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 Air Supply Regulation
 Figure 003A

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 Air Supply Regulation 
R  Figure 003B 
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 Air Supply Regulation 
R  Figure 003C 
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 NOTE : The LO position can be selected for fuel economy purpose.
____
 This position must only be selected when there is a reduced number

 of passengers in the cabin,
 -the HI position, which sets the flow control valve to 120% of the normal airflow.
 NOTE : This position is selected in abnormal hot ambient conditions or to
____
 clear smoke.

 The PACK FLOW selector switch transmits the selected switch position to
 the Zone Controller (ZC). The ZC calculates the necessary flow demand and
 transmits the data to the pack controllers. They set the flow control
 valves in the necessary reference position.

 The PACK 1 and/or the PACK 2 pushbutton switches control the related pack
 flow control valve to the open or closed position.
 The flow control valves close automatically if:

 -
there is an engine start,

 -
there is an ENGINE FIRE pushbutton switch released,

 -
there is a compressor overheat,

 -
there is low bleed pressure,

 -
the DITCHING pushbutton switch 13HL is in the on position,

 -
the applicable PACK 1 or PACK 2 pushbutton switch is in the off
 position.

 B. Pressure Sensor (Flow Sensor) The pressure sensors 10HB (9HB) measure the difference between a flow control valve reference pressure and the ambient pressure. They transmit signals to the two pack controllers 7HH (27HH). The pack controllers use these signals for calculation of the pack flow.
 C. Ozone Filters The ozone filters 100HM (101HM) are installed upstream of the flow control valves. They catalytically remove the ozone from the hot bleed air before it flows to the air conditioning packs or the trim system.
 D. Mixer Flap Actuator The mixer flap actuator 20HB operates a flap in the cockpit supply port of the mixer. The flap connects the cockpit supply duct to the pack 1 mixer chamber, when both packs are in operation. When pack 1 is switched off, the flap changes the position and connects the cockpit supply duct to the pack 2 mixer chamber. This function makes sure of:
 -a good flow separation during pack 2 operation,
 -the supply of a sufficient fresh air quantity to the cockpit with pack 1 off.
R 1EFF : 001-049, 101-105, 151-199, 1 21-51-00Page 20 1 1 Aug 01/05 1 1 1CES 1 When the flap in the mixer unit enters the airflow it causes a small airflow diversion into the cockpit duct. This results in an adequate supply of conditioned air to the cockpit.

R **ON A/C 051-099, 106-149, 201-299,
 A. Flow Control Valve The flow control valves 11HB (8HB) are installed upstream of the air conditioning packs 10HM (11HM). The flow control valves control the quantity of air supplied from the pneumatic system to the air conditioning packs. They control the airflow fully pneumatically depending on the flow demand and the bleed pressure. The airflow through the flow control valves is selected by the PACK 1 and/or the PACK 2 pushbutton switches. The percentage of airflow from the flow control valves is selected by the PACK FLOW selector 5HB. The PACK FLOW selector, which is located on the AIR COND panel 30VU, has three positions:
 -
the NORM position, which sets the flow control valve to 100% of the normal airflow,

 -
the LO position, which sets the flow control valve to 80% of the normal airflow.

 NOTE : The LO position can be selected for fuel economy purpose.
____ This position must only be selected when there is a reduced number of passengers in the cabin,
 -the HI position, which sets the flow control valve to 120% of the normal airflow.
 NOTE : This position is selected in abnormal hot ambient conditions or to
____
 clear smoke.

 The PACK FLOW selector transmits the selected position to the Zone Controller (ZC). The ZC calculates the necessary flow demand and transmits the data to the pack controllers. They set the flow control valves in the necessary reference position. The PACK 1 and/or the PACK 2 pushbutton switches control the related pack flow control valve to the open or closed position. The flow control valves close automatically if:
　
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