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TO / GA TO / GA
Thrust levers
STL 945.7136/97 10.23
A319/A320/A321 FMGS – autothrust function
Operational rules
􀁺 A/THR can be engaged :
- manually by pressing the A/THR pushbutton
- automatically, by setting the thrust levers at TO/GA
or FLEX position.
􀁺 A/THR is then activated if thrust levers are set between
CL (included) and IDLE (excluded) gates.
In this case, commanded thrust is limited by TLA
(except ALPHA-FLOOR activation).
􀁺 A/THR not active (A/THR p/b on FCU extinguished)
and
thrust levers within A/THR range
􀁺 A/THR can be disengaged by :
Depressing the instinctive disconnect P/B on the levers
or depressing the illuminated A/THR P/B on FCU or
setting both thrust levers in IDLE gate.
Pressing A/THR p/b on FCU activates A/THR
STL 945.7136/97 10.24
A319/A320/A321 FMGS – autothrust function
􀁺 If the levers are in CLB gate and A/THR is disengaged
then :
- thrust is frozen at its current value until thrust levers
are moved out of the gate.
THR LK amber message appear on PFD.
􀁺 If the levers are not in CLB gate when A/THR is
disengaged then :
- thrust is not frozen but is set according to the lever
position.
􀁺 Engagement of A/THR mode is automatic according to
AP/FD engaged mode :
AP/FD mode ATS mode
V/S-FPA
ALT (ACQ/HOLD)
Expedite
Descent/Climb
SPD/Mach
final descent
Approach glide
flare
TO/ GA
SPD/Mach
Thrust
Thrust/SPD/Mach
Thrust
SPD
SPD
Retard
ATS Armed
STL 945.7136/97 10.25
A319/A320/A321 FMGS – autothrust function
Autothrust operation
􀁺 Take-off performed :
- in TO limit mode with levers in TO.GA notch
- in FLEX TO limit mode with levers in FLX TO/MCT
detent provided a FLX temperature has been entered
on MCDU (take-off page). Lowest FLX TO thrust is
automatically limited to CL thrust.
Note : In both cases, this manoeuvre also engages
the flight director TO mode.
􀁺 Once out of take-off (or go around), the nominal phases
in autothrust are always :
- CL gate in twin engine situation
- MCT gate in single engine situation
- One lever in CL gate and the other out of this gate (in
twin-engine operation) causes the engines to be
regulated differently. ASYM amber message appears
on PFD
􀁺 In approach, A/THR control depends on type of
approach (ILS, non precision) and vertical mode
selected on FCU.
􀁺 If Alpha floor function is activated, TO/GA thrust is
automatically applied whatever the lever position and
A/THR status are.
This is indicated to
the crew by a CLB
or MCT message
on PFD

STL 945.7136/97 11.1
11. Environmental control system

STL 945.7136/97 11.3
A319/A320/A321 ECS – system schematic
Air conditioning Pneumatic
ATA 21 ATA 36
Pack 2
Pack
valves
Pack 1
Bleed air
regulation
To wing
Eng 2
APU
Cross-bleed valve
HP ground-connection
APU bleed
valve
APU control unit
Bleed air
regulation
Eng 1
Extraction
fan
To wing anti ice
Nonreturn
valve
Filter
Recirculation fan
Mixer unit
Pressure
regulating valve
Trim air
valves
Trim air
valves
Hot manifold
Trim air
valves
Non-return valve
Filter
Nonreturn
valve
Nonreturn
valve
Recirculation fan
Air distribution
Air generation
LP ground connection
Emergency ram air
Flight
deck
Electr
comp.
Extraction
fan
Electr. vent
Venturi Isolation valve
Cabin
ambient air
Fwd zone
Fwd cargo com.
Aft zone
Aft cargo comp.
Isolation valve
Outflow
valve
Trim air valve Pressure regulating valve
Safety
valve
STL 945.7136/97 11.4
A319/A320/A321 ECS – temperature and flow control
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG
Variable flow selector
Automatic temperature control selectors
Flight deck
Space optional
FWD + AFT cargo heat
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG
System display :
Cruise page
Cargo heat - optional
System display :
CON system page
System display :
BLEED system page
A321
A319/A320
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG
　
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