aircraft pressurization system

7/24/2019 Aircraft Pressurization System

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What is pressurize? What is

pressurization?

Pressurize means to increase the

pressure.

While, pressurization is the act ofincreasing the air pressure inside aspace (example: an aircraft cabin)


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Introduction

The higher the altitude, the loer the airpressure.

The loer air pressure ma!es it moredi"cult for human to breathe normall#.

This can cause se$eral di"culties to the

human bod# such as %&P'I, T*PP+- and +/'0P*+I'1 I/21+.


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Introduction

To o$ercome this problem, allcommercial airplanes must bepressurized.

This is because, pressurization of thecabin limits the fall of air pressureinside the cabin.

Thus, allos the airplane to cruise ataltitudes up to 34,444 feet ithoutexposing tra$elers to dangerousl# lole$els of air pressure.


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Wh# ircraft needs to be

5Pressurized6? The cabin pressurization s#stem in toda#7s

aircraft is designed topro$ide a safe andcomfortable cabin en$ironmentat cruising

altitudes that can reach upards of 34,444 feet. lso this s#stem is important to protect cres

8 passengers from the ph#siological ris!s ofhigh altitudessuch ash#poxia,

decompression sic!ness 8 trapped gas.

t higher altitude, the outside atmosphericpressure is $er# lo, thus gi$e di"culties toour bod# s#stem to function normall#.


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*is!s of unpressurized

aircraft %#poxia:

9ac!s of ox#gen /repassengers can loss their

consciousness. Trapped -as:

-ases trapped ithin the bodies (middleear, sinus, teeth)

/repassengers ma# su;er critical pain ecompression sic!ness:


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%o Pressurization Wor!s


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'utside air continuousl# enters enginehere it iscompressed b# the compressor.

The outside air gets $er# hot as it becomespressurized. This air =oing through ducting in the

ing. It is further cooled b# the main air conditioning

units inside the cabin.

The cooled air then =os to a mixing chamber.

Cooled outside airthen mixed ith re>circulatedairthat has been cleaned ith high e"cienc# lters.

The lters are similar to those used in critical ardsof hospitals.


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The combined outside air (@4A ) and ltered air(@4A ) is ducted to the cabin and distributed througho$erhead outlets.

Inside the cabin, the air =os in a circular pattern.

bout half of the air exiting the cabin is exhaustedfrom the airplane through an out=o $al$e.

The other half is dran b# fans through special ltersunder the cabin =oor to be ltered again.

The air=o is continuous and is used for maintaininga comfortable cabin temperature 8 pressure.


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The opening of out=o $al$e can becontrolled b# pilot in order to maintainthe suitable pressure.


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What happen to aircraft

ithout Pressurizations#stem? The failure of pressurization s#stem can

lead to aircraft accident.

There are man# accidents occurred dueto this reason.

Bor example, %elios ira# Blight @CCPlane /rash.

This accident also !non as 1o 'x#genisaster


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Helios Airway Flight 522

No Oxygen Disaster


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%elios ira# Blight @CC

1o 'x#gen isaster o;, cre failed to correctl#

set pressurization s#stem.

This cause, all cres and passengers onboard su;ering %#poxia. s pilot also su;ering h#poxia, he

became unconscious and failed toperform emergenc# landing.

s a results, aircraft =# b# its on andnall# crashed due to lac! of fuel. llDCD on board ere !illed.


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Bailure of pressurization

s#stem Bailure of pressurization s#stem also can

cause b# an# damage to the aircraft thatcauses a brea! in the aircraft structure hich

enabling cabin air to escape outside theaircraft.

This situation causes a rapid reduction of airpressure inside the cabin thus aircraft loss of

cabin pressurization.

aircraft pressurization system

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