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pressure regulating valve. This valve then remains closed until the flight crew resets the system by
pressing the HOT AIR pushbutton — which it cannot do until the temperature drops below 70 °C.
FORWARD CARGO COMPARTMENT HEATING
Applicable to:
,
,
MSN,,
4538,,
The ventilation system for the forward cargo compartment uses hot engine bleed air, which is also
used for cockpit and cabin temperature control, mixing it with the ambient cabin air that flows through
the cargo compartment.
The cockpit and cabin hot air pressure regulating valve regulates the pressure of this hot air supply,
and the cargo trim air valve, which is modulated electrically by the controller, controls the flow.
The hot air mixes with air from the cabin as it supplied to the cargo compartment through the
ventilation inlet isolation valve.
The controller regulates the amount of hot air added by the trim air valve to get the desired
temperature, per the temperature selector.
If the inlet temperature exceeds 70 °C, the controller closes the trim air valve. If the inlet temperature
reaches 88 °C, the controller interprets this as a duct overhead and closes the pressure regulating
valve. This valve then remains closed until the flight crew resets the system by pressing the HOT AIR
pushbutton - which it cannot do until the temperature drops below 70 °C.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
CARGO - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-40-30 P 1/6
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(1) AFT ISOL VALVE pb
The switch controls the isolation valves and the extraction fan.
Auto : The inlet and outlet isolation valves open, blower and extraction fans run if there
is no smoke detected in the aft cargo bay.
OFF : The inlet and outlet isolation valves and the trim air valve close, the extraction fan
stops.
FAULT lt : The light, associated with the ECAM caution, comes on amber when either inlet
or outlet valve is not in the selected position.
(2) HOT AIR pb
Auto : The pressure regulating valve regulates the hot air pressure.
OFF : The presure regulating valves. The fault circuit is reset.
FAULT lt : The amber light and ECAM caution come on, when a duct overheat is detected
(88 °C – 190 °F).
The light goes out, when the temperature drops below 70 °C (158 °F), and OFF is
selected. Then, if the pushbutton is set to on, the system resets.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
CARGO - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-40-30 P 2/6
FCOM 19 AUG 10
(3) Temperature sel
‐ COLD
position
: Approximately 5 °C (41 °F)
‐ HOT
position
: Approximately 26 °C (79 °F)
‐ Middle
position
: Approximately 15 °C (59 °F)
Note: 1. The cargo compartment temperature may vary, depending on external factors
(flight duration, outside temperature...).
2. The actual bulk cargo compartment temperature may be 10 °C (18 °F) lower than
the selected temperature.
OVERHEAD PANEL
Applicable to: ,
, MSN,,,
4617,
(1) FWD ISOL VALVE pb
The switch controls the forward isolation valves and the extraction fan.
Auto : The inlet and outlet isolation valves open. The extraction fan runs when the
aircraft is on ground, or if ▵P ≤ 1 PSI in flight. If ▵P > 1 PSI, the fan stops. If
smoke is detected in the forward cargo bay, the valves close and the fan stops.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
CARGO - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-40-30 P 3/6
FCOM 19 AUG 10
OFF : The inlet and outlet isolation valves and the trim air valve close, the extraction fan
stops.
FAULT lt : The light, associated with the ECAM caution, comes on amber when either inlet
or outlet valve is not in the selected position.
(2) Temperature sel
‐ COLD
position
: Approximately 5 °C (41 °F)
‐ HOT
position
: Approximately 26 °C (79 °F)
‐ Middle
position
: Approximately 15 °C (59 °F)
Note: The cargo compartment temperature may vary, depending on external factors (flight
duration, outside temperature...).
OVERHEAD PANEL
Applicable to:
(1) FWD ISOL VALVE pb
The switch controls the forward isolation valves and the extraction fan.
Auto : The inlet and outlet isolation valves open. The extraction fan runs when the
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 1(28)
