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on a figure of merit and priority.
The FMS uses the following hierarchy to perform the selection:
‐ Onside GPIRS position
‐ GPIRS 3
‐ Opposite GPIRS position.
If the GPIRS data does not comply with an integrity criterion that is based on a Horizontal Integrity
Limit (HIL) and on the automatic detection of failed satellites, the FMS rejects the GPS mode and
uses the radio position update.
The flight crew can deselect/select the GPS position on the SELECTED NAVAIDS page, if
necessary.
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 4/16
FCOM 19 AUG 10
Information about the GPS position is displayed on the GPS MONITOR page.
Note: In normal operations, all ADIRUs may select the same GPS source. As a result, the data
of the GPS that is not selected may be dashed on the GPS MONITOR page, without any
detected GPS failure or triggered “GPS PRIMARY LOST” message.
GPS POSITION
Applicable to:
,
,
MSN,,
4538,,
Each IRS computes a mixed IRS/GPS position called the GPIRS position. For this, each IRS can
independently select their GPS source in order to maximize the availability of GPS data.
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 5/16
FCOM 19 AUG 10
Of the three GPIRS positions that each FMGC receives, the FMS selects one GPIRS position based
on a figure of merit and priority.
The FMS uses the following hierarchy to perform the selection:
‐ Onside GPIRS position
‐ GPIRS 3
‐ Opposite GPIRS position.
If the GPIRS data does not comply with an integrity criterion that is based on a Horizontal Integrity
Limit (HIL) and on the automatic detection of failed satellites, the FMS rejects the GPS mode and
uses the radio position update.
The flight crew can deselect/select the GPS position on the SELECTED NAVAIDS page, if
necessary.
Information about the GPS position is displayed on the GPS MONITOR page.
Note: In normal operations, all ADIRUs may select the same GPS source. As a result, the data
of the GPS that is not selected may be dashed on the GPS MONITOR page, without any
detected GPS failure or triggered “GPS PRIMARY LOST” message.
RADIO POSITION
Applicable to:
Each FMGC uses onside navaids to compute its own radio position. These navaids are displayed on
the SELECTED NAVAIDS page.
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 6/16
FCOM 19 AUG 10
The available navaids are:
‐ DME/DME
‐ VOR/DME
‐ LOC
‐ DME/DME-LOC
‐ VOR/DME-LOC.
It uses LOC to update the lateral position, using LOC beam during ILS approach.
LOC is also used for quick update, when in IRS mode.
If one or more navaids fail, each FMGC can use offside navaids to compute the VOR/DME, or the
DME/DME radio position.
The radio navaid selection is displayed on the DATA “SELECTED NAVAIDS” page.
(1) VOR/DME selection (auto or manual) for display (onside VOR).
(2) DMEs automatic selection for DME/DME onside radio position.
(3) ILS selection (auto or manual) for LOC update computation.
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 7/16
FCOM 19 AUG 10
RADIO POSITION
Applicable to:
,
,
MSN,,,,
Each FMGC uses onside navaids to compute its own radio position. These navaids are displayed on
the SELECTED NAVAIDS page.
The available navaids are:
‐ DME/DME
‐ VOR/DME
‐ LOC
‐ DME/DME-LOC
‐ VOR/DME-LOC.
It uses LOC to update the lateral position, using LOC beam during ILS approach.
LOC is also used for quick update, when in GPS/IRS mode.
If one or more navaids fail, each FMGC can use offside navaids to compute the VOR/DME, or the
DME/DME radio position.
The radio navaid selection is displayed on the DATA “SELECTED NAVAIDS” page.
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 8/16
FCOM 19 AUG 10
(1) VOR/DME selection (auto or manual) for display (onside VOR).
　
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