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FCOM 19 AUG 10
If no step wind is entered, the wind used at the new CRZ FL is automatically defaulted to the wind
at the previous flight level.
ENTERING A STEP CLIMB OR A STEP DESCENT
Applicable to:
The crew may use the STEP ALTS page to enter up to four geographic step points or one optimal
step (computed by the FMGS) at any waypoint of the cruise.
PROCEDURE
PRESS the PERF key.
SELECT “STEP ALTS” prompt.
The PERF PAGE displays this prompt in cruise phase. The crew may also call up the STEP ALTS
page using a vertical revision at any cruise waypoint.
ENTERING AN OPTIMAL STEP (ONLY STEP CLIMB)
WRITE the desired step altitude or FL into the scratchpad.
ENTER the step altitude or FL in the [1R] field.
CHECK the FUEL and TIME SAVINGS predictions on the 5L and 5R fields.
PUSH the INSERT prompt [6R] if adequate.
After insertion, the optimum step location is updated only when the flight crew presses the
UPDATE prompt [6R].
The ND shows symbols for the start of climb (S/C) and the top of climb (T/C). The MCDU shows
the associated pseudo-waypoints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 10/26
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 the FCU knob
ENTERING A GEOGRAPHIC STEP (STEP CLIMB OR STEP DESCENT)
WRITE a step altitude into the scratchpad.
The format is position/altitude (or FL). The position can be a waypoint or waypoint/distance to
waypoint. The waypoint/distance is an along track offset waypoint.
ENTER it in [1L] to [4L] field.
The entry of the initial geographic step point requires both a valid waypoint and altitude entries.
When a step has been entered, the flight crew may change the position and the altitude
independently. The flight crew cannot modify the position and the altitude in a single entry : To
modify both, they should modify the position first, and then the altitude.
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 11/26
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 start step 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 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.
ENTERING A STEP CLIMB OR A STEP DESCENT
Applicable to:
,
,
MSN,,
4538,,
The crew may use the STEP ALTS page to enter up to four geographic step points or one optimal
step (computed by the FMGS) at any waypoint of the cruise.
PROCEDURE
PRESS the PERF key.
SELECT “STEP ALTS” prompt.
The PERF PAGE displays this prompt in cruise phase. The crew may also call up the STEP ALTS
page using a vertical revision at any cruise waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 12/26
FCOM 19 AUG 10
ENTERING AN OPTIMAL STEP (ONLY STEP CLIMB)
WRITE the desired step altitude into the scratchpad.
ENTER it in the [1L] field
The FMGS automatically computes the optimal location of the step and inserts it in the TMPY
F-PLN.
CHECK the FUEL and TIME SAVINGS predictions on the [ 6R ].
After insertion, the optimum step location is regularly updated, until the aircraft is within 20 nm of
the step point.
The ND shows symbols for the start of climb (S/C) and the top of climb (T/C). The MCDU shows
　
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