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Because at high altitude the pressure is much lesser so logically they will decrease the pressure within the plane before it takes off but why doesn't the plane get crashed by the surface pressure?
And got the following answer:
Just to add to answers. Some airplanes do pre-pressurize on the ground. There is a micro switch on the power levers that will initialize this on the takeoff. The cabin will descend around 250 fpm during the takeoff roll to make the initial climb more comfortable. But, there should never be a negative pressure on the inside of the aircraft. Aircraft have relief valves on to prevent negative cabin pressure. This "descent" is caused by increased pressure in the cabin. 8000 feet is mentioned in pressurization because that is the number that is used for certification on transport category planes. A transport category plane cannot be certified to fly above a cabin altitude of 8000 feet. Usually this is how they get the max altitude limitation for an airplane. Like someone else said, you typically do not see a cabin of 8000 feet. This is because most planes do not fly at the max altitude.