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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–rdbnmc􀀃cheedqdmbd􀀃􀀋ΔS(􀀃adsvddm􀀃sgd􀀃shld􀀃oqdchbsdc􀀃􀁄s􀀃sgd
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 :
Mnsd9􀀃ΔS􀀃hr􀀃sgd􀀃shld􀀃cheedqdmbd􀀃adsvddm􀀃sgd􀀃shld􀀃oqdchbsdc􀀃􀁄s􀀃sgd􀀃bnmrsq􀁄hmdc􀀃v􀁄xonhms􀀃􀁄mc􀀃sgd
RTA.
TIME CSTR ENTRY
PRESS the F-PLN key.
SELECT vertical revision at the revised waypoint.
　
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