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• The S/C (S/D) is sequenced without any level change done by the crew.
• The crew achieves a LAT REV, which deletes the associated waypoint from the F-PLN
• By EO condition.
‐ A STEP is manually cleared :
• On the STEP ALTS page, by CLEARING the corresponding field.
• On the F-PLN page, by CLEARING the (S/C) or (S/D) pseudo-waypoints.
‐ A STEP entry is IGNORED, if the remaining CRZ distance is less than about 50 nm.
‐ Once the steps are inserted in the F-PLN, they are displayed :
‐ On the MCDU, as (S/C), (S/D), (T/C), (T/D) pseudo waypoints.
‐ On the ND, by associated , , , white symbols.
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 8/12
FCOM 19 AUG 10
OPTIMUM STEP
Once geographic steps are inserted or an altitude is entered, the FM proposes an OPTIMUM
STEP start of climb position for the first step climb altitude ahead : Fuel/time savings are
displayed, if above 100 kg/min. If no savings are found, no optimum step is proposed.
The OPT STEP is not automatically inserted. The crew must insert it, if appropriate. Once
inserted, the OPT STEP point (OPT) becomes a fixed geographical point.
If some F-PLN parameters are subsequently changed (e.g. winds, new waypoints), an update
of the optimum position relative to the previous one may be proposed. If savings exist, this new
optimum may be inserted to replace the previous optimum step point.
Once an OPT STEP is inserted in the F-PLN, and the crew achieves a lateral F-PLN revision,
the FM keeps the (OPT) along the new F-PLN, at the same distance from the aircraft’s position,
as previously determined.
Rules
The OPT STEP is only computed by the FM, if data required ‐ for the prediction computation
are inserted : F-PLN, CRZ FL, CI, GW, CG at least.
‐ The search of the OPT STEP begins 20 nm beyond (T/C) before Cruise, or ahead of the
aircraft’s position.
‐ The search of the OPT STEP ends 20 nm before the next STEP POINT, or 300 nm before
the (T/D).
‐ Only one OPT STEP is computed at a time.
Guidance
When reaching the step point, the steps must be initiated by the crew by selecting the new
CRZ FL, and pressing the FCU ALT selector knob. If sequenced without any crew action, the
step is automatically deleted.
If the crew initiates the step :
‐ The CRZ FL is automatically reassigned to its new value.
‐ The guidance is THR CLB/CLB for a step climb.
THR IDLE/DES with V/S = -1 000 ft/min for a 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 9/12
FCOM 19 AUG 10
STEP ENTRY
The STEP ALTS page is either accessed from
the
: ‐ The VERT REV page, or
‐ 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 ALT/WPT in the scratchpad, and ENTER it in [1L] to [4L].
Note: ‐ The position may be a waypoint ident, PBD, PD.
‐ The pilot may enter LMG/–20/350. The FMS will compute the geographic step to
FL 350 20 nm before LMG.
‐ To modify an inserted STEP :
• To modify the CRZ FL only, enter it in the left key, as “FLXXX”.
• To modify the position only, enter it in the left key, as “/XXX”.
• 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 10/12
FCOM 19 AUG 10
FOR OPTIMAL STEP
Once the geographic steps are inserted, and the predictions are available, the FMGS computes
an optimal location for the first step, and the STEP ALTS page displays the associated
FUEL/TIME savings.
Note: If the FMGS cannot determine an optimal step for the selected altitude, “NO OPTIMAL
STEP” is displayed in the [5L] field.
To INSERT the proposed OPT STEP :
SELECT the [5L] 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 11/12
FCOM 19 AUG 10
The computed (OPT) step replaces the initially inserted step position. Once inserted, the time
and fuel savings associated to the optimal step are no longer displayed. The optimum step
　
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