946. How does the Pressurisation System work? In most modern aeroplanes, the aircraft engine compresses the outside air for the purpose of propulsion. A part of hot compressed air, before it is mixed with the fuel, is 'bled' into the cabin - but only after it is cooled appropriately to a comfortable temperature, from the aircraft engine. The air from the aircraft engine is routed through air cyclic machines, or 'packs' which Condition the air for temperature and humidity and then pumped into the cabin.

How does the Pressurisation System work?

In most modern aeroplanes, the aircraft engine compresses the outside air for the purpose of propulsion. A part of hot compressed air, before it is mixed with the fuel, is 'bled' into the cabin - but only after it is cooled appropriately to a comfortable temperature, from the aircraft engine. The air from the aircraft engine is routed through air cyclic machines, or  'packs' which Condition the air for temperature and humidity and then pumped into the cabin.