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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - GENERAL
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A318/A319/A320/A321 FLEET DSC-21-30-10 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 1/8
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The avionics ventilation system is fully automatic.
It cools the electrical and electronic components in the avionics compartment and on the flight deck,
including the instrument and circuit breaker panels. It uses two electric fans to force the circulation of
cooling air.
Whatever the configuration of the avionics ventilation system, a part of the avionics ventilation air is
drawn from the cockpit through the various cockpit panels.
MAIN COMPONENTS
Applicable to: ALL
FANS
Two electric fans operate continuously, as long as the aircraft’s electrical system is supplied. They
make the air circulate around the avionics equipment.
SKIN AIR INLET AND EXTRACT VALVES
These valves admit air from outside the aircraft and evacuate hot air from the avionics equipment.
SKIN EXCHANGE INLET AND OUTLET BYPASS VALVES
These valves enable air to circulate between the avionics bay and the space under the cargo
compartment floor.
AIR CONDITIONING INLET VALVE
This valve opens to enable the air conditioning circuit to supply fresh air to the avionics bay.
SKIN EXCHANGE ISOLATION VALVE
This valve connects or isolates the skin heat exchanger.
AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC)
The AEVC controls the operation of all fans and valves in the avionics ventilation system.
NORMAL OPERATION, OPEN-CIRCUIT CONFIGURATION
Applicable to: ALL
GROUND OPERATIONS
The open-circuit configuration operates when skin temperature is above the on-ground threshold.
On-ground threshold = +12 °C (53 °F), temperature increasing, or
+9 °C (48 °F), temperature decreasing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 2/8
FCOM 19 AUG 10
NORMAL OPERATION, CLOSE-CIRCUIT CONFIGURATION
Applicable to: ALL
FLIGHT OPERATIONS
The close-circuit configuration operates when skin temperature is beneath the in-flight threshold.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 3/8
FCOM 19 AUG 10
In flight threshold = +35 °C (95 °F), temperature increasing, or
+32 °C (90 °F), temperature decreasing.
GROUND OPERATIONS
The close-circuit configuration operates when skin temperature is beneath the on-ground
threshold.
On ground threshold = +12 °C (53 °F), temperature increasing, or
+9 °C (48 °F), temperature decreasing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 4/8
FCOM 19 AUG 10
NORMAL OPERATION, INTERMEDIATE CONFIGURATION
Applicable to: ALL
FLIGHT OPERATIONS
The intermediate configuration operates when skin temperature is above the in-flight threshold.
In flight threshold = +35 °C (95 °F), temperature increasing, or
+32 °C (90 °F), temperature decreasing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 5/8
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
VENTILATION - AVIONICS VENTILATION
A318/A319/A320/A321 FLEET DSC-21-30-20 P 6/8
FCOM 19 AUG 10
ABNORMAL OPERATION
Applicable to: ALL
ABNORMAL OPERATION - BLOWER FAULT OR EXTRACT FAULT WARNING
When the BLOWER or the EXTRACT pushbutton switch is set at the OVRD (override) position,
the system is in closed-circuit configuration and adds air from the air conditioning system to the
ventilation air.
When the BLOWER pushbutton switch is set at OVRD, the blower fan is stopped and the extract
fan continues to run.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
　
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