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WRITE a step altitude, or FL in the scratchpad.
ENTER it in the [1R] field.
CHECK the FUEL and TIME SAVINGS, and predictions on the 5L and 5R fields
INSERT it, if adequate.
After insertion, the optimum step climb is only updated when the pilot presses the UPDATE prompt
[6R].
The ND shows symbols for the start of climb and the top of climb. The MCDU shows associated
pseudo waypoints.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 5/14
FCOM 19 AUG 10
It is possible to convert an optimum step to a geographic step by overwriting the [1L] field (see
geographic step).
When reaching the step climb pseudo-waypoint :
‐ REQUEST climb clearance.
‐ ADJUST the FCU altitude to the STEP ALT, and PUSH.
ENTERING A GEOGRAPHIC STEP (STEP CLIMB OR STEP DESCENT)
WRITE a step altitude into the scratchpad.
The format is :
‐ Place/altitude (or FL)
‐ Place/distance/altitude (or FL)
The place must be along the track.
ENTER it in [1L] to [4L] field.
It is possible to independently modify either the location or the altitude of an existing step
altitude. It is not possible to modify with a single entry both the location and the altitude : An entry
“place/xxx” will be taken by the system as an along track offset of xxx nautical miles.
CHECK the predictions (distance, time).
When reaching the step climb or descent pseudo-waypoint (S/C or S/D) :
REQUEST climb or descent clearance.
ADJUST the FCU altitude to the STEP ALT, and PUSH the FCU knob.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 6/14
FCOM 19 AUG 10
The DIST/TIME field may display the following messages :
ABOVE MAX if the ‐ step altitude exceeds the MAX ALT.
‐ IGNORED if the step end point is less than 50 nm from the top of descent.
‐ STEP NOW when the aircraft is within 20 nm of the step point. If the aircraft overflies the
step pseudo-waypoint without commencing a climb or a descent, the system deletes the
step from the vertical F-PLN automatically (a “STEP DELETED” message is displayed on
the MCDU scratchpad), and recomputes the predictions. The step is not deleted if the FCU
altitude is moved only partially towards the step altitude. The flight phase remains “cruise”
whenever a step is initiated.
Note: For an altitude restriction defined at a waypoint less than 50 nm before the top of
descent and lower than the CRZ FL, it is recommended to enter an altitude constraint
rather than a step.
IMMEDIATE CHANGE OF LEVEL IN CRUISE
Applicable to: ALL
When the pilot changes his flight level without inserting a step :
If the FCU-selected altitude is above the previous CRZ FL, the CRZ FL on the PROG
page changes to the new flight level.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 7/14
FCOM 19 AUG 10
If the FCU-selected altitude is lower than the previous CRZ FL and if the distance to
DEST is more than 200 nm, the CRZ FL on the PROG page changes.
In that case Mach target is managed as follows :
‐ At the start of the descent, the Mach target is the managed Mach number at the initial
cruise flight level.
‐ When the aircraft reaches the new flight level, the Mach target switches either to the
Mach number for the lower CRZ FL, or to the speed for the lower CRZ FL if the aircraft
reaches the crossover altitude. This logic prevents the aircraft from exceeding VMO during
descent.
If the FCU-selected altitude is lower than the previous CRZ FL and the aircraft is
within 200 nm of its destination, the system activates the descent phase . The pilot may
reactivate the cruise phase by entering a new cruise flight level in the PROG PAGE
PREPARATION FOR DESCENT AND APPROACH
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 9(184)
