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When, on ground, the differential pressure is still
above 2.5 hPa (0.036 PSI) 12 s after last engine
shutdown.
CRC MASTER
WARN
CAB
PRESS
NIL
1 to 9
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - WARNINGS AND CAUTIONS
A330/A340 FLEET DSC-21-20-50 P 3/4
FCOM 19 AUG 10
MEMO DISPLAY
The “MAN LDG ELEV” message is displayed in green, if the LDG ELEV selector is not in the
AUTO position.
This message becomes amber in Phases 1 and 2.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - WARNINGS AND CAUTIONS
Intentionally left blank
A330/A340 FLEET DSC-21-20-50 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - ELECTRICAL SUPPLY
A330/A340 FLEET DSC-21-20-60 P 1/2
FCOM 19 AUG 10
BUS EQUIPMENT LIST
Applicable to: ALL
NORM EMER ELEC
AC DC DC
BAT
AC
ESS
DC
ESS HOT
1 X
PRESS CAB PRESS 2 DC2
CONT MANUAL CONTROL X
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - ELECTRICAL SUPPLY
Intentionally left blank
A330/A340 FLEET DSC-21-20-60 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - GENERAL
A330/A340 FLEET DSC-21-30-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The ventilation system includes ventilation for :
the avionics,‐
the batteries,‐
the la‐vatories and galleys,
the pack bay.‐
Note: For a description of the cargo ventilation Refer to DSC-21-40-10 GENERAL.
Two computers are provided :
the Avionic Equipments Ventilation Controller (AEVC),‐
and the Ventilation Controller.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - GENERAL
Intentionally left blank
A330/A340 FLEET DSC-21-30-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The avionics ventilation system is fully automatic.
It cools the electrical and electronic components, in the electronic bay and flight deck (including the
instruments).
It uses air recirculated from the cabin, and extracts air from the different panels and equipments
racks.
MAIN COMPONENTS
Applicable to: ALL
TWO CABIN FANS
Two electric fans operate continuously, as long as the aircraft's electrical system is supplied.
These fans can be simultaneously cut off via the CABIN FAN pushbutton.
They make circulate the air around the avionics equipment, and blow to the mixer unit of the air
conditioning system through the recirculation valves.
RECIRCULATION VALVES
The recirculation valves are normally open, and are partially closed automatically by the ventilation
controller, when both packs are OFF (provided that both CABIN FANS are ON) to ensure sufficient
air flow to avionic.
EXTRACT FAN
The extract fan operates continuously, as long as the aircraft's electrical system is supplied, and it
blows air through the underfloor extract or overboard extract valve.
UNDERFLOOR AND OVERBOARD EXTRACT VALVES
These valves are fitted with actuators, controlled by the Avionics Equipment Ventilation Computer
(AEVC), or by the EXTRACT pushbutton from the flight deck.
Air is blown overboard through the overboard extract valve.
Through the underfloor extract valve, air is blown under the forward cargo compartment, then
overboard through the outflow valve.
COOLING EFFECT DETECTOR (CED)
This detector triggers an ECAM caution when the cooling capacity (flow and temperature) of the
blown air is abnormal. On ground, it also activates the external horn and the external warning light.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 2/6
FCOM 19 AUG 10
AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC)
This Computer controls the position of the underfloor and OVBD extract valves.
SCHEMATICS
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 3/6
　
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