AIR CONDITIONING -DISTRIBUTION -GENERAL DESCRIPTION
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AIR CONDITIONING -DISTRIBUTION -OPERATION
General
The cargo temperature select panel has the control for the bulk cargo ventilation system. The ventilation system uses the bulk cargo heat selector.
The air conditioning panel has these controls for distribution:
*
Equipment cooling control
*
Upper and lower recirculation fan controls
*
Air conditioning reset control.
Control of these ventilation systems are automatic and have no flight deck controls:
*
Galley chiller unit ventilation
*
Lavatory/galley ventilation (aft equipment cooling).
See the distribution -ventilation section for more information about the ventilation systems that do not have controls in the flight deck (SECTION 21-26).
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Bulk Cargo Ventilation Operation
The bulk cargo heat selector is a three position selector. The selector enables the bulk cargo heating and ventilation systems. The HIGH position enables the ventilation system. The LOW or OFF position sets the ventilation system off. See the aft and bulk cargo compartment heating section for more information about the bulk cargo heating system (SECTION 21-44). See the ventilation section for more information about the bulk cargo ventilation system (SECTION 21-26).
Equipment Cooling Operation
The equipment cooling switch sets the mode of operation for the forward equipment cooling system. The AUTO position on the switch shows that the system is set to automatic operation. The OVRD indication shows that the system is in the override mode of operation. See the equipment cooling section for more information about the operation of the forward equipment cooling system (SECTION 21-27).
Recirculation Fan Operation
The UPPER and LOWER RECIRC FANS switches are alternate-action switches. The ON indication on the switch shows the fan is set to automatic operation. When the ON indication does not show, the fan is off. See the recirculation section for more information about the recirculation fans (SECTION 21-25).
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AIR CONDITIONING -DISTRIBUTION -OPERATION
Air Conditioning Reset Operation
The AIR COND RESET switch is a momentary-action switch. This switch starts the system after a failure.
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AIR CONDITIONING -DISTRIBUTION -OPERATION
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AIR CONDITIONING -DISTRIBUTION -GROUND TESTS
General
These are the air conditioning distribution ground tests that show when you select ATA 21 Environmental Control System:
*
Chiller boost fan
*
Lavatory/galley ventilation fan.
The recirculation fan system ground test shows when you select ATA 21 Cabin Temperature Control System.
Chiller Boost Fan
This test makes sure that the chiller boost fan installation is correct.
The test takes approximately 1-2 minutes.
This test shows for these ground test types:
*
System test
*
LRU replacement test.
Lavatory/Galley Ventilation Fan
This test makes sure that these LRU installations are correct:
*
Left lavatory/galley ventilation fan
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Right lavatory/galley ventilation fan
*
Bulk cargo compartment ventilation fan.
During this test, there will be airflow from the lavatory/galley ventilation fans. The test takes 2 to 3 minutes.
This test shows for these ground test types:
*
System test
*
LRU replacement test.
Recirculation Fan System
This test makes sure that the cabin temperature controller can control these LRUs:
*
Forward upper recirculation fan
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Aft upper recirculation fan
*
Left lower recirculation fan
*
Right lower recirculation fan.
The electrical load management system P110 and P210 energize these fans. The test takes approximately 2-3 minutes.
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