(2)
 Operation with Failures If the mixer flap actuator 20HB has a failure, the zone controller 8HK monitors the failure and keeps it in the nonvolatile memory.

R **ON A/C 401-499,
 B. Mixer Flap Actuator
 (1)
 Normal Operation When the PACK 1 and PACK 2 pushbutton switches or only the PACK 1 pushbutton switch is(are) 'on' the mixer flap actuator 20HB is in the open position. Thus air is supplied from the pack 1 mixer chamber to the cockpit. When the PACK 1 pushbutton switch is released (the OFF legend is on) the mixer flap actuator closes and the air is supplied from the pack 2 mixer chamber to the cockpit.

 (2)
 Operation with Failures If the mixer flap actuator 20HB has a failure, the ACSC 2 (57HH) monitors the failure and keeps it in the nonvolatile memory.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
 C. The PACK FLOW Selector Switch The PACK FLOW selector 5HB is a three position switch and is labeled LO, NORM and HI. It is installed on the AIR COND panel 30VU. This switch selects the amount of airflow through the flow control valves 11HB (8HB). In normal conditions the selector is selected to NORM. This gives 100 % of normal airflow. LO selects 80 % of normal airflow to the air conditioning packs and HI selects 120 % of normal airflow.
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R 
R  **ON A/C 301-399,
 C. The ECON FLOW Pushbutton Switch The ECON FLOW pushbutton switch 5HB has an ON and an off position. It is installed on the AIR COND panel 30VU. This switch selects the amount of airflow through the flow control valves 11HB (8HB). In normal conditions the pushbutton switch is switched to off. This gives 100 % of normal airflow. When the ECON FLOW pushbutton switch is switched to ON, the normal airflow to the air conditioning packs is reduced to 80%. 
R  **ON A/C 401-499, 
R R R R R R R R R  C. The PACK FLOW Selector Switch The PACK FLOW selector 5HB is a three position switch and is labeled LO, NORM and HI. It is installed on the AIR COND panel 30VU. This switch selects the amount of airflow through the flow control valves 23HB (24HB). In normal conditions the selector is selected to NORM. This gives 100 % of normal airflow. LO selects 80 % of normal airflow to the air conditioning packs and HI selects 120 % of normal airflow. 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 D. Pack 1 (2) Pushbutton Switches The PACK 1 (2) pushbutton switches 6HB (7HB) are located on the AIR COND panel 30VU. When a fault occurs the FAULT legend of the respective pack switch shows amber. When a pack system is not in operation the OFF legend of the respective pack switch shows white. The different selections of the PACK 1 (2) pushbutton switch are as follows: 

R 1EFF : ALL 1 21-51-00Page 61 1 1 Aug 01/05 1 1 1CES 1

 (1)
 Switch released:

 (a) The OFF legend in the switch shows white,
 -
the respective pack system is not in operation and its flow control valve is closed,

 -
the mixer flap is at position 'C' (connects the cockpit supply duct to the pack 1 mixer chamber), or position 'O' (connects the cockpit supply duct to the pack 2 mixer chamber). The mixer flap is at position 'O' when only the PACK 1 pushbutton switch is released.

 (2)
 Switch pushed in:

 (a)
 No legend/s shown,

 -
the respective pack system is on and its flow control valve opens automatically.

 -
the mixer flap is at position 'C' or position 'O'. The mixer flap is at position 'C' when only the PACK 1 pushbutton switch is pushed in or when both the PACK 1 and PACK 2 pushbutton switches are pushed in.

 (b)
 The FAULT legend in the switch shows amber. This indicates that in the respective pack system:

 -
a compressor temperature of more than 260 deg.C (500.00 deg.F) has occured or,

 -
a compressor temperature of between 230 deg.C (446.00 deg.F) and 260 deg.C (500.00 deg.F) has occured four times in one flight or,

 -
a pack discharge temperature of more than 95 deg.C (203.00

 deg.F) has occured. UL The switch must be switched off manually.

R **ON A/C 401-499,
 D. Pack 1 (2) Pushbutton Switches The PACK 1 (2) pushbutton switches 6HB (7HB) are located on the AIR COND panel 30VU. When a fault occurs the FAULT legend of the respective pack switch shows amber. When a pack system is not in operation the OFF legend of the respective pack switch shows white. The different selections of the PACK 1 (2) pushbutton switch are as follows:
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 (1)
　
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