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or integrity lost), the GPS PRIMARY status is lost and the MCDU and the ND display the "GPS
PRIMARY LOST" message. It is possible to clear the scratchpad message on the MCDU, but not on
the ND. During a non-ILS approach, a triple-click aural warning is also triggered.
CAUTION "HIGH" or "LOW" on the PROG page indicates the FM position accuracy, based
on estimated uncertainty. When GPS PRIMARY mode is lost, the flight crew must
periodically check this position accuracy (although in GPS PRIMARY mode, the
position accuracy is always at HIGH).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A318/A319/A320/A321 FLEET DSC-22_20-20-20 P 8/16
FCOM 19 AUG 10
When the GPS is manually deselected, the "GPS IS DESELECTED" message is displayed on the
MCDU, 80 nm before the T/D or at approach phase transition.
FM/GPS POSITION DISAGREEMENT
Applicable to:
,
,
MSN,,,
When the GPS PRIMARY function is active, and either of the FM positions deviate from the GPS
positions 1 or 2 by more than:
A longitude threshold ‐ that depends on the latitude:
• 0.5' for latitudes below 55°
• 0.9' for latitudes at or above 55°, and below 70°.
‐ A latitude threshold of 0.5', regardless of the latitude,
then, the lower ECAM displays the NAV FM/GPS POS DISAGREE amber caution. The master
caution light comes on and the single chime sounds.
This amber caution is inhibited during the takeoff phase.
Above 70° of latitude, a longitude difference does not trigger the alarm.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A318/A319/A320/A321 FLEET DSC-22_20-20-20 P 9/16
FCOM 19 AUG 10
PREDICTIVE GPS PAGE
Applicable to:
,
,
MSN,,,,
The predictive GPS page is only operative with the Honeywell ADIRS equipment. All fields are blank
with Litton ADIRS equipment.
The predictive GPS function predicts the availability of the GPS within ± 15 min of ETA at
destination, or at any waypoint entered by the flight crew.
Predictions are displayed on the predictive GPS page at time intervals of 5 min (+15 and –15 min of
ETA).
To access this page, press the 5L key of the PROG page. This page also enables the deselection of
up to 4 satellites at a time.
NAVIGATION ACCURACY CHECK
Applicable to:
The flight crew must perform this essential check:
‐ Periodically in cruise
‐ At 10 000 ft in descent.
When entering a terminal/approach area, the flight crew must monitor navigation accuracy only.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A318/A319/A320/A321 FLEET DSC-22_20-20-20 P 10/16
FCOM 19 AUG 10
The procedure is:
‐ While en route, check the HIGH/LOW accuracy information.
• If accuracy is "LOW" (and whenever "NAV ACCUR DOWNGRAD" appears), compare raw data
from the tuned navaids with the corresponding FM computed data on the ND or the MCDU
PROG page
• If accuracy is "HIGH", periodically perform the comparison (about once per hour).
‐ In descent, and in terminal and approach areas, validate the estimated accuracy, whether it
is "HIGH" or "LOW", by comparing the FM data with the raw data from the VOR/DME at the
destination airfield, if available.
This check verifies and quantifies the FM accuracy. It confirms the reliability of FMGS data itself and
navigation display presentation. It also validates the use of the NAV mode.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
A318/A319/A320/A321 FLEET DSC-22_20-20-20 P 11/16
FCOM 19 AUG 10
By comparing the bearing, the flight crew may evaluate the validity of the overall check. In area with
high magnetic variation change, the comparison of bearings may not be adequate.
NAVIGATION ACCURACY CHECK
Applicable to:
When GPS PRIMARY is available, the navigation accuracy check is not required.
When GPS PRIMARY is not available, the flight crew must perform this essential check:
‐ Periodically in cruise
‐ At 10 000 ft in descent.
When entering a terminal/approach area, the flight crew must monitor navigation accuracy only.
The procedure is:
‐ While en route, check the HIGH/LOW accuracy information.
• If accuracy is "LOW" (and whenever "NAV ACCUR DOWNGRAD" appears), compare raw data
　
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