The Holes In Your Window Are For Your Protection.

Ever been sitting in an airplane waiting for your flight to take off? Eventually, your eyes probably wandered over to the window where the action is a bit more lively. Then you notice a tiny hole in the bottom of the airplane's window. If you have been wondering what it is for and whether it is supposed to contain screws, this will explain why airplane windows have those little holes, and why they don't need screws. Read on for information that you can use on your next flight if someone next to you asks about those 'extra' window holes. That little hole is actually considered a safety feature on the plane. Each hole in each window acts as a pressure regulator inside the cabin of the aircraft. Called a breather hole, it works like a bleed valve. A bleed valve is a valve or design which relieves or expels air from something, IE hoses and pipes, or in this case your airplane window. This is a good thing to have.
Patented by Daimlerchrysler Aerospace Airbus back in 1997, the reason the holes appear on planes is so that the correct atmospheric pressure can be attained inside the window panes. In case you didn't notice, each window actually has two panes.
What happens during flight is that the cabin becomes pressurized, which is one of the things we want on an airline journey. Using an outflow valve, the pressurized air is kept inside the cabin. There are sensors at work around the cabin. The window hole is designed to slowly release built-up air at a steady rate so that the pressure stays within certain levels. When the plane is sitting on the ground, the hole or valve is open. After takeoff, the valve starts to close.
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