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OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 13/16
FCOM 19 AUG 10
POSITION MONITOR
Applicable to:
,
,
MSN,,
4617,
The flight crew may check the position computation using the GPS MONITOR or POSITION
MONITOR page.
TAKEOFF UPDATE
Applicable to:
A takeoff update requires that the takeoff runway be part of the flight plan. This provides the most
accurate position update.
If the takeoff run starts at an intersection, enter a takeoff shift on the PERF TO page to refine the
takeoff update.
An accurate takeoff update ensures a precise aircraft position during departure.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 14/16
FCOM 19 AUG 10
TAKEOFF UPDATE (GPS PRIMARY NOT ACTIVE)
Applicable to:
,
,
MSN,,,,
A takeoff update requires that the takeoff runway be part of the flight plan. This provides the most
accurate position update.
If the takeoff run starts at an intersection, enter a takeoff shift on the PERF TO page to refine the
takeoff update.
An accurate takeoff update ensures a precise aircraft position during departure.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 15/16
FCOM 19 AUG 10
NAVIGATION MODES
Applicable to:
The FMGS updates the FM position via the use of radio navaids. It can use three different FM
navigation modes to make this update.
The decreasing order of priority is:
‐ IRS-DME/DME
‐ IRS-VOR/DME
‐ IRS only.
During ILS approaches, the system performs a temporary lateral update, via one of the following
modes:
‐ IRS-DME/DME-LOC
‐ IRS-VOR/DME-LOC
‐ IRS-LOC.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - POSITION COMPUTATION
A318/A319/A320/A321 FLEET DSC-22_20-20-10 P 16/16
FCOM 19 AUG 10
NAVIGATION MODES
Applicable to:
,
,
MSN,,,
The FMGS updates the FM position via the use of radio navaids or GPS, if available. It can use four
different FM navigation modes to make this update.
The decreasing order of priority is:
‐ IRS-GPS
‐ IRS-DME/DME
‐ IRS-VOR/DME
‐ IRS only.
During ILS approaches, the system performs a temporary lateral update, via one of the following
modes:
‐ IRS-GPS/LOC
‐ IRS-DME/DME-LOC
‐ IRS-VOR/DME-LOC
‐ IRS-LOC.
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 1/16
FCOM 19 AUG 10
GENERAL
Applicable to:
The FMGS continuously computes an Estimated Position Uncertainty (EPU).
It is an estimate of how much the FM position diverged, and it is a function of the navigation mode
that the system uses.
CURRENT NAV MODE EPU
(RATE or THRESHOLD)
REMARK
IRS/DME/DME Moves toward 0.28 nm. EPU decreases from initial value to
0.28 nm.
IRS/VOR/DME 0.1 nm + 0.05 X DME DIST.
Minimum : 0.28 nm.
Dependent on the distance between the
aircraft and the VOR/DME.
IRS ONLY +8 kt for the first 21 min.
+2 kt after.
EPU increases continuously.
Note: After an IRS alignment or at takeoff, the EPU is set to 0.2 nm.
GENERAL
Applicable to:
The FMGS continuously computes an Estimated Position Uncertainty (EPU).
It is an estimate of how much the FM position diverged, and it is a function of the navigation mode
that the system uses.
CURRENT NAV MODE EPU
(RATE or THRESHOLD)
REMARK
IRS/GPS
(in meters).
FOM = Figure of Merit of GPS.
If above 0.28 nm, the FMS rejects the
GPS position.
IRS/DME/DME Moves toward 0.28 nm. EPU decreases from initial value to
0.28 nm.
IRS/VOR/DME 0.1 nm + 0.05 X DME DIST.
Minimum : 0.28 nm.
Dependent on the distance between the
aircraft and the VOR/DME.
IRS ONLY +8 kt for the first 21 min.
+2 kt after.
EPU increases continuously.
Note: After an IRS alignment or at takeoff, the EPU is set to 0.2 nm.
GENERAL
Applicable to:
The FMGS continuously computes an Estimated Position Uncertainty (EPU).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
　
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