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descent phases except the FROM, origin, or destination waypoints, or any pseudo waypoint.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-10 P 13/36
FCOM 19 AUG 10
An altitude constraint may be defined as an “at”, an “at or above”, or an “at or below”
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).
Use four digits 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.
Entering an altitude constraint altitude F-PLN A page
The pilot may also enter an altitude constraint directly through the F-PLN A page.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-10 P 14/36
FCOM 19 AUG 10
Use the CLR key 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.
The vertical revision page displays “ALT ERROR”, value along with the difference between
the constraint and the predicted altitude at the revised waypoint.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-10 P 15/36
FCOM 19 AUG 10
The aircraft should be at or below FL 120 at AGN and above FL 180 at LACOU.
ENTERING AN ESTIMATED TAKEOFF TIME (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
SELECT the VERT REV page at departure
WRITE the estimated takeoff time into the scratchpad and ENTER it in 2R
The display automatically reverts to the F-PLN A page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-10 P 16/36
FCOM 19 AUG 10
If the aircraft has not taken off by the time entered as the estimated takeoff time, the MCDU
displays the “CLK IS TAKEOFF TIME” message, meaning that the system will replace your
estimated takeoff time with the actual time.
When begining 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: ,
VERTICAL FLIGHT PLAN
ENTERING/MODIFYING A SPEED LIMIT
Procedure
PRESS the F-PLN key on the MCDU.
SELECT the VERT REV at the FROM waypoint.
WRITE a new speed limit/altitude and ENTER.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 9(173)
