Items that can save passengers' lives

From an ax in the cockpit, a black triangle on a cabin wall or an anti-hijacking key, these often-overlooked items may help you survive if the plane goes down.

Hook on the wings : Most aircraft have small yellow hooks on the wings.They are used to fix the rope to help passengers move through the wing in case the plane lands on the water.If there is a lifeboat, this rope will keep them on the way to climb over the glass and get into the boat more easily.

Ax: According to US Federal Aviation Law, all aircraft drivers must have rescue axes.This is a fire extinguisher, used to split cladding or other areas of aircraft to put out a fire if there is a fire inside.

The handle on both sides of the emergency door: These door handles are essentially to ensure safety for the flight attendants in an emergency situation.When panic, passengers can rush out and push the steward down the slide to escape.The handle helps them cling to the door to continue to support visitors and control the situation.

Black triangle : Many aircraft have small black triangles mounted on cabin walls.They mark the position of the flight crew that can easily observe the wing of the aircraft if needed.When there is any doubt about the position of the sidewalks on the wing, the pilot can reach this triangle and look through the window to see the number on them.

Van Cooper: Out of the plane, Cooper valve is a device that ensures the aircraft's back ladder cannot be opened in the air.They were installed in 1972, after a name hijacker Cooper controlled a plane and skydiving disappeared in Oregon sky.Today, most airplanes do not have a later ladder.

Hole in the window: These seemingly ominous holes ensure that the outer glass will break first in case of a pressure-related problem.The cabin pressure is maintained at a level suitable for passengers.To keep this pressure, the structure of the aircraft and the window should be able to withstand the difference between inside and outside.Therefore, commercial aircraft doors usually have three layers, the middle layer, the outer layer and the inner layer (two layers of glass and one plastic layer).

The clear plastic layer prevents passengers from breaking the glass layer between and outside.The middle glass has a gap, followed by an empty space and the outer glass.This gap helps maintain the pressure difference and brings this force to the outer glass rather than the inner plastic layer.This makes it easier for observers to detect problems due to the main impact pressure on the outermost layer.If the pressure blows the outer layer, the middle layer can withstand enough for the plane to descend to a lower height.

Auxiliary energy equipment (APU): The main function of APU is to start the main engine of the aircraft.In addition, they also provide power to electrical systems and air conditioners in aircraft before takeoff and after landing.

Ashing: Smoking is banned on modern aircraft, but they still need ashtrays to be allowed to operate as prescribed.The reason for this is to prevent the situation of sneaking passengers smoking in the toilet.Ashtray is installed next to the toilet as a safe backup option.