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Procedure
PRESS the F-PLN key on the MCDU.
SELECT VERT REV at the FROM waypoint.
WRITE a new speed limit/altitude.
CHECK and INSERT the temporary flight plan.
The crew can insert one climb speed limit and one descent speed limit into the vertical flight
plan, or modify or clear the limits that are already in it.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-10 P 25/58
FCOM 19 AUG 10
The speed limit is defined by a speed and an altitude (for example, 230/9 000), which means
that the managed speed target will be limited by the speed limit when the aircraft flies below
the specified altitude.
Inboth climbanddescent,250 kt at 10,000 ft is the default speed limit in the vertical flight plan.
The vertical revision page presents the climb speed (CLB SPD) limit if the revised waypoint is
between departure and top of descent.
The vertical revision page shows the descent speed (DES SPD) limit, if the revised waypoint
is between top of descent and destination.
It can be deleted by a clear action, the field reverts to brackets. It can also be cleared directly
on the F-PLN A page by clearing the SPD LIM pseudo-waypoint.
ENTERING A SPEED CONSTRAINT
Procedure
PRESS the F-PLN key on the MCDU.
SELECT the VERT REV page at the revised waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-10 P 26/58
FCOM 19 AUG 10
ENTER the speed constraint value in the [ 3L ] field.
CHECK and INSERT the temporary flight plan.
When predictions are not yet available, the constraints are displayed on the F-PLN A page in
magenta.
When predictions are available, the speed constraint is highlighted by a star (*).
* If the predicted speed matches the constraint, the star is magenta.
* If the prediction is that the aircraft will miss the speed constraint, the star is amber.
If a speed constraint cannot be met (by more than 10 kt), the FMGS generates the
message “SPD ERROR AT WPT XX”.
A speed constraint may be assigned to any waypoint in the climb or the descent phase
except the FROM, origin, or destination waypoints, and any pseudo waypoint.
When a speed constraint is assigned to a waypoint, the constraint will limit the managed
speed target as follows :
In takeoff or climb phase until you pass ‐ the constrained waypoint.
‐ In descent an approach phase, after passing the constrained waypoint.
Speed constraints are observed by the FMGS when NAV mode and speed managed are
active.
ENTERING A SPEED CONSTRAINT THROUGH F-PLN A PAGE
You may also enter a speed constraint through the F-PLN A page.
Note: You may delete the constraint using the clear key on the relevant right hand key.
However if there is an altitude constraint assigned at that point, the clear action deletes
it too.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-10 P 27/58
FCOM 19 AUG 10
ENTERING AN ALTITUDE CONSTRAINT
Procedure
PRESS the F-PLN key on the MCDU.
SELECT the “VERT REV” page at the revised waypoint.
WRITE an altitude constraint in the scratchpad and ENTER it in 3R.
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Sgd􀀃rxrsdl􀀃chrok􀁄xr􀀃sgd􀀃←􀀃B􀀯A􀀃nq􀀃CDR􀀃→􀀃oqnlos+􀀃vgdm􀀃sgd􀀃oqdchbshnmr􀀃􀁄qd􀀃mns􀀃xds􀀃􀁄u􀁄hk􀁄akd+
or when the waypoint is part of the cruise phase as originally defined.
CHECK and INSERT the temporary flight plan.
Note: In case of QFE operations, the altitude constraints must be converted and entered
as an altitude in feet.
You or the database may assign an altitude constraint to any waypoint in the climb or descent
phases except the FROM, origin, or destination waypoints, or any pseudo waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-10 P 28/58
FCOM 19 AUG 10
An altitude constraint may be defined as an “at”, an “at or above”, or an “at or below”
　
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