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is fully automatic. The operation for both compartments
is similar so we will only look at the forward cargo
compartment initially.
Ambient air from the cabin area enters the cargo
compartment via an inlet isolation valve.
Inlet Isolation
Valve
Inlet Isolation
Valve
FWD
Cabin
Ambient Air
MENU
AIR CONDITIONING Cargo System Pres. 3/17
FWD
The air is removed from the compartment either by
an extractor fan, or by differential pressure. The air
is discharged overboard via an outlet isolation
valve.
EExxtrtraacctotorrfafann Outlet Isolation
Valve
Outlet Isolation
Valve
Overboard
Cabin
Ambient Air
MENU
AIR CONDITIONING Cargo System Pres. 4/17
FWD
The operation of the two isolation valves and the
extraction fan is controlled automatically by a cargo
ventilation controller.
Cargo Ventilation
Controller
Overboard
Cabin
Ambient Air
MENU
AIR CONDITIONING Cargo System Pres. 5/17
FWD
To provide heating of the cargo compartment, hot bleed
air is supplied via a trim air valve. The operation of the
cargo trim air system is very similar to the trim air system
for the air conditioning system.
Overboard
Cabin
Ambient Air HOT BLEED AIR
Trim Air
Valve
Trim Air
Valve
MENU
AIR CONDITIONING Cargo System Pres. 6/17
FWD
Each cargo compartment has a Cargo Heating Controller
which controls the trim air valve position to regulate the
temperature of the compartment.
Let’s look at the ECAM COND page to see how information
on the Cargo conditioning system is presented to the
pilots.
Overboard
Cabin
Ambient Air HOT BLEED AIR
Cargo Heating
Controller
MENU
AIR CONDITIONING Cargo System Pres. 7/17
The Cargo heating system is an extension of the Air
conditioning system. Hot air is routed from the trim air
system, for the Forward cargo hold, and via an
independent Hot Air valve for the Aft cargo hold.
MENU
AIR CONDITIONING MENU Cargo System Pres. 8/17
AIR CONDITIONING MENU Cargo System Pres. 9/17
AIR CONDITIONING MENU Cargo System Pres. 10/17
AIR CONDITIONING MENU Cargo System Pres. 11/17
AIR CONDITIONING Cargo System Pres. 12/17
On the ECAM COND page the indications associated with
the cargo compartments are;
• the isolation valves
• the trim air valves
• duct inlet temperature
• compartment temperature
• aft cargo hot air valve
Notice that there are no indications for the extractor fans.
MENU
AIR CONDITIONING Cargo System Pres. 13/17
On the Overhead Panel there is a CARGO HEAT panel
that contains the controls associated with cargo heating
and conditioning.
MENU
AIR CONDITIONING Cargo System Pres. 14/17
For each cargo compartment there is an ISOLATION
VALVE pb sw. These pb sws normally remain in their
“lights out” auto position. When in this position the cargo
ventilation controller will automatically open and close the
isolation valves.
Aft
Cargo Ventilation
Controller
Forward
Cargo Ventilation
Controller
MENU
AIR CONDITIONING Cargo System Pres. 15/17
The temperature selectors send demand signals to the
associated cargo heat controllers. The cargo heat
controllers then move the trim air valves to adjust the
temperature of the air entering the compartment.
Aft
Cargo Heating
Controller
Forward
Cargo Heating
Controller
MENU
AIR CONDITIONING Cargo System Pres. 16/17
The HOT AIR pb sw controls the aft cargo compartment
hot air valve via the aft cargo heating controller. This pb
sw normally remain in the “lights out” auto position.
Notice that the forward cargo compartment does not have
an independent hot air valve. The forward cargo trim air
system is fed from the cabin hot air valve.
Aft
Cargo Heating
Controller
MENU
AIR CONDITIONING Cargo System Pres. 17/17
For normal operation of the cargo conditioning system the
only pilot inputs required are:
• to confirm that the pb sws are in their normal “lights out”
position
• to set the required temperatures.
Note that the mid position of the temperature selector is
approximately 16 degrees C (60 degrees F).
The abnormal operation of the system is very similar to
those already seen in the Air Conditioning abnormal
modules.
MENU NEXT
Module
completed
AIR CONDITIONING MENU Cargo System Pres. 18/17
　
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