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AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
GENERAL
A318/A319/A320/A321 FLEET DSC-22_20-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The flight management and guidance system (FMGS) performs navigation functions and lateral and
vertical flight planning functions. It also computes performance parameters and guides the aircraft
along a preplanned route.
The Flight Management (FM) part controls the following functions:
‐ Navigation
‐ Management of flight planning
‐ Prediction and optimization of performance
‐ Management of navigation radios
‐ Management of displays
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
GENERAL
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A318/A319/A320/A321 FLEET DSC-22_20-10 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - GENERAL
A318/A319/A320/A321 FLEET DSC-22_20-20-05 P 1/2
FCOM 19 AUG 10
NAVIGATION
Applicable to: ALL
Essential navigation functions are:
‐ Computation of position
‐ Evaluation of position accuracy
‐ Radio navigation tuning
‐ Alignment of Inertial Reference System.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
NAVIGATION - GENERAL
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A318/A319/A320/A321 FLEET DSC-22_20-20-05 P 2/2
FCOM 19 AUG 10
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 1/16
FCOM 19 AUG 10
GENERAL
Applicable to:
Each FMGC computes its own aircraft position (called the "FM position") from a MIX IRS position and
a computed radio position.
The FMGS selects the most accurate position, considering the estimated accuracy and integrity of
each positioning equipment.
GENERAL
Applicable to:
,
,
MSN,,,,
Each FMGC computes its own aircraft position (called the "FM position") from a MIX IRS position and
a computed radio position, or a GPS position.
The FMGS selects the most accurate position, considering the estimated accuracy and integrity of
each positioning equipment.
GPS/INERTIAL is the basic navigation mode, provided GPS data is valid and successfully tested.
Otherwise, navaids plus inertial or inertial only are used. (Refer to DSC-22_20-20-10 Navigation
Modes).
MIX IRS POSITION
Applicable to:
Each FMGC receives a position from each of the three IRSs, and computes a mean-weighted
average called the “MIX IRS” position:
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 2/16
FCOM 19 AUG 10
If one of the IRSs drifts abnormally, the MIX IRS position ‐ uses an algorithm that decreases the
influence of the drifting IRS within the MIX IRS position.
‐ If one of the IRSs fails, each FMGC uses only one IRS (onside IRS or IRS3). Each IRS position
and inertial speed are continuously tested. If the test fails, the corresponding IRS is rejected.
When the MIX IRS position differs from the radio position by ‐ more than 12 nm, the “CHECK A/C
POSITION” message is displayed on the MCDUs.
MIX IRS POSITION
Applicable to:
,
,
MSN,,,,
Each FMGC receives a position from each of the three IRSs, and computes a mean-weighted
average called the “MIX IRS” position:
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 3/16
FCOM 19 AUG 10
‐ If one of the IRSs drifts abnormally, the MIX IRS position uses an algorithm that decreases the
influence of the drifting IRS within the MIX IRS position.
‐ If one of the IRSs fails, each FMGC uses only one IRS (onside IRS or IRS3). Each IRS position
and inertial speed are continuously tested. If the test fails, the corresponding IRS is rejected.
‐ When the "CHECK IRS (1, 2 or 3)/FM POSITION" message appears on the MCDU.
GPS POSITION
Applicable to:
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.
Of the three GPIRS positions that each FMGC receives, the FMS selects one GPIRS position based
　
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