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depresses the microswitch actuator. A signal is sent
to the cargo ventilation controller which stops the
extract fan. When the pressure decreases, the
microswitch returns to original position, this removes
the pressure signal and the extract fan starts.
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FWD CARGO COMPARTMENT VENTILATION/HEATING - COMPONENTS - PRESSURE SWITCH
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FWD CARGO COMPARTMENT VENTILATION/HEATING - COMPONENTS
TRIM AIR VALVE
IDENTIFICATION
FIN: 2HC
LOCATION
ZONE: 137
COMPONENT DESCRIPTION
- a stepper motor drives the shaft of the
butterfly,
- limit switches stop the valve (mechanical stops
are as back up),
- a manual override and visual position
indicator,
- a return spring closes the trim air valve
if power supply is lost or if the
controller does not operate.
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FWD CARGO COMPARTMENT VENTILATION/HEATING - COMPONENTS
TEMPERATURE SENSORS
IDENTIFICATION
FIN: 3HC, 4HC
LOCATION
ZONE: 131, 132
COMPONENT DESCRIPTION
The two temperature sensors are used for temperature
control, indication and overheat detection.
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21 - AIR CONDITIONING
21-43-00 AFT CARGO COMPARTMENT
VENTILATION/HEATING -
SYSTEM PRESENTATION
CONTENTS:
Pressure Regulating Valve (PRV)
Trim Air Valve
Inlet Isolation Valve
Extraction Fan
Outlet Isolation Valve
Ventilation Controller
Heating Controller
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AFT CARGO COMPARTMENT VENTILATION/HEATING - SYSTEM PRESENTATION
PRESSURE REGULATING VALVE
The hot air is tapped from the bleed air duct and
pressure regulated by the cargo HOT AIR Pressure
Regulating Valve above the cabin pressure.
The cargo HOT AIR Pressure Regulating Valve regulates
the HOT AIR pressure (4 psi above the cabin pressure)
going to the Trim Air Valve.
TRIM AIR VALVE
The trim air valve regulates the hot air flow, the hot
air is then mixed with the cabin ambient air to obtain
the desired temperature.
INLET ISOLATION VALVE
The inlet isolation valve permits the air which has
been mixed to enter into the aft cargo compartment.
EXTRACTION FAN
The suction of the air is caused by the extraction fan
when it is running.
The extract fan runs only if both isolation valves are
open.
OUTLET ISOLATION VALVE
The outlet isolation valve permits the aft cargo
compartment air to be discharged in the area of the
outflow valve.
VENTILATION CONTROLLER
The cargo ventilation system part is controlled by the
ventilation controller.
The cargo ventilation controller controls the
isolation valves and the extract fan. In normal
operation they are open and the fan runs continuously
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