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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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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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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)
The estimated takeoff time (ETT) is a time entered during preflight at the origin airport. The
computer then uses this time as the start time for predictions. The system accepts it during the
preflight phase if the ETT is later than the time at which you enter it.
Procedure
PRESS the F-PLN key
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
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SELECT the VERT REV page at departure.
WRITE the estimated takeoff time into the scratchpad and ENTER it in 2R.
The display reverts automatically to F-PLN A page.
If the aircraft has not taken off by the time entered as the 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.
Applicable to: ALL
FLIGHT PLAN CHECK
CHECK the EOSID on the ND plan mode (yellow line).
Note: If the details of the EOSID require review, select the EOSID as a TMPY F-PLN and
review it as TMPY. Then ERASE it.
Applicable to: ALL
SECONDARY F-PLN
For details : Refer to DSC-22_20-60-60 SECONDARY FLIGHT PLAN.
Applicable to: ALL
RADIO NAV
Whenever a navaid ident is correctly decoded, in agreement with that published, no audio check is
necessary.
Morse decoding is displayed on the ND for VOR/DME, VOR/TAC, DME, ADF, and on the PFD for
ILS.
Preferably use the identifier for navaid entry.
If the ADF ident is not in the database, be sure to include a decimal point when tuning the
frequency (e.g 315. or 325.7).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
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Note: Whenever, the runway ILS is intented to be retained for guidance after the takeoff phase,
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