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12 Cards in this Set
- Front
- Back
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What are the 6 sub systems of air-con? |
Air con cooling packs, air distribution system, zone temperature control, equipment cooling and ventilation, heating systems, pressurization control system |
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What are the three control zones? |
Flight deck, fwd compartment, aft compartment |
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How much air does that recirculation system recover? |
50% |
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When selecting different temperatures for three zones, which one will the temperature control system meet? |
It will meet the lowest temperature of the three packs. Hot 'trim' air is added downstream of pack inlets to warm the other zones If required |
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What is the purpose of an air cycle system? |
Reduce temperature and pressure, remove moisture and control flow |
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What functions do the flow control and shutoff valve provide? |
Shutoff, two mode flow control, temp limiting (high flow only) |
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What signal does the temperature control system send is high flow mode? |
To reduce pack flow and perform temp limiting function |
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What what is the purpose of the Air cycle machine? |
Reduce pressure and temp of the conditioned air |
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What components are in the Air cycle machine? |
Centrifugal turbine that drives a compressor. Single shaft drives a axial flow fan. Supported by air bearings |
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How does the turbine remove heat? |
Uses the expansion principle to remove heat energy and pressure |
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What feature prevents icing downstream of the air cycle machine? |
Hot bypass air via the low limit valve or temperature control valve |
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The high flow mode is initiated by which conditions? |
Single system operation. Respective recirculation system not operating |
