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pushbuttons on the AIR panel. In the absence of electrical supply, the hot air valves are closed. In
the absence of air pressure, a spring keeps the valve closed.
The valve closes automatically, if the duct overheats.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
A330/A340 FLEET DSC-21-10-20 P 5/6
FCOM 19 AUG 10
TRIM AIR VALVES
Applicable to: ALL
These valves are electrically-controlled by the zone controller. Trim air valves, associated with each
zone, adjust the temperature by adding hot air from the two hot air manifolds.
For the cockpit supply, only one trim air valve is fitted to regulate air from the hot air manifold 2. Air
from the hot air manifold 1 passes through a restrictor.
HOT AIR X VALVE
Applicable to: ALL
A HOT AIR X valve is fitted between the two hot air manifolds. The valve is normally closed. It
automatically opens, if one hot air supply fails.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
Intentionally left blank
A330/A340 FLEET DSC-21-10-20 P 6/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A330/A340 FLEET DSC-21-10-30 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Temperature regulation is automatic and controlled by one zone controller and two pack controllers.
PACK CONTROLLER
Applicable to:
Each pack controller regulates the temperature of its associated pack, in accordance with a demand
signal from the zone controller, by modulating the bypass valve, the ram air inlet flaps and the ram air
outlet flaps.
The ram air inlet and outlet flaps close during takeoff and landing to avoid ingestion of foreign
objects.
Note: During takeoff, the ram air inlet and outlet flaps close when the thrust lever is at or above
CL, and the wheel speed (sent by the BSCU) is at or above 70 kt.
During landing, they close as soon as the landing gear is compressed, and the speed is at
or above 70 kt.
They open, when the speed is below 70 kt, with a 15 s delay.
The pack controllers also provide flow regulation by modulating the associated pack flow control
valve, in accordance with the zone controller demand.
PACK CONTROLLER
Applicable to: ,
Each pack controller regulates the temperature of its associated pack, in accordance with a demand
signal from the zone controller, by modulating the temperature control valve and the ram air inlet
flaps and the ram air outlet flaps.
The ram air inlet and outlet flaps close during takeoff and landing to avoid ingestion of foreign
objects.
Note: During takeoff, the ram air inlet and outlet flaps close when the thrust lever is at or above
CL, and the wheel speed (sent by the BSCU) is at or above 70 kt.
During landing, they close as soon as the landing gear is compressed, and the speed is at
or above 70 kt.
They open, when the speed is below 70 kt, with a 15 s delay.
The pack controllers also provide flow regulation by modulating the associated pack flow control
valve, in accordance with the zone controller demand.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A330/A340 FLEET DSC-21-10-30 P 2/4
FCOM 19 AUG 10
ZONE CONTROLLER
Applicable to: ALL
PACK FLOW CONTROL
The crew can use the PACK FLOW selector to adjust the pack flow for the number of passengers
and the external conditions.
Whatever the crew selects, the system receives a high flow demand for any of the following
circumstances :
Single pack operation, or‐
When the APU is supplying bleed air.‐
Note: Due to ambient conditions, high flow may not be achieved.
If the crew selects LO flow and the temperature demand cannot be satisfied, the zone controller
generates an ECAM advisory message to inform the crew to manually select NORM flow.
ENGINE PRESSURE DEMAND
When the cooling demand in one zone cannot be satisfied, if the bleed pressure is too low, the
zone controller sends a pressure demand signal to both engines' Engine Interface Units (EIU),
in order to increase the minimum idle and to raise the bleed pressure.
APU FLOW DEMAND
When the APU bleed valve is open, the zone controller signals the APU Electronic Control Box
(ECB) to increase the APU flow output when any zone temperature demand cannot be satisfied.
BLEED TEMPERATURE DEMAND
If the cooling demand cannot be satisfied, the zone controller signals the Bleed Monitoring
　
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