In times of danger, it is an important life-saving tool for passengers. When an aircraft encounters an emergency, such as an emergency landing on the sea or a lake for some reason, passengers on the aircraft must wear life jackets and float on the water, waiting for the arrival of rescue ships or personnel.

According to Article 193 of the "China Civil Aviation Flight Rules", when a land aircraft flies over the sea 25 kilometers away from the coast, it must carry life jackets and lifeboats for all personnel on board; long-distance sea flights When flying, you should also carry necessary life-saving equipment (desalination agent, food, fishing gear, medicine, emergency radio, etc.).

Therefore, modern civil aviation aircraft, whether international or domestic airline flights, are equipped with a set of life jackets under each seat. When needed, just sit down and bend down to grab it.

The life jackets equipped on airplanes are generally special equipment designed for one-time use when they are not needed. It cannot be taken out and inflated at will.