Lead
The plane door is so bulky, why do you have to open it manually by the flight attendant?
In fact, every detail is a decision made after careful consideration.
The purpose of the aircraft door not being able to open and close automatically is to strengthen safety awareness and ensure aviation safety.
Why does the flight attendant have to face the opposite direction of the plane when the plane lands?
How did the flight attendant push open and close the plane door tightly while not missing the plane landing?
Let's find out today.
Are airplane doors so heavy?
Whether the aircraft door is opened or closed, there are flight attendants to help, and their body's resistance to the door is 100KG, which can prevent the impact of 235KG wind speed on the door.
The weight of the door of the aircraft is 70KG, and the door of the high-end model is about 100KG.
The cabin door of the Type 740 Boeing is also not a small volume, with a height of 108 centimeters, a length of 165 centimeters, and a width of 137 centimeters.
However, the weight of our common household cabinets and door panels has reached 80KG, and if you want to install the door frame and door leaf, the weight will be at least 50kg, compared to the weight of the aircraft door, which is not so "behemoth".
More than 100 pounds of door panels are placed at home, and everyone believes that no one can move them at will, but on the plane, the flight attendant can open and close the plane door with the smooth movement of the aircraft.
Why do flight attendants manually open and close the aircraft door?
There are many class groups on the plane, the average passenger is the Y class, the business class passenger is the J class, and the aircraft and staff are the main managers in the cabin C.
However, the C-level permissions are also very large, encompassing a wider range of permissions than the J-level and Y-level permissions.
The job responsibilities of flight attendants are very extensive, not only the simple work of serving passengers, they also need to have a certain degree of flexibility and adaptability, their first duty is to keep a cool head in an emergency, and lead other flight attendants to complete urgent work tasks.
The shape of the aircraft seems to be bulky, but the weight that can fly in the air is not heavy, and the flight attendant can push open the door panel of the aircraft, and the performance of the bulky in the shape does not necessarily clearly reflect the weight and size of the aircraft door membrane.
Both the 737 and 757 series aircraft will have a "CAUTION" sign on the door, which is also a warning that flight attendants must be cautious when operating.
Why should a flight attendant face the opposite direction of the plane?
When the door of the plane is opened, there will be a large amount of air gushing out, and when the plane takes off, the flight attendant is used to stand in the direction of the plane and push the door open.
So why does the flight attendant have to face the opposite direction of the plane when the plane lands?
Because the airplane pressure will push the door towards the outside of the plane, so the flight attendants are easily injured, so they will all stand outside, push the door open, and immediately stand on the other side of the door to welcome the passengers off the plane.
Let's talk about why there is so much air pressure in the door of the plane, and if you look closely at the shape of the aircraft, you will find that the shape of the aircraft is rounded, which should also reflect how "atmospheric" the shape of the aircraft is.
The air and pressure in the cabin are higher than the air outside the aircraft, so that when the door is opened, the airflow will gush out to the outside of the aircraft, which can also well alleviate the difference in pressure between the inside and outside of the aircraft, so that the occupants can be safer when disembarking.
The structure of the aircraft door locking system.
The cabin door on the plane can be reached through the cabin toilet, but don't look at the size of the aircraft toilet is not much larger than the general home bathroom, but the space layout inside is colorful, it is a large mobile three-dimensional puzzle.
Every position of the aircraft is laid out to save space, including the aircraft toilets, so the flight attendants have a lot of hard work when cleaning the toilets on the plane.
Different from ordinary puzzles, in the bathroom on the plane, each connecting rod is so closely connected, and the sophisticated system organically organizes every small component together.
Let's take a look at how the little hands of the flight attendant operate this mobile puzzle.
In addition to the mechanical lock, there is also an anti-stamping lock protection system on the lock of this puzzle, and how does this system work?
When the aircraft lands, the protective door of the anti-ramming system will automatically open, so that the flight attendant can avoid standing in the position of the protective door of the aircraft, but it can allow her to operate the protective door better.
The protective doors are fixed together by screws, and if the parts are disassembled, the door of the aircraft will not be opened, and it will also have a certain impact on the safety of the aircraft.
Therefore, the protective door has a unified controller, through which the protective door can be closed, and then inserted into the controller, the protective door can slide the buckle lock.
The outside of the protective door is a lever, through which the protective door can be made to slide the buckle lock, but in an emergency, if there is no lever, then the flight attendants can only control the sliding of the protective door through the dashboard, and the dashboard is only authorized by the pilot.
Of course, when the plane lands, the protective door will be automatically opened, but during the landing process, the protective door also has a certain spring buffering effect, so there will be a part of the air pressure will remain in the protective door, so the flight attendant must be very careful when handling this protective door.
Epilogue.
Good design, only after careful consideration will make such a structure, the aircraft door can not be automatically opened and closed is to strengthen the safety awareness of flight attendants, which is also to be able to better ensure aviation safety.
The flight attendant stands in the opposite direction of the landing of the aircraft, not only can adjust the air pressure, but also use the force of one side to drive the action of the other side when there is an emergency impulse, which is more convenient and fast.
Facing this heavy door, the soft hands of the flight attendants can skillfully operate in an emergency, which is a skill that has accumulated over the years, and they will definitely continue to move forward.