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as on the PFD in the dedicated FMA (Flight
Management Annunciator) part.
STL 945.7136/97 10.10
A319/A320/A321 FMGS flight management
Flight plan stringing
Flight plan definition by company route or city pair.
Departure and arrival procedures including associated,
speed/altitude/time constraints.
Flight plan revision (offset, DIR, TO, holding pattern,
alternative flight plan activation,…)
Secondary flight plan creation similar to primary flight plan.
Navigation
Automatic guidance along flight plan from take-off to
approach.
Aircraft position determination.
Aircraft position referenced to the flight plan.
Automatic VOR/DME/ILS/ADF selection.
IRS alignment.
Ground speed and wind computation.
Optimum radio and inertial sensor mixing.
Provision for GPS and MLS.
STL 945.7136/97 10.11
A319/A320/A321 FMGS performance management
􀁺 Flight plan optimization, through the performance data
base, in terms of :
- optimum speeds
- optimum altitudes.
􀁺 The computations are based on :
- flight conditions (cruise level, weights, center of
gravity, meteorological data)
- cost index
- speed entered on the FCU or given in the flight
plan.
􀁺 Performance predictions :
- time, altitude, speed at all waypoints
- estimated time of arrival, distance to destination,
estimated fuel on board at destination.
􀁺 Advisory functions :
- fuel planning
- optimum altitudes and step climb.
􀁺 Full vertical guidance related to flight plan predictions
from initial climb to approach.
STL 945.7136/97 10.12
A319/A320/A321 FMGS - lateral navigation
Radio or GPIRS position (if GPS primary installed)
IRS 1 FMGC position
IRS 3
IRS 2
Mix IRS
Mix IRS = mean IRS
GIPRS = GPS position integrity verified against IRS position
To see the
navaids used for
radio position
STL 945.7136/97 10.13
A319/A320/A321 FMGS - lateral navigation
􀁺 Position computation :
- before flight, the three IRSs are aligned on airfield
or gate position. (manually or via database)
- at take-off, the position is automatically updated to
the runway threshold
- in flight, position updating is computed using GPS if
installed, and radio navaids (DME,VOR, ILS)
The FMGC position depends upon the IRS’s mean,
the GPS and the radio position.
􀁺 Navigation mode selection :
- if the aircraft is equipped with GPS primary, the
FMGC uses GPIRS position in priority
- if the GPIRS position is not available or if the
aircraft is not equipped with GPS primary,
depending upon availability of navaids and sensors,
FMGC automatically tunes the best navaids to
compute the most accurate position.
The navigation modes may be :
En route :
IRS – GPS (if GPS installed)
IRS – DME
IRS – VOR/DME
IRS only
In approach :
IRS – GPS (if GPS installed)
IRS – DME
IRS – VOR/DME
IRS – ILS/DME
STL 945.7136/97 10.14
A319/A320/A321 FMGS - lateral navigation
ND
MCDU
STL 945.7136/97 10.15
A319/A320/A321 FMGS - lateral navigation
􀁺 FMGC provides the crew with lateral position and its
associated accuracy criteria which depend upon :
- FMGC Error Position Estimate (EPE)
- zone currently flown (en route, terminal, approach)
- Airworthiness Authorities Accuracy Requirements
(AAAR)
􀁺 If EPE ≤ AAAR then HIGH is displayed on MCDU and
the computed positions may be used without
restriction.
􀁺 If EPE > AAAR then LOW is displayed on MCDU and
the position must be cross-checked with raw data
(ADF/VOR needles, DME reading).
􀁺 Each time HIGH (or LOW) reverts to LOW (or HIGH)
the message NAV ACCY DOWNGRADED (or
UPGRADED) is displayed on NDs and MCDUs.
STL 945.7136/97 10.16
A319/A320/A321 flight deck – main features
Take-off Climb Cruise
Descent Approach
V2+10
V2+10
Acc. Alt.
Take-off
runway
Thrust
reduction
Climb
Acceleration by
energy sharing
Alt.
Level segment
ECON
cruise Mach
Transition from
speed to Mach
Transition
Mach/speed
ECON CRZ
Mach
Top of descent
Cruise
Top of climb
ECON DES
speed Deceleration at 500ft/min
average
“At or below”
constraint
“At”
constraint
“At or below”
constraint
Speed limit
　
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