A319/A320/A321
TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE
22 AUTO FLIGHT SYSTEM

This document must be used for training purpose only
Under no circumstances should this document be used as a reference.
It will not be updated.
All rights reserved.
No part of this manual may be reproduced in any form,
by photostat, microfilm, retrieval system, or any other means,
without the prior written permission of Airbus Industrie.

AUTO FLIGHT SYSTEM GENERAL
System Design Philosophy (1) ..................... 1
** System Presentation (1) ....................... 5
** FAC General (1) ................................ 9
FMGC General (1) ................................. 15
** Autopilot (1) ................................. 21
Flight Director (1).............................. 27
Autothrust (1) ................................... 33
** System Control and Indicating (1) ........... 41
Basic Operational Principles (1)................ 55
** AFS Maintenance System (3) ................... 61
FLIGHT AUGMENTATION
** Yaw Axis Control D/O (3) ..................... 73
** FAC Engagement (3)............................ 77
** Rudder Travel Limiting Function (3) ......... 81
** Rudder Trim Function (3) ..................... 85
** Yaw Damper Function (3) ...................... 91
** Flight Envelope Protection (3)............... 97
Flight Envelope Data on PFD (3)................ 103
** FAC Warnings (3)............................. 111
FLIGHT GUIDANCE
Flight Guidance Priority Logic (3) ............ 113
Flight Control Unit D/O (3) .................... 125
Flight Mode Annunciator D/O (3)................ 141
FLIGHT MANAGEMENT
Flight Management Priority Logic (3) .......... 147
Flight Planning (3)............................. 153
** MCDU Description (3) ........................ 159
EFIS Display (3) ................................ 171
** Data Base Loading (3) ....................... 181
FMGS Cockpit Preparation (3) ................... 217
FMGS Warnings (3)............................... 235
INTERFACES
** FAC Interfaces (3) .......................... 243
** FMGC Interfaces (3) ......................... 251
FCU Interfaces (3).............................. 261
MCDU Interfaces (3)............................. 267
AUTO FLIGHT SYSTEM
** Components (3)............................... 273
MAINTENANCE PRACTICES
SPECIFIC PAGES
CFDS Specific Page Presentation (3) ......... 285
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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22 AUTO FLIGHT SYSTEM
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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22 - AUTO FLIGHT SYSTEM
22-00-00 AUTO FLIGHT SYSTEM DESIGN
PHILOSOPHY
CONTENTS:
General Concept
Navigation
Flight Plan
Operation
AFS/Fly by Wire
System Design
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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AUTO FLIGHT SYSTEM DESIGN PHILOSOPHY
GENERAL CONCEPT
The Auto Flight System (AFS) calculates orders to
automatically control the flight controls and the
engines.
The Auto Flight System computes orders and sends them
to the Electrical Flight Control System (EFCS) and to
the Full Authority Digital Engine Control (FADEC) to
control flying surfaces and engines.
When the AFS is not active, the above mentioned
components are controled by the same systems but orders
are generated by specific devices (i.e. side sticks
and thrust levers).
NAVIGATION
A fundamental function of the Auto Flight System is
to calculate the position of the aircraft.
When computing the aircraft position, the system uses
several aircraft sensors giving useful information for
this purpose.
FLIGHT PLAN
The system has several flight plans in its memory.
These are predetermined by the airline.
A flight plan describes a complete flight from
departure to arrival, it includes vertical information
and all intermediate waypoints.
It can be displayed on the instruments (CRTs).
OPERATION
There are several ways to use the Auto Flight System.
　
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