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(SIDs, STARs, etc.), company routes, fuel policy, alternates.
The airline updates this part every 28 days, and is responsible for defining, acquiring, updating,
loading, and using this data.
The data goes into each FMGC separately, although it can be copied from one FMGC to the other,
if the system has the optional crossload function. This updating operation takes about 20 min.
‐ The second field contains elements stored by the flight crew that enable them to create 20
waypoints, 10 runways, 20 navaids, and 3 routes.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_10-10 P 3/8
FCOM 19 AUG 10
Note: When the two FMGCs are not working with the same database, the FMGS operates in
independent mode. Refer to DSC-22_10-30 Independent Mode.
‐ Each FMGC also contains an integrated performance database, used by the FM part, for
computing predictions. The airline does not have access to this database.
FLIGHT MANAGEMENT GUIDANCE COMPUTER (FMGC)
Applicable to:
Each FMGC is divided into two main parts:
‐ The Flight Management (FM) part controls the following functions:
• Navigation and management of navigation radios
• Management of flight planning
• Prediction and optimization of performance
• Display management.
‐ The Flight Guidance (FG) part performs the following functions:
• Autopilot (AP) command
• Flight Director (FD) command
• Autothrust (A/THR) command.
Each FMGC has its own set of databases. The individual databases can be independently loaded
into their respective FMGC, or independently copied from one FMGC to the other.
Each FMGC contains these main databases:
1. The Navigation database (2.8 Mbytes) contains standard navigation data: Navaids, waypoints,
airways, enroute information, holding patterns, airports, runways, procedures (SIDs, STARs, etc.),
company routes, alternates.
The airline updates this part every 28 days, and is responsible for defining, acquiring, updating,
loading, and using this data. The updating operation takes 20 min to complete or 5 min if cross
loaded from the opposite FMGC.
2. The Airline Modifiable Information (AMI), also described as the FM Airline Configuration file,
contains:
‐ Airline policy values: THR RED altitude, ACC altitude, EO ACC altitude, PERF factor, IDLE
factor.
‐ Fuel policy values: Fuel for taxi, % of route reserve, maximum and minimum values of route
reserve, etc.
‐ AOC functions customization.
3. The Aircraft Performance database includes the Engine model, Aerodynamical model, and
Performance model. The airline cannot modify this database.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_10-10 P 4/8
FCOM 19 AUG 10
4. The Magnetic Variation database.
5. Each FMGC contains elements stored by the flight crew that enable them to create 20 waypoints,
10 runways, 20 navaids, and 5 routes.
FLIGHT MANAGEMENT GUIDANCE COMPUTER (FMGC)
Applicable to:
,
,
MSN,,
4538,,
Each FMGC is divided into two main parts:
The Flight Management (FM) part ‐ controls the following functions:
• Navigation and management of navigation radios
• Management of flight planning
• Prediction and optimization of performance
• Display management.
‐ The Flight Guidance (FG) part performs the following functions:
• Autopilot (AP) command
• Flight Director (FD) command
• Autothrust (A/THR) command.
Each FMGC has its own set of databases. The individual databases can be independently loaded
into their respective FMGC, or independently copied from one FMGC to the other.
Each FMGC contains these main databases:
1. The Navigation database (5 Mbytes) contains standard navigation data: Navaids, waypoints,
airways, enroute information, holding patterns, airports, runways, procedures (SIDs, STARs, etc.),
company routes, alternates.
The airline updates this part every 28 days, and is responsible for defining, acquiring, updating,
loading, and using this data. The updating operation takes 20 min to complete or 5 min if cross
loaded from the opposite FMGC.
2. The Airline Modifiable Information (AMI), also described as the FM Airline Configuration file,
contains:
‐ Airline policy values: THR RED altitude, ACC altitude, EO ACC altitude, PERF factor, IDLE
factor.
‐ Fuel policy values: Fuel for taxi, % of route reserve, maximum and minimum values of route
reserve, etc.
‐ AOC functions customization.
　
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