If there should be no holes at all to keep the pressure in the cabin, why there is a small hole in each window of the plane?
No need to be a flying machine for years why the aircraft cabin is pressurized to keep us from being sucked off the plane at an altitude of 11,000 meters above sea level.
However, if there should be no holes at all to keep the pressure in the cabin, why there is a small hole in each window of the plane?
According to Mark Vanhoenacket, British Airways pilot, a small hole in each window of the plane called “bleed hole”, and the position is located on the second glass layer between two layers of glass windows inside and out. If you notice, the window has three layers of glass.
The first window glass is referred to as the initial layer where fingerprints often we pollute surface. The middle layer window glass is a ‘bleed hole’ is located. Last window glass lining up the entire system, keeping the pressure difference from outside.
When we are in a plane that is about to fly into the sky to a height of 35,000 feet, the pressure will fall below 0.2 kilogram square centimeter. That means there are pressures that are so different between the aircraft cabin pressure that is outside the plane. The air in the plane wanted out of the cabin to redress the balance.
So, what is the use of a small hole in the window of the plane?
“Actually, the hole was to reduce the pressure in the central part of the window glass layer, so that only the outer layer are facing pressure during the flight,” said Marlowe Moncur, director of technology at GKN Aerospace.
Small hole turned out to take an important role in providing protection for passengers. Not only that, it also protects the passenger window of moisture due to temperature differences, which allows us to enjoy a view of the clouds outside the plane.
Source: National Geographic