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position is regularly updated until the aircraft is within 20 nm of the optimum step point.
Note: If the circumstances lead to a situation where the entered optimal step is no longer
optimal, “NO OPTIMAL” is displayed in the [1R] field.
TO DETERMINE THE OPTIMAL STEP LOCATION WHEN 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, ZFWCG and BLOCK fuel are inserted on the INIT B page.
ENTER the new CRZ FL in the STEP ALTS page in the [1L] field.
If an optimal step can be determined, the FMGS automatically computes the optimal position of
the step, with associated fuel/time savings.
CHECK the fuel and time savings and prediction on the [6R] field.
Savings are computed by comparing the entered step altitude, and the origin altitude of the
step.
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 12/12
FCOM 19 AUG 10
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 REC 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 AHEAD”, when the distance to the step point is less than 20 nm. A “STEP AHEAD”
scratchpad message is also displayed.
‐ 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. step climb after step
descent).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - REQUIRED TIME OF ARRIVAL (RTA)
A318/A319/A320/A321 FLEET DSC-22_20-60-120 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to:
A time constraint (RTA) may be assigned at any waypoint of the F-PLN, downpath of the origin and
the FROM waypoint. It can be an ”AT”, “AT OR BEFORE”, or “AT OR AFTER” constraint.
The FMS computes a new managed speed profile from the aircraft position to the constrained
waypoint, in order to match the 30–rdbnmccheedqdmbdΔS(adsvddmsgdshldoqdchbsdcssgd
constrained waypoint and the RTA. This modified managed speed profile can be checked using the
speed prediction, displayed for each waypoint of the F-PLN page.
The RTA function uses a speed range between Green Dot speed and VMO - 10 (or MMO - 0.02).
When the constrained waypoint is sequenced, the ECON SPD/MACH is resumed unless the
constrained waypoint is located in a descent segment.
Note: The FM does not compute a new managed speed profile when a RTA is entered in the
descent profile while the aircraft is in cruise within 40 nm from the top of descent.
The time constraint is inserted on the RTA page. A time constraint may be inserted at any waypoint
of the primary or secondary flight plan.
If an engine-out condition is detected, the time constraint is automatically deleted and RTA
DELETED message on scratchpad.
If the aircraft enters a holding pattern, the downpath time constraint is deleted.
Once inserted in the F-PLN, the RTA is displayed in magenta on the F-PLN page, as long as no
predictions are available.
Once the predictions are available, the time constraint is replaced by the new predicted time at the
associated waypoint,and highlighted by a star : (*)
The (*) is magenta, if the ‐ time constraint is matched with the 30–second criteria.
‐ The (*) is amber, if the time constraint is missed.
Time constraint matching criteria :
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RTA.
TIME CSTR ENTRY
PRESS the F-PLN key.
SELECT vertical revision at the revised waypoint.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 2(63)