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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 Refer to STLO-22_20_R-20-20
NAVIGATION ACCURACY CHECK.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 2/14
FCOM 19 AUG 10
A quick check is explained here below when the TO waypoint is a DME type. (VOR/DME or DME
or VOR/TAC or TAC).
If the MCDU or the ECAM displays one of the following messages :
IRS ONLY NAVIGATION (10 min IRS nav mode, en route) on the MCDU
FMS 1/2 POS DIFF (5 nm pos difference between FMs) on the MCDU
GPS PRIMARY LOST (FM-IRS threshold function of Δt) on the ECAM
CHECK IRS X/FM POS (FM-IRS threshold function of Δt) on the ECAM
FM/IRS POS DISAGREE (FM-IRS threshold function of Δt) on the ECAM
FM/GPS DISAGREE (> 0.5 nm )
NAV ACCUR DOWNGRAD (EPE > required RNP)
or, if there is a discrepancy between the raw data position and the FM position :
PRESS the [DATA] key on MCDU.
SELECT “FREEZE”.
SELECT the POSITION MONITOR page.
On the other MCDU : Select the GPS MONITOR page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 3/14
FCOM 19 AUG 10
MONITORING THE PREDICTIONS
Applicable to: ALL
The F-PLN page 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 ft)
‐ Decrease the cost index down to zero if necessary (MIN FUEL). If the extra fuel is positive,
set CI = LRC.
‐ 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
NORMAL PROCEDURES
SYSTEMS RELATED PROCEDURES - FMS
A330/A340 FLEET PRO-NOR-SRP-01-50 P 4/14
FCOM 19 AUG 10
�� When an alternate is not necessary, you may select “NO ALTN” option :
‐ CHECK the required conditions (weather, runways, etc.) for NO ALTN.
‐ SELECT “NO ALTN” on the ALTN selection page.
‐ ADJUST FINAL TIME on the FUEL PRED page.
‐ CHECK XTRA FUEL.
The pilot must ensure that the aircraft flies the cruise flight level entered on the PROG
page. Then, the aircraft will :
‐ Fly at ECON CRZ MACH.
‐ Benefit from the A/THR SOFT mode.
‐ Present accurate predictions.
This is displayed on the Flight Mode Annunciator (FMA) :
ENTERING A STEP CLIMB OR A STEP DESCENT
Applicable to: ALL
The crew may use the STEP ALTS page to enter up to four geographic step points or one optimal
step (computed by the FMGS) at any waypoint of the cruise.
PROCEDURE
PRESS the PERF key.
SELECT the “STEP ALTS” prompt.
The PERF PAGE displays this prompt in cruise phase. The crew may also call up the STEP ALTS
page using a vertical revision at any cruise waypoint.
ENTERING AN OPTIMAL STEP (ONLY STEP CLIMBS)
　
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