High pressure air is tapped from the compressor section of the engines. The compressor is before any fuel is introduced, so this is pure clean air. It is still very hot, though, just due to the heating as a result of compression.
This air is run through an air cycle machine, which is basically a mechanical air conditioner, to cool it and regulate the temperature of the cabin. The conditioned air is then ducted into the cabin.
The pressurization is controlled by a regulator which opens and closes a valve called the outflow valve. If the outflow valve is closed, the pressure in the cabin will increase. If the valve is open, the pressure will decrease. In all reality, the regulator continuously and automatically repositions the outflow valve to keep the cabin pressure at the selected value.
This air is run through an air cycle machine, which is basically a mechanical air conditioner, to cool it and regulate the temperature of the cabin. The conditioned air is then ducted into the cabin.
The pressurization is controlled by a regulator which opens and closes a valve called the outflow valve. If the outflow valve is closed, the pressure in the cabin will increase. If the valve is open, the pressure will decrease. In all reality, the regulator continuously and automatically repositions the outflow valve to keep the cabin pressure at the selected value.
Any aircraft certified to operate above FL250 must have an approved pressurization system. The Aircraft is a sealed tube that hold its pressure. At FL370, the air is too thin for passengers where oxygen and pressure at a comfortable rate is produced, for example an 8 PSI defferential. So most time the cabin will be around 8000-10,000 feet cabin pressure altitude.
This pressurization is produced by bleed Air from the engines that cool and pressurize the air into the cabin. It is also moderated by an outflow valve at the rear of the aircraft outside. On the ground the outflow valvue must be fully open to relief the cabin of excess air so the doors can be open safely. If any of the systems should fail the consiquencies may be fatal. Where the pilots and passenger could suffercate slowly, or explosive or rapid decompression calls for an emergency Descent.
This pressurization is produced by bleed Air from the engines that cool and pressurize the air into the cabin. It is also moderated by an outflow valve at the rear of the aircraft outside. On the ground the outflow valvue must be fully open to relief the cabin of excess air so the doors can be open safely. If any of the systems should fail the consiquencies may be fatal. Where the pilots and passenger could suffercate slowly, or explosive or rapid decompression calls for an emergency Descent.
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