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STL 945.7136/97 11.5
A319/A320/A321 ECS – air conditioning – pneumatic - general
Air conditioning
Continuous air renewal and temperature regulation in three
independently controlled zones (cockpit, forward cabin, aft
cabin).
Downstream both packs, a dedicated unit mixes cold air
with recirculated cabin air for distribution to the three
zones.
Optimized air temperature is obtained by adding engine
hot air to mixing unit air via three trim air valves.
Cabin and pack temperature regulation are achieved by a
zone controller and two pack controllers.
Pneumatic
High pressure air is supplied for air conditioning, air
starting, wing anti-ice, water pressurization, hydraulic
reservoir pressurization.
System operation is electrically monitored by two Bleed
Monitoring Computers (BMC), and is pneumatically
controlled.
A leak detection system is provided to detect any
overheat in the vicinity of the hot air ducts.
STL 945.7136/97 11.6
A319/A320/A321 ECS flight deck – main features
Avionics bay
Open if T > 35°C in flight
Skin heat
exchanger
Skin heat
exchanger
outlet bypass
valve
Inlet
valve
Blower
fan
Evaporator
Air conditioning
duct
Avionics
equipment
Extract
fan
Condensor
Skin heat
exchanger
isolation
valve
Extract
valve
Overboard
Closed on
ground
Cargo
underfloor
Skin heat exchanger
inlet
bypass valve
Ground
cooling
unit
(optional)
STL 945.7136/97 11.7
A319/A320/A321 ECS - ventilation
Avionics ventilation
Provide ventilation and cooling of avionics and electronic
equipment under digital control (AEVC) and without any
crew intervention.
Three main operational configurations are automatically
selected :
closed-circuit configuration (flight) by means of an
aircraft skin heat exchanger and a pair blower and
extract fans,
open-circuit configuration using outside fresh air
through opening of inlet and extract valves,
an intermediate flight configuration is selected in case of
high temperature, whereby the skin exchanger outlet
bypass valve is opened and the extract valve is
maintained half open.
•
•
•
Battery ventilation
Achieved by ambient air being drawn around the
batteries and then vented directly outboard via a venturi.
Lavatory & galley ventilation
Achieved by ambient cabin air extracted by a fan
exhausted near the outflow valve.
STL 945.7136/97 11.8
A319/A320/A321 ECS – cabin pressure control
Unpressurized areas
Safety valves
Outflow
valve
Controllers
ADIRS
FMGS
Cabin pressure panel
Cabin pressure
controller 1
Cabin pressure
controller 2
Manual
control
3 motors
and gears
Flap type outflow valve DU 2 CRZ page DU 2 press system page
TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG TAT + 19 °C
SAT + 18 °C 23 H 56
G.W. 60300 KG
STL 945.7136/97 11.9
A319/A320/A321 ECS – pressurization
􀁺 The pressurization control system operates fully
automatically without any crew action.
􀁺 Dual system with automatic switchover after failure.
Alternative use for each flight. A single outflow valve is
operated by one of three independent electric motors.
Two of these are associated with automatic controllers.
􀁺 In normal operation, cabin altitude and rate of change
are automatically controlled from FMGC flight plan data :
- cruise FL, landing field elevation, QNH,
- time to top of climb, time to landing.
􀁺 In case of dual FMGC failure, the crew has to manually
select the landing elevation. The cabin altitude varies
according to a preprogrammed law.
􀁺 In case of failure of both pressurization system autocontrollers,
the manual back-up mode is provided
through the third outflow valve motor.

STL 945.7136/97 12.1
12. Electronic instrument system
STL 945.7136/97 12.2
A319/A320/A321 EIS – EFIS/ECAM architecture
ND
2
Inputs for EFIS displays : ADIRS, FMGC, FACs, FCU
ADFs, VORs, DMEs, ILS, Ras’ WXRs.
Input for ECAM display : FADEC, FQI, WBCs
DMC 1
PFD
1
ND
1
EFIS 1 EFIS 2
ECAM
DU 1
ECAM
DU 2
ECAM control panel
DMC 3
PFD
2
DM 2
CAUT
WARN
FWC 1
SDAC 1 SDAC 2
　
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