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speed, lateral path and vertical plan as computed
by the FMGCs,
- manual control of the aircraft with regard to speed
and vertical plan (selected through FCU), lateral
path (through FMGC or FCU).
STL 945.7136/97 10.4
A319/A320/A321 FMGS – system interface
FCDC 1
ELAC/SEC
Landing gear
Slats/flaps
ADIRS 1
ILS 1
RA 1
VOR 1
DME 1
Clock
Fuel
Data
base
loader
FADEC 1
To FAC 1
and FMGC 1
ADIRS 3
To FAC 2
FMGC 2 To system 2
To system 1
Side 1
Side 2
MCDU
ECU
FWC 1, 2
Radio navigation
auto tuning
EIS (DM 1, 2, 3)
ELAC-SEC
CFDIU
EIS (DMC 1, 2, 3)
Actuators for :
rudder trim
yaw trim damper
rudder travel
FMGC 1
• AP/FD/ATS
• Cruise and land
modes
• Lateral nav.
• Vertical nav.
• Performance
FAC 1
• Yaw damper
• Rudder travel
limiting
• Rudder trim
• Flight envelope
protection
• Yaw AP
STL 945.7136/97 10.5
A319/A320/A321 FMGS – system redundancy
FMGC 1 Crosstalk FMGC 2
buses
FMGC 1 FMGC 2
MCDU MCDU
MCDU MCDU
FMGC 1 FMGC 2
MCDU MCDU
Two FMGCs associated to two MCDUs provide a
redundant configuration.
􀁺 Normal mode operation : dual mode
- Each FMGC makes its own computation
- One FMGC is MASTER – the other one is SLAVE
- Both MCDUs act independently (entries are
automatically recopied on the other MCDU and
applied to both FMGCs)
􀁺 Independent mode
- Automatically operative if mismatch between
FMGCs
- Independent operation of FMGCs with associated
MCDUs. (Data insertion and display related to the
side concerned).
- One FMGC remains master.
􀁺 Single mode
- One FMGC fails
- Either MCDU can be used to enter or display data
related to the remaining FMGC.
STL 945.7136/97 10.6
A319/A320/A321 FMGS crew interface
ND 1 control FCU ND 2 control
PFD 1 ND 1 ND 2 PFD 2
Guidance
display
Navigation
display
Navigation
display
Guidance
FADEC display
MCDU 1 Thrust levers MCDU 2
STL 945.7136/97 10.7
A319/A320/A321 FMGS crew interface
􀁺 Two MCDUs on the central pedestal provide long-term
interface between the crew and FMGCs in terms of :
- flight plan definition and display
- data insertion (speeds, weights, cruise level, etc)
- selection of specific functions (direct to, offset,
secondary flight plan).
􀁺 One FCU on the central glareshield to provide shortterm
interface between crew and FMGCs.
􀁺 Two thrust levers linked to the FMGCs and FADECs
provide autothrust or manual thrust control selection to
the crew.
􀁺 Two PFDs and two NDs provide visual interface with
flight management and guidance related data such as :
on PFD :
- FMGS guidance targets,
- armed and active modes
- system engagement status
on ND :
- flight plan presentation,
- aircraft position and flight path,
- navigation items (radio navaid, wind).
STL 945.7136/97 10.8
A319/A320/A321 FMGS flight guidance
Auto control
white lights
Heading / track
window
Vertical speed /
Flight Path angle
Altitude window
window
Auto control
white lights
Speed / Mach
Commutation
Speed / Mach
window
AP / A / THR
engagement
Mode engagement
Altitude
selection
V / S or FPA
selection
Control the display of selected altitude
(in meters) on lower ECAM (permanent data)
􀁺 Managed guidance parameter window is dashed and auto control illuminated.
Managed speed guidance Lateral selected guidance
HDG or TRK
selection
SPD or TRK
selection
STL 945.7136/97 10.9
A319/A320/A321 FMGS flight guidance
􀁺 The FCU is the main crew interface for short-term
guidance with a single rule for the various control
knobs :
- pull + rotate = pilot input
- push = return to FMGS control.
􀁺 As an example, a change of altitude can be achieved
by a double action on the FCU :
- either by selection of a new altitude through the
FCU selector and validation of this new
altitude pushing (management guidance)
this knob.
- or by selection of a V / S through the FCU
selector and validation of this new V
/ S by pulling this knob.
􀁺 Actions on the FCU are displayed on the FCU as well
　
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