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The normal and recommended way to use the Auto Flight
System is to use it to follow the flight plan
automatically.
Knowing the position of the aircraft and the desired
flight plan (chosen by the pilot), the system is able
to compute the orders sent to the surfaces and engines
so that the aircraft follows the flight plan.
The pilot has an important monitoring role.
NOTE: During Auto Flight System operation, side sticks
and thrust levers do not move automatically.
AFS/FLY BY WIRE
If the pilot moves the side stick when the Auto Flight
System is active, it disengages the autopilot.
Back to manual flight, when the side stick is released,
the Electrical Flight Control System maintains the
actual aircraft attitude.
SYSTEM DESIGN
To meet the necessary reliability, the AutoFlight
System is built around four computers:
Two interchangeable Flight Management and Guidance
Computers (FMGCs) and two interchangeable Flight
Augmentation Computers (FACs).
It is a FAIL OPERATIVE system.
Each Flight Management and Guidance Computer and each
Flight Augmentation Computer has a command part and a
monitor part to be FAIL PASSIVE.
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AUTO FLIGHT SYSTEM DESIGN PHILOSOPHY
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22 - AUTO FLIGHT SYSTEM
22-00-00 AUTO FLIGHT SYSTEM PRESENTATION
CONTENTS:
General
Controls
FMGCs
FACs
Other Systems
Self Examination
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AUTO FLIGHT SYSTEM PRESENTATION
GENERAL
The Auto Flight System (AFS) provides the pilots with
functions reducing their workload and improving the
safety and the regularity of the flight.
The Auto Flight System is designed around:
- 2 Flight Management and Guidance Computers (FMGCs),
- 2 Flight Augmentation Computers (FACs),
- 2 Multipurpose Control and Display Units (MCDUs),
- 1 Flight Control Unit (FCU).
CONTROLS
The FCU and the MCDUs enable the pilots to control the
functions of the FMGCs.
The FAC engagement pushbuttons and the rudder trim
control panel are connected to the FACs.
The MCDUs are used for long-term control of the
aircraft and provide the interface between the crew
and the FMGC allowing the management of the flight.
The FCU is used for short term control of the aircraft
and provides the interface required for transmission
of engine data from the FMGC to the Full Authority
Digital Engine Control (FADEC).
FMGCs
There are two interchangeable FMGCs.
Each FMGC is made of two parts: the Flight Management
part called FM part and the Flight Guidance part called
FG part.
The Flight Management part provides functions related
to flight plan definition, revision and monitoring.
The Flight Guidance part provides functions related
to the aircraft control.
FACs
The basic functions of the FACs are the rudder control
and the flight envelope protection.
NOTE: The FAC includes an interface between the Auto
Flight System and the Centralized Fault Display
System (CFDS) called Fault Isolation and
Detection System (FIDS).
This function is activated only in position 1
(FAC 1).
OTHER SYSTEMS
The Auto Flight System is connected to the majority
of the aircraft systems.
Examples of Auto Flight System data exchanges:
- Reception of the aircraft altitude and attitude from
the Air Data and Inertial Reference System (ADIRS).
- Transmission of autopilot orders to the Elevator and
Aileron Computers (ELACs).
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AUTO FLIGHT SYSTEM PRESENTATION
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