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    Airlines’ three in-flight engine shutdowns spark probe in India

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    1.08 crore domestic passengers travelled in April, around 2 pc more than March: DGCA

    1.08 crore domestic passengers travelled in April, around 2 pc more than March: DGCA

    Jet Airways secures flying permit, says will gatecrash aviation party with Akasa air

    Jet Airways secures flying permit, says will gatecrash aviation party with Akasa air

    SpiceJet flights temporarily grounded at Delhi International Airport due to a delay in AAI’s daily payment

    SpiceJet flights temporarily grounded at Delhi International Airport due to a delay in AAI’s daily payment

    Noida airport: Rs 10 lakh per day fine if delayed, says UP minister

    Noida airport: Rs 10 lakh per day fine if delayed, says UP minister

    BLADE launches chopper services in Goa

    BLADE launches chopper services in Goa

    Airlines’ three in-flight engine shutdowns spark probe in India

    Airlines’ three in-flight engine shutdowns spark probe in India

    Vistara announces direct flights to Coimbatore from three metro cities

    Vistara announces direct flights to Coimbatore from three metro cities

    Air India A320neo plane makes emergency landing at Mumbai airport after engine shuts down

    Air India A320neo plane makes emergency landing at Mumbai airport after engine shuts down

    Jet Airways 2.0 gets airline licence; to resume flights by September

    Jet Airways 2.0 gets airline licence; to resume flights by September

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How Do Airplanes Get Fresh Air for the Cabin?

AME QUESTION PAPERbyAME QUESTION PAPER
May 7, 2022
in Blogs
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Airplane cabins don’t consist entirely of recycled air. Depending on the type of airplane, it may only recycle about half of this air. The other half consists of fresh air. Being that cabins are pressurized — and, therefore, sealed — you might be wondering how they get fresh air. Passengers can’t open windows to allow fresh air to enter the cabin. If there’s a breach in the cabin, such as an open window, the cabin will lose pressure. So, how do airplanes can get fresh air for the cabin?

The Basics of Airplane Cabin Air

Most airplanes get fresh air from their jet engines. Like automotive engines, the jet engines used in airplanes require air. They can’t burn fuel alone to generate power. Rather, they require a combination of fuel and air. When exposed to a spark, these two elements will combust, thereby generating power that propels the airplane through the air.

When air enters an airplane’s engines, it’s compressed. Some of this air then enters the engines’ combustion chambers where it’s burned. The air that doesn’t go into the combustion chambers, however, is routed to the airplane’s cabin. The compressed fresh air travels to the airplane’s air conditioning unit where it’s cooled, after which it’s released through the vents.

Why Airplanes Use a Mixture of Fresh and Recycled Air

As previously mentioned, airplanes use a mixture of both fresh and recycled air for the cabin. They need fresh air specifically to regulate humidity levels. Airplane cabins already have dry air with a low humidity level. Research shows that most airplane cabins have a relative humidity level of about 20%. In comparison, experts recommend maintaining a humidity level of about 40% to 50% in your home.

If they only used recycled air, airplanes would have even drier cabin air with a lower humidity level. The use of fresh air adds moisture vapor to the cabin, thereby raising its humidity level. Cabins still have dry air, but the air would be much drier if it consisted entirely of recycled air. The air outside of airplanes is more humid than the cabin air.

Secondly, the use of fresh air helps to minimize airborne pollutants. Germs can spread inside airplane cabins. Although they use filters, germs can still float through the cabin. Pumping fresh air into the cabin helps to reduce the transmission of germs and other pollutants. The old air is released and replaced with fresh air.

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