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A318/A319/A320/A321 FLEET PRO-NOR-SRP-01-50 P 2/26
FCOM 19 AUG 10
MONITORING THE NAVIGATION ACCURACY
Applicable to: ALL
GENERAL
On aircraft equipped with GPS PRIMARY, the navigation accuracy check is not required as long
as GPS PRIMARY �� is available.
Otherwise, navigation accuracy shall be checked periodically in cruise.
The PROG page displays an estimated accuracy as being high or low (center of sixth line). “HIGH”
means that the FMGS estimates the FM position accurate enough to meet the EN ROUTE criteria.
“LOW” means that the pilot must compare raw data from tuned navaids with corresponding data
computed by FM and shown on the ND or MCDU PROG page. The appearance of the message
“NAV ACCUR DOWNGRAD” on the MCDU calls for a similar crosscheck.
Note: The pilot should make such a comparison periodically, even if the PROG page is
displaying “HIGH” and navaids are available : this allows him to quantify the FM position
error.
The method for checking the accuracy is explained in the SOP and in Evaluation of position
accuracy chapter (Refer to STLO-22_20_R-20-20 EVALUATION OF POSITION ACCURACY).
A quick check is explained here below when the TO waypoint is a DME type. (VOR/DME or
VOR/TAC or DME or TAC)
Applicable to:
POSITION DISCREPANCY
�� If there is a discrepancy between the raw data position and the FM position :
PRESS the DATA key on the MCDU.
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 3/26
FCOM 19 AUG 10
SELECT the POSITION MONITOR page.
SELECT “FREEZE”.
The “POSITION MONITOR” page enables the flight crew to analyze the discrepancy.
Applicable to:
POSITION DISCREPANCY
�� If there is a discrepancy between the raw data position and the FM position :
PRESS the DATA key on the MCDU.
SELECT the POSITION MONITOR page.
SELECT “FREEZE”.
On the other MCDU : Select the GPS MONITOR page.
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 4/26
FCOM 19 AUG 10
Applicable to:
,
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MSN,,
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POSITION DISCREPANCY
�� If there is a discrepancy between the raw data position and the FM position :
PRESS the DATA key on the MCDU.
SELECT the POSITION MONITOR page.
SELECT “FREEZE”.
On the other MCDU : Select the GPS MONITOR page.
Applicable to:
POSITION DISCREPANCY
�� If there is a discrepancy between the raw data position and the FM position :
PRESS the DATA key on the MCDU.
SELECT the POSITION MONITOR page.
SELECT “FREEZE”.
On the other MCDU : Select the GPS MONITOR page.
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 5/26
FCOM 19 AUG 10
MONITORING THE PREDICTIONS
Applicable to:
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
UPDATE the F-PLN to show accurate predictions.
Periodically CHECK the wind on the F-PLN B page, and update it when the current wind is
significantly different.
Monitor the fuel by checking :
• Estimated fuel on board (EFOB) at destination (F-PLN page)
• EFOB at alternate and extra fuel (FUEL PRED page)
�� If the extra fuel is negative, modify successively the following data until the extra fuel
becomes null or positive :
CHECK current cruise flight level versus the optimum level (OPT FL)
If advisable, REQUEST reassignment to the OPT FL (or OPT FL +2 000)
Decrease the cost index down to zero if necessary (MIN FUEL)
SELECT another ALTN on the ALTN page and CHECK whether or not XTRA FUEL becomes
positive.
Continue to check different alternates until you find one for which XTRA FUEL is null or
positive.
�� When an alternate is not necessary, you may select “NO ALTN” option :
CHECK the required conditions (weather, runways, etc.) for NO ALTN.
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 6/26
FCOM 19 AUG 10
SELECT “NO ALTN” on the ALTN selection page.
ADJUST FINAL TIME on the FUEL PRED page.
　
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