REVEALED: Here’s why there are holes in airplane windows


Whenever you take a flight, the chances are you don’t give a second thought ot the aircraft you’re flying on.

But have you ever sat there and wondered why you should put you’re phone in flight mode or why they dim the lights during take off?

And what about those tiny holes in airplane windows?

Photo by Mark Vanhoenacker

Photo by Mark Vanhoenacker

Having holes anywhere on an airplane seems like a pretty bad idea.

However, there is a good reason why there are holes in airplane windows.

According to Mark Vanhoenacker, a British Airways pilot who writes about aviation for Slate, the holes are designed to regular air pressure and prevent the cabin from depressuring.

As the plane increases altitude, the air pressure outside begins to drop, compared to the regulated air pressure inside the plane.

Photo by Mark Vanhoenacker

Photo by Mark Vanhoenacker

The difference in pressure puts stress on the plane’s windows, which are made from three separate planes of glass.

The first window pane is known as the scratch pane, while the middle pane is the one which includes the holes. The third pane is known as the outer pane.

There’s a small gap between the middle and outer pane and the holes, known as the “bleed hole” or “breather holes” help balance the pressure between the gap and the cabin.

This basically ensures that we don’t pass out while flying at 36,000ft.

The bleed hole also helps to release moisture, which prevents the windows from fogging.


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