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Plan Mode........................................................................................................................................................... 2/6
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DSC-22_10-50 WARNINGS AND CAUTIONS
WARNINGS AND CAUTIONS............................................................................................................................ 1/6
DSC-22_10-60 ELECTRICAL SUPPLY
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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_10-10 P 1/8
FCOM 19 AUG 10
PREAMBLE
Applicable to: ALL
This section gives a general description of the Auto Flight System and its functions:
‐ Architecture
‐ Function description
‐ Basic principle of systems:
• Reversion
• Protection
• Managed and selected guidance modes.
‐ Mode information
‐ Display characteristics
‐ Operational principles
‐ Flight crew interface (MCDU pages)
‐ Degraded modes of operations.
DESCRIPTION
Applicable to: ALL
The Flight Management Guidance System (FMGS) contains the following units:
‐ Two Flight Management Guidance Computers (FMGC)
‐ Two Multipurpose Control and Display Units (MCDU) (third MCDU optional)
‐ One Flight Control Unit (FCU)
‐ Two Flight Augmentation Computers (FAC).
GENERAL PHILOSOPHY
Applicable to: ALL
The Flight Management and Guidance System (FMGS) provides predictions of flight time, mileage,
speed, economy profiles and altitude.
It reduces cockpit workload, improves efficiency, and eliminates many routine operations generally
performed by the flight crew.
The Flight Management Guidance System (FMGS) operates as follows:
‐ During cockpit preparation the flight crew uses the Multipurpose Control and Display Unit (MCDU)
to insert a preplanned route from origin to destination. This route includes SID, EN ROUTE,
WAYPOINTS, STAR, APPROACH, MISSED APPR, and ALTN route as available from the
navigation database.
‐ Subsequently the system defines a vertical profile and a speed profile, taking into account ATC
requirements and performance criteria.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - GENERAL
DESCRIPTION
A318/A319/A320/A321 FLEET DSC-22_10-10 P 2/8
FCOM 19 AUG 10
Either FMGC performs all operations, if one FMGC fails.
The FMGS computes the aircraft position continually, using stored aircraft performance data and
navigation data. Therefore it can steer the aircraft along a preplanned route and vertical and speed
profiles. This type of guidance is said to be “managed”.
If the flight crew wants to modify any flight parameter (SPD, V/S, HDG, etc.) temporarily, they may do
so by using the various Flight Control Unit (FCU) selectors. The FMGS then guides the aircraft to the
target value of this parameter that they have selected. This type of guidance is said to be “selected”.
The two available types of guidance, then, are:
Managed guidance guides the aircraft along the ‐ preplanned route and the vertical and
speed/Mach profile. (The FMGS computes the target values of the various flight parameters).
‐ Selected guidance guides the aircraft to the target values of the various flight parameters the flight
crew selects by using the FCU selectors.
Selected guidance always has priority over managed guidance.
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 database (190 Kwords or 400 Kwords, depending upon the FMGS
standard), and each is comprised of two fields.
‐ One field, which the flight crew cannot modify, contains customized and standard navigation data:
Navaids, waypoints, airways, enroute information, holding patterns, airports, runways, procedures
　
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