Aviation news analysis
50 SKY SHADES - World aviation news

Why Do All Airplane Windows Have A Tiny Hole In Them?

Download: Printable PDF Date: 07 Aug 2016 15:13 category:
Publisher:
 Why Do All Airplane Windows Have A Tiny Hole In Them? - Airlines publisher
Krista Kuznecova
Aircraft: Airplanes
Source: Techworm

Having a hole anywhere on a plane seems a terrible idea, so why there is a tiny gap in the windows? The experts explain the crucial role they play

If you’ve ever stared out the window as your plane takes off, you will have seen a tiny hole in your window.

At first, it may seem like a weird addition, especially in something that’s carrying a lot of people at a great height, but they’re there for a very important reason: to stop the cabin from depressurizing.

Cruising at 10,600 meters (35,000 feet), the pressure is around 1.5 kilograms (3.3 pounds) per square inch. This is too low for the human body to stay conscious, so the pressure is artificially maintained at around 3.5 kilograms (8 pounds) per square inch. But of course, if you increase pressure inside, the structure has to be strong to hold the difference between the external pressure and internal pressure.

The difference between the two puts physical stress on the windows – made up of three panes of glass.

There’s a small air gap in between the middle and outer panes and the hole is actually in the middle pane.

If you ever wondered what it’s called – it’s a “breather” or “bleed hole – and it balances the pressure between the cabin and the air gap.

The outer pane takes the pressure, whereas the middle pane acts as a fail-safe just in case that trusty outer pane fails. Perish the thought.

The hole has another role though – releasing moisture from the gap preventing the little windows from fogging or frosting over.

So next time you see the tiny fracture like lines rather than a not so lovely cloudy window, you know why.



Loading comments for Why Do All Airplane Windows Have A Tiny Hole In Them?...


Recommended

RusJet to help market Sukhoi Business Jet

Russian aircraft manufacturer Sukhoi Civil Aircraft Co (SCAC) and RusJet Airlines have signed an agreement to jointly promote the Sukhoi Business Jet (SBJ), the VIP version of the SSJ100 regional airl...

Aviation History – CIDNA – East Arrow

Looking back to the beginning of 20 century, how fast was the air travel in your opinion? How interesting were destinations maps, what service packages existed? Visiting Bucharest Aurel Vlaicu...

Silk Way West Airlines increases flights to Chinese city of Zhengzhou

Azerbaijani cargo air carrier Silk Way West Airlines increases the number of flights to China. The number of Baku-Zhengzhou flights will be increased from four to six times a week. The appropria...

Luxaviation Helicopters owned Starspeed Ltd celebrates 40 years of successful helicopter operations

Starspeed Ltd., the oldest and most trusted corporate and VIP helicopter management, charter and training companies in Europe, part of Luxaviation Helicopters, celebrates 40 years of successful helico...