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constraint. In certain procedures, the database may define an altitude constraint as a window
in which the aircraft should fly.
Enter “AT” constraints with no sign.
Enter “AT or ABOVE” constraints preceded by a + sign (+ FL 130, for example).
Enter “AT or BELOW” constraints preceded by a – sign (- 15 000, for example).
enter four or five-digit number when entering altitude. Include the lead zero (0 500 ft , for
example).
For flight level, enter a two- or three-digit number, with or without the letters “FL”. The lead
zero is optional. (Examples : + FL 120 or + 120 ; - FL 090 or - 90 or - 090)
Enter the altitude value as either altitude or flight level ; the MCDU displays the selected value
as an “ALT” or “FL,” as appropriate for the transition altitude.
The constraint must be higher than the thrust reduction altitude and lower than the cruise
flight level.
Once inserted in the flight plan, the altitude constraint (ALT CSTR) is displayed in magenta as
long as predictions are not available.
When predictions are available, the altitude constraints are replaced by the predicted altitude
at relevant waypoints highlighted by a star.
* If the predicted altitude matches the constraint the star is magenta. If the predicted altitude
is missed (by more than 250 ft), the star is amber.
The vertical revision page displays “ALT ERROR”, along with the difference between the
constraint and the predicted altitude at the revised waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
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FCOM 19 AUG 10
ND display
An altitude-constrained waypoint is marked by a circle ( ) on the navigation display.
This circle is white when the guidance does not take the altitude constraint into account. It is
magenta if the guidance system takes the altitude constraint into account and predicts that it
will be matched.
It is amber if the guidance system takes the altitude constraint into account and predicts that it
will not be matched.
The aircraft should be at or below FL 120 at AGN and above FL 180 at LACOU.
Entering an altitude constraint through F-PLN A page
The pilot may also enter an altitude constraint directly through the F-PLN A page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
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FCOM 19 AUG 10
When entering the value into the scratchpad do not forget the slash e.g. /- 120 or /- FL 120.
If the slash is omitted the value will be considered as a speed constraint if it is within the
range value.
Use CLR to delete them directly from the flight plan page, as well. However, if there is also a
speed constraint assigned at that waypoint, the clear action deletes it too.
ENTERING AN ESTIMATED TIME OF TAKEOFF (ETT)
In preflight phase :
SELECT the SEC F-PLN key on the MCDU.
SELECT a VERT REV at any waypoint.
SELECT the Required Time of Arrival (RTA) prompt (2R).
The MCDU displays the RTA page.
ENTER the Estimated Takeoff Time in the [ 6R ] field.
The format is HHMMSS (entry of seconds is not mandatory).
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 31/58
FCOM 19 AUG 10
If the aircraft has not taken off by the time entered as estimated takeoff time, the MCDU
displays the “CLK IS TAKE OFF TIME” message, meaning that the system will replace your
estimated takeoff time with the actual time.
When beginning the takeoff roll, the system automatically adopts that clock time as the
takeoff time.
If the origin airport is changed, or the clock time is invalid, the system automatically deletes
the estimated takeoff time.
ACCESS the temporary flight plan by pressing [ 6L] key. Revise as necessary.
INSERT the temporary flight plan by pressing [ 6L ] key.
Applicable to:
VERTICAL FLIGHT PLAN
ENTERING/MODIFYING A SPEED LIMIT
Procedure
PRESS the F-PLN key on the MCDU.
SELECT VERT REV at the FROM waypoint.
WRITE a new speed limit/altitude and ENTER.
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 32/58
　
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