the aircraft must fly over the waypoint with a speed equal or
less than the speed constraint.
A speed constraint is considered as missed if the system predicts an aircraft speed 10 kt greater
than the speed constraint.
Speed constraints are observed when NAV mode is engaged and speed target is managed.
Otherwise speed constraints are disregarded.
TIME CONSTRAINT
Time constraint may be attached to any waypoint except the "from" waypoint.
Note: No constraint can be associated with go-around waypoints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
　
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