Why are there no parachutes on civil aviation planes?

There are many reasons why there are no parachutes on civil aviation planes:

1. Judging from the accident, it usually happens during take-off and landing. Even if the plane is not in the landing stage, the general accident is instantaneous. And the majority of passengers have no chance to escape.

2. Parachute operation requires professional training, which is impossible for ordinary people to complete.

3. From the extravehicular environment. Even for level-flying skydiving, the air pressure and temperature outside the cabin are unbearable for ordinary people according to the flight altitude of about 8000m meters for ordinary civil airliners. It is very likely that he was hypothermic just after leaving the cabin, or he was in a coma due to lack of oxygen. In addition, whether it can fall normally immediately and where it will end up is also very problematic.

Judging from the weight of the plane. An umbrella bag is at least 10kg, and it is very heavy. At present, each passenger is only allowed to carry about 5 kilograms of luggage. It is difficult to load these things into the cabin of an airplane.

The answer to the reading comprehension question

1: The underlined sentence plays a transitional role, and bears many aviation accidents above, leading to many such accidents below, but it can be controlled with a high success rate.

2. Can't delete, because "only" emphasizes the degree. It seems that "making it lighter" seems to be a small thing for pilots, but from another perspective, it reflects that no matter what happens, the plane will land safely and stick to the main idea of the article.

3: (1) indicates that the forced landing failed.

(2)

4. Give an example, such as "For example, Boeing 747 has four sets of hydraulic control systems, and three sets can be controlled normally if they are broken. Boeing 777 has two engines, only one of which can fly across the ocean. " The use of examples can explain the central argument of the article more effectively and make the article more convincing and theoretical basis.

I hope my answer can help you!