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- performance predictions as time, fuel,
altitude, wind at various points of the flight,
- guidance computation along the vertical flight
plan.
A performance data base provides necessary data;
however pilots have to enter other data using the MCDU.
GUIDANCE
The Flight Guidance part provides the autopilot, Flight
Director and autothrust functions.
These functions work according to modes generally
chosen on the FCU.
The normal way to operate the aircraft is to use the
management part as reference source for the guidance
part.
AP
The autopilot (AP) function calculates the signals for
the flight controls in order to follow the selected
modes.
The autopilot controls the pitch, roll and yaw axis
according to the selected modes.
Example of autopilot mode: Altitude hold.
FD
The Flight Director (FD) displays the guidance commands
on both Primary Flight Displays (PFDs), allowing the
pilots to fly the aircraft manually according to the
FMGC demands.
Two cases have to be considered:
Autopilot not engaged:
-The FD function displays symbols on the PFD which
gives orders to the pilot to maintain the desired
parameter(s). In this case, the pilot follows these
orders by acting on the flight controls.
Autopilot engaged:
-The FD function displays symbols on the PFD
representing the autopilot orders to be monitored by
the pilot.
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EFFECTIVITY Page 18
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FMGC GENERAL
A/THR
The autothrust (A/THR) function calculates the signal
necessary for engine control in order to follow a given
mode.
Example of autothrust mode: Acquisition and holding
of a speed or a Mach number
DISPLAYS
Various displays are used to present Flight Management
and Guidance System (FMGS) data and information.
The main displays presenting Flight Management and
Guidance information are:
- the Multipurpose Control and Display Units
(MCDUs/Display part),
- the Flight Control Unit (FCU/Display Part),
- the Primary Flight Displays (PFDs),
- the Navigation Displays (NDs),
- the ECAM Engine/Warning Display (EWD) and ECAM
STATUS pages.
MCDUs (DISPLAY PART)
The MCDUs display all data related to the management
part.
Example: Identification of the successive waypoints
of the flight plan.
FCU (DISPLAY PART)
The FCU is also considered as a display as it includes
indication lights and Liquid Cristal Display (LCD)
windows.
The FCU includes:
- lights giving mode indications,
- Liquid Cristal Display windows showing
reference parameters.
Example: During a climb with autopilot, the altitude
window displays the altitude the aircraft is going to
capture.
PFDs
The PFDs mainly display the flight director symbols
and the status of guidance functions and their modes.
It also displays reference parameters.
Example: The target speed value is represented by a
symbol on the speed scale of the PFD.
NDs
The NDs mainly display the flight plan and various
navigation data.
Example: Airports or waypoints around the present
position of the aircraft.
ECAM
The ECAM Engine/Warning Display (EWD) page presents
warning messages related to function or computer
failures.
The ECAM STATUS page displays the landing capabilities.
TMUFGCB02-T01 LEVEL 1
EFFECTIVITY 22-00-00 Page 5
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 19
ALL
SELF EXAMINATION
The Flight Guidance functions are:
A - autopilot, Flight Director, autothrust.
B - autopilot modes.
C - guidance along a flight plan.
Aircraft position determination is computed by:
A - the guidance part of the FMGCs.
B - the management part of the FMGCs.
C - the FCU.
The automatic selection of navigation frequencies
is made by:
A - the MCDU.
B - the guidance part of the FMGCs.
C - the management part of the FMGCs.
TMUFGCB02 LEVEL 1
EFFECTIVITY 22-00-00 Page 6
Dec 31/95
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 20
ALL
22 - AUTO FLIGHT SYSTEM
22-10-00 AUTOPILOT
CONTENTS:
General
Modes
Ground
Take-off
Cruise
Landing
　
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