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CHECK XTRA FUEL.
MONITORING THE FUEL PREDICTIONS
Applicable to:
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The F-PLN and FUEL PRED pages display fuel and time predictions throughout the flight. These
predictions are meaningful if the lateral and vertical flight plan, and the entered winds are accurate
enough.
PROCEDURE
In addition to the Fuel Management procedure described in the SOPs (Refer to STLO-SOP-15-A
CRUISE - FLIGHT PROGRESS), periodically apply the following actions :
KEEP ACCURATE FMS PREDICTIONS
Periodically UPDATE the F-PLN elements (F-PLN waypoints, step altitudes, predicted winds).
CHECK/MODIFY the MIN DEST FOB value on the FUEL PRED page
At the beginning of the CRZ phase, and/or after any change of destination or alternate airport,
CHECK/MODIFY the MIN DEST FOB value on the FUEL PRED page. Check that the displayed
MIN DEST FOB value corresponds to the required minimum fuel at destination, or enter the
required value in the [ 5R ] field.
CHECK the DEST EFOB value on F-PLN the or FUEL PRED page
MONITOR the EFOB at destination on the F-PLN or FUEL PRED page. If necessary, ADAPT the
flight strategy.
Note: The crew should keep in mind that the MIN DEST FOB function and the FMS-computed
EXTRA fuel are based on different hypothesis :
The EXTRA fuel computation may take into account ‐ the RTE RSV (according to the
AMI configuration)
‐ The EXTRA fuel takes into account the FMS-estimated ALTN fuel (which may be
inaccurate, due to the computation hypothesis, such as wind model, performance...).
As a consequence, the EXTRA fuel predicted by the FMS, as well as the “LAST EXIT”
time/fuel information displayed on the HOLD page, may not be compatible with the MIN
DEST FOB specified by the crew.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 7/26
FCOM 19 AUG 10
”DEST EFOB BELOW MIN” MESSAGE
If the predicted EFOB at destination becomes less than the MIN DEST FOB value displayed on
the FUEL PRED page :
‐ The destination EFOB turns to amber on the F-PLN, FUEL PRED and PERF (CLB, CRZ, DES)
pages,
‐ The “DEST EFOB BELOW MIN” amber message is displayed on the MCDU scratchpad, after
2 min (if the FMS is in CRZ or DES phase).
PROCEDURE
�� If the “DEST EFOB BELOW MIN” message is triggered on the MCDU :
CHECK the DEST EFOB value on the F-PLN or FUEL PRED page,
CHECK the hypothesis used by the FMS to compute the fuel predictions,
Check that the F-PLN elements (F-PLN waypoints, step altitudes, predicted winds) are
up-to-date, to ensure that the FMS predictions are accurate.
CHECK the MIN DEST FOB value on the FUEL PRED page,
ADAPT the flight strategy as required.
ENTERING A STEP CLIMB OR A STEP DESCENT
Applicable to:
The flight crew can use the STEP PREDICTION page to enter one step climb or one step descent at
any waypoint of the cruise phase except the “FROM” waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 8/26
FCOM 19 AUG 10
PROCEDURE
PRESS the F-PLN key.
SELECT “VERT REV” at the waypoint where you want to climb.
WRITE the desired step altitude into the scratchpad and ENTER it.
WRITE a wind (if it is significantly different from the initial cruise-flight-level wind) into the
scratchpad and ENTER it.
INSERT the step.
CHECK the predictions.
The FM uses the step climb or the step descent to recompute the predictions.
The ND shows symbols for the start of climb (S/C) or descent and the top of climb (T/C) or bottom
of descent. The MCDU shows the associated pseudo-waypoints.
The step automatically revises the cruise flight level.
The flight crew must initiate the climb )or the descent by pulling out or pushing the altitude selector
knob. CLB or OP CLB will engage in climb, DES or OP DES in descent.
DES mode engages with a constant vertical speed of -1 000 ft/min.
If the aircraft passes the step waypoint without beginning a climb or a descent, the system deletes
the step from the vertical F-PLN automatically (“STEP DELETED” appears) and recomputes the
predictions.
The system will not accept a step climb or descent if it does not ensure at least one minute of flight
time at the new altitude.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 9/26
　
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