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‐ PERF CRZ page.
FOR GEOGRAPHIC STEP :
PRESS the PERF key, or PRESS the F-PLN key and SELECT VERT REV at a cruise waypoint.
SELECT the STEP ALTS prompt.
WRITE the POSITION/NEW CRZ FL in the scratchpad, and ENTER it in [1L] to [4L].
Note: ‐ The position may be a waypoint ident, PBD, PD.
‐ The crew may enter LMG/–20/350. The FMS will compute the geographic step
20 nm before LMG to FL 350.
‐ To modify an inserted STEP :
• To modify the CRZ FL only, enter it in the right key.
• To modify the position only, enter it in the left key.
• To modify both, modify the position first, and then the CRZ FL (it is not possible to
modify both in a single entry).
CHECK the PREDICTIONS.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - STEP ALTS
A318/A319/A320/A321 FLEET DSC-22_20-60-110 P 4/12
FCOM 19 AUG 10
FOR OPTIMAL STEP
Once all geographical steps are inserted, and the predictions are available, the STEP ALTS
page displays the FUEL/TIME savings for the first step climb. If no significant savings are
predicted, the NO OPTIMAL message is displayed.
To INSERT the proposed OPT STEP :
SELECT the INSERT prompt.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - STEP ALTS
A318/A319/A320/A321 FLEET DSC-22_20-60-110 P 5/12
FCOM 19 AUG 10
The computed (OPT) step replaces the initially inserted step position, and is then considered at
a fixed geographic position. Savings are no longer displayed, and the UPDATE prompt replaces
the INSERT prompt. This prompt allows the crew to update the (OPT) step position, considering
possible F-PLN or inserted wind changes.
If pressed, a new OPT point is proposed, with the associated SAVINGS and INSERT prompt, or
NO OPTIMAL.
UPDATE prompt has been pressed, the new OPT STEP point gives additional savings :
THERE ARE ONLY 2 CRZ FLS IN THE F-PLN :
The crew may obtain the optimal position for the STEP as follows :
INSERT the initial CRZ FL on the INIT A page.
ENSURE that the ZFW and BLOCK fuel are inserted on the INIT B page.
ENTER the new CRZ FL in the STEP ALTS page in the [1R] field.
Distance and time to optimum point and fuel/time saving are displayed.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - STEP ALTS
A318/A319/A320/A321 FLEET DSC-22_20-60-110 P 6/12
FCOM 19 AUG 10
CHECK the fuel and time savings and prediction on the [5L] and [5R] fields.
Savings are computed by comparing the entered step altitude, and the origin altitude of the
step.
INSERT, if suitable.
Note: No OPT STEP can be computed in the SEC F-PLN.
MESSAGES
Messages may be displayed in the DIST/TIME field :
“ABOVE MAX”, if the inserted ‐ step altitude exceeds the MAX MAX ALT.
The “STEP ABOVE MAX FL” scratchpad message is associated to the “ABOVE MAX”
message.
‐ “IGNORED” displayed in the following cases :
• Step climb is located prior to the top of climb, or after the top of descent.
• Step end is at less than 50 nm from the top of descent. An optimum step point, < 200 nm
from top of descent, cannot be inserted.
‐ “STEP NOW”, when the distance to the step point is less than 20 nm.
The following message may be displayed in the scratchpad :
‐ A “NOT ALLOWED” message is displayed in the scratchpad, if :
• Four steps already exist in the F-PLN, and an additional step is entered.
• A step is entered at the FROM waypoint, or at a pseudo-waypoint.
• Two consecutive steps are entered at the same waypoint (e.g. st ep climb after step
descent).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - STEP ALTS
A318/A319/A320/A321 FLEET DSC-22_20-60-110 P 7/12
FCOM 19 AUG 10
STEP CLIMB/STEP DESCENT
Applicable to:
,
,
MSN,,
4538,,
The STEP ALTS function enables to define the successive cruise Flight Levels. The optimum
position to initiate a climb, from the initial (or current) cruise Flight Level to the next one, can also be
determined.
PRINCIPLE
GEOGRAPHIC STEPS
Up to four geographic steps may be defined on the STEP ALTS page. These steps are initiated
at the geographical position, along the F-PLN.
Rules
‐ The minimum step size is 500 ft.
‐ A Step Climb (S/C) cannot follow a Step Descent (S/D).
‐ A STEP is automatically cleared, if :
　
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