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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.
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 12/16
FCOM 19 AUG 10
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.
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.
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 13/16
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 14/16
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:
,
,
MSN,,
4617,
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
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.
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 15/16
FCOM 19 AUG 10
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.
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - EVALUATION OF POSITION ACCURACY
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_20-20-20 P 16/16
　
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