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ON GROUND OPERATION
When the bulk cargo door is open, electrical power no longer supplies the heating element of
the fan heater. Compartment heating is unavailable, as long as cargo door remains open.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
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FCOM 19 AUG 10
FWD CARGO COMPARTMENT
Applicable to: ,
VENTILATION AND COOLING
Due to the extract fan suction, the cabin air flows through the inlet isolation valves into the forward
cargo compartment, via the sidewall and ceiling inlets. Air is extracted through outlets, on the
opposite sidewall, and goes via the extract fan and outlet isolation valve to the underfloor bilge
area near the forward outflow valve.
To decrease compartment temperature, the inlet ventilation air is mixed with cold air from Pack 2.
The cold air valve has three positions to adjust the quantity of cooled conditioned air that is mixed
with the ventilation air. The valve position is selected from the cockpit.
Note: 1. In general, if COOLING is selected at NORM or MAX, the parameters could be
different between both packs.
2. Below 20 000 ft , pack 2 outlet temperature is limited to 5 °C, in order to avoid ice
accumulation on the cold air valve.
NORMAL OPERATION
Operation starts automatically, when the isolation valves are fully open. To open the isolation
valves, the FWD ISOL VALVE pushbutton is set to ON. The extract fan starts to operate
continuously.
The controller closes the isolation valves and stops the extract fan, when :
a. The FWD ISOL VALVE pushbutton is switched OFF, or
b. The forward cargo smoke detection system is triggered, or
c. The DITCHING pushbutton on the CABIN PRESS panel is switched ON.
In case of an overheat, the extract fan stops, and the OVHT COND FANS RESET FAULT light,
on the maintenance panel, comes on.
The cold air valve will be fully closed, when :
The COOLING selector is set to OFF, or‐
The forward cargo door is not fully closed, or‐
The forward cargo smoke detection system is triggered, or‐
The forward cooling system fails, or‐
At least one pack is off.‐
HEATING
To provide variable temperature, inlet air is mixed with the hot air ducted upstream of PACK 1. The
forward cargo trim air valve controls the quantity of hot air added.
The temperature is selected from the cockpit.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
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FCOM 19 AUG 10
NORMAL OPERATION
When the HOT AIR 1 pushbutton (Refer to DSC-21-10-50 OVERHEAD PANEL) is switched
ON, hot air is added to the cargo ventilation system. A trim air valve controls the quantity of
hot air. The Ventilation Controller controls the position of this trim air valve, according to the
sensed duct temperature and to the selected temperature. Manually switching the HOT AIR 1
pushbutton to OFF stops the heating.
Note: If there is a failure in one of the hot air supplies, the hot air crossvalve opens. The
forward cargo compartment supply remains, either through Channel 1 (Channel 2
failure), or through Channel 2 (Channel 1 failure).
If the forward cargo compartment heating system is stopped via the HOT AIR 1 pushbutton,
temperature control for the respective cabin zones (Refer to DSC-21-10-50 OVERHEAD
PANEL) is also lost.
ON GROUND OPERATION
The trim air valve closes when the forward cargo door opens. Compartment heating is
unavailable, as long as the cargo door remains open.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
A330/A340 FLEET DSC-21-40-20 P 7/10
FCOM 19 AUG 10
SCHEMATIC
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
A330/A340 FLEET DSC-21-40-20 P 8/10
FCOM 19 AUG 10
SCHEMATIC
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
A330/A340 FLEET DSC-21-40-20 P 9/10
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
CARGO - SYSTEM OPERATION
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
　
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