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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
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SELF EXAMINATION
What are the functions of the FACs?
A - Yaw damper, rudder trim, rudder travel
limitation, flight envelope protection.
B - Yaw damper, pitch trim, rudder trim,
flight envelope protection.
C - Yaw damper, rudder trim, pitch trim.
The yaw damper provides:
A - dutch roll damping and yaw guidance
order execution.
B - turn coordination and engine failure
compensation.
C - A and B.
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22 - AUTO FLIGHT SYSTEM
22-00-00 FMGC GENERAL
CONTENTS:
Controls
MCDUs (Control Part)
FCU (Control Part)
Management
Flight Plan
Lateral Functions
Vertical Functions
Guidance
AP
FD
A/THR
Displays
MCDUs (Display Part)
FCU (Display Part)
PFDs
NDs
ECAM
Self Examination
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FMGC GENERAL
CONTROLS
The Flight Management and Guidance Computer(FMGC)
functions, Flight Management and Flight Guidance, are
mainly controlled from the Multipurpose Control and
Display Units (MCDUs) and the Flight Control Unit
(FCU).
Typical actions are:
- Before departure, on the MCDUs, the pilots
select the flight plan which will be followed
later on by the aircraft.
- In flight, on the FCU, the pilots can engage
the autopilot and can modify different flight
parameters leading to an immediate change in
the control of the aircraft.
MCDUs (CONTROL PART)
Basically, the MCDUs provide the long term interface
between the crew and the FMGCs.
The MCDUs allow, for example:
- the introduction or the definition, the
modification and the display of flight plans,
- the display, the selection and the modification
of the parameters associated with the flight
management functions,
- the selection of specific functions.
FCU (CONTROL PART)
Basically, the FCU provides the short term interface
between the crew and the FMGCs.
The FCU allows, for example:
- the engagement of the autopilot, Flight
Director and autothrust functions,
- the selection of required guidance modes
(e.g. heading hold),
- the selection of various flight parameters
(e.g. heading value).
MANAGEMENT
The Flight Management part mainly provides the flight
plan selection with its lateral and vertical functions.
The Flight Management part provides navigation,
performance optimization, radio navigation tuning and
information display management.
Data computed by the Flight Management part is
occasionally used by the Flight Guidance part.
FLIGHT PLAN
A flight plan contains the various elements and
constraints of the route the aircraft must fly along
from take-off to landing.
A flight plan can be selected, built-up, modified and
monitored through the MCDU.
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FMGC GENERAL
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FMGC GENERAL
LATERAL FUNCTIONS
The main lateral functions are:
- aircraft position determination,
- IRS alignment through the MCDU,
- automatic or manual (through MCDU) selection
of VOR, DME, ILS, ADF frequencies,
- guidance computation along the lateral flight
plan.
A navigation data base provides all necessary
information to build a flight plan; however pilots can
enter other data using the MCDU.
VERTICAL FUNCTIONS
The main vertical functions are:
- optimized speed computation; the resulting
target speed being used as reference for
guidance functions,
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