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exists in 4L field.
This prompt is not displayed on the destination VERT REV page.
(Refer to DSC-22_20-30-20-25-C ENTERING A CONSTANT MACH
SEGMENT).
[ 5R ] STEP ALTS
(white)
This legend appears for any waypoint, once a cruise altitude has
been entered. It is not available in engine-out, descent, approach,
and go-around phases.
This gives the pilot access to the STEP ALTS page.
[ 6R ] DES When this field displays “DES”, pressing this key assigns the
constraints to the descent phase and inserts them into the vertical
flight plan. The page reverts to the F-PLN page. (See note below ).
Note: Altitude and speed constraints may apply to the climb, descent, or approach phase, but
never to the cruise phase. Fields 6L/6R display “CLB/DES” when the revised waypoint is a
cruise phase waypoint and the FMGS needs to know if the new constraint is to be applied
in climb or descent phase. The FMGS will modify the cruise phase accordingly. These 2
prompts also display “CLB/DES” when the predictions are not computed. (Top of climb and
top of descent not yet defined).
STEP ALTS PAGE
Applicable to:
This page allows the pilot to insert up to four geographic step points and one optimal step point into
the flight plan. This page also displays the cost savings associated with the optional step.
The pilot calls it up either from the vertical revision page, or from the performance cruise page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_20-50-10-25 P 39/104
FCOM 19 AUG 10
TITLE STEP ALTS followed by the current cruise altitude
Line 1 In this field, the pilot can enter either a geographic step or an altitude for an optimal step.
Line 2 to line 4 STEP AT (large blue font)
The pilot can only enter geographic steps in these fields.
Displays the point at which the active step begins. It may either be an active (or secondary)
flight plan waypoint, or an inserted optimal point (OPT).
DIST / TIME (UTC)
(small green font)
Displays the distance to go, and time from the present aircraft position along the flight plan
to the step point.
ALT Displays the altitude to step to, and allows entry of the optimal step format : FL or ALT.
Note: The following messages may be displayed in the DIST / TIME field :
ABOVE MAX, if the step altitude exceeds ‐ the Max altitude.
‐ 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.
‐ NO OPTIMAL, if an inserted optimal step falls in a discontinuity due to a
flight plan change, or if a time constraint exists in the flight plan.
[ 5L ] TO OPT PT
(green small font)
This field displays the distance and time to an uninserted optimal step point, if one exists.
[ 6L ] RETURN The flight crew presses this key to return to the previous page.
Note: On any flight plan change, an inserted optimal step remains in the flight plan at
a fixed distance to destination.
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
CONTROLS AND INDICATORS - MCDU - PAGE DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_20-50-10-25 P 40/104
FCOM 19 AUG 10
Continued from previous page
[ 5R ] SAVINGS This field displays the fuel and time savings prior to the insertion of the optimal step point.
Fuel savings are displayed in thousand of kilograms (or pounds) (maxi 99.9). The value is
preceded by :
“–” in case of fuel saving,
“+” in case of additional fuel cost.
Time savings are displayed in hours and minutes. The value is preceded by :
“–” in case of time saving,
“+” in case of additional time cost.
Note: If no optimal step point exists for the altitude displayed in [ 1R ], the “NO
OPTIMAL” message is displayed in the FUEL / TIME field. This message is
also displayed, if the optimal step falls into a discontinuity.
[ 6R ] INSERT
(amber) This field displays INSERT, when an optimal step point exists but is not yet inserted. When
INSERT is selected :
The optimal step point is inserted ‐ into the flight plan.
‐ OPT is displayed in line 1L.
‐ Optimal step distance and time are deleted in line 5L.
‐ The * UPDATE blue prompt replaces the INSERT prompt.
UPDATE This prompt enables the computation of another optimal step point.
The UPDATE prompt is then replaced by the *INSERT prompt.
RTA PAGE
Applicable to:
　
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