Why during takeoff and landing must be open window shades?

According to the rules of safety, during taxi, takeoff and landing of aircraft window shades must be open. The fact that at these stages of air transport accounts for the largest number of accidents. Therefore, security must be given careful attention.

First, Your eyes need to get used to natural light, thanks to this You will be better able to see when a disaster occurs. You probably noticed that during takeoff/landing is also turned off and the main lighting in the cabin.



Second, flight attendants or even passengers can see what's going on behind. This will allow time to report an emergency situation the crew or to assess during the evacuation position behind. For example, to see the fire or not. Moreover, in case of an emergency landing through the portholes rescuers can see what is going on in the cabin.



Well, and thirdly, to ensure that passengers were not hurt. During hard landing the plastic curtain can crack and damage the face by shrapnel.

By the way, that will break the Windows themselves, can not survive. They consists of 2/x-3/layer glazing. The force, that is able to withstand differences in pressure, which are both glass at the same time. The portholes, which are designed so that they are able to withstand the pressure between the interior and the external atmosphere, comparable to the load up to 4 tons. Internal glass window, which is visible to the passengers in the cabin, is decorative in nature. Damage will not affect the safety in the plane.

Source: /users/413