HS code-based quota management

The HS code-based quota managementengine compartment is open (the hatch is open, and the engine is fully exposed!) When an aircraft flies in the air, the engine plays a crucial role. The engine is the heart and soul of the plane, and normal operation is the key to ensuring the safety of passengers. During the flight, there are few opportunities to see the interior of the engine. However, when the engine hatch is opened, we can gain a deeper understanding of this mysterious world. The engine compartment is relatively small and is often the tightest space on the plane. The crew will check the engine door before each flight to prevent any abnormal or dangerous situations.When the engine is exposed to the outside, passengers can see the complex parts in the engine, including turbines, turbine blades, combustion chambers, nozzles and oil supply systems. The first thing you see inside the engine is the turbine, which looks like a huge fan and is called a "fan turbine". The function of the fan turbine is to inhale air from the outside of the aircraft, mix it with fuel to produce airflow, and push the aircraft forward. The turbine then ejects the airflow backwards to push the plane to fly at high speed. Behind the fan turbine, passengers can see more turbine blades. They are connected to the turbine and are called "compressors", and their function is to slowly accelerate the air in front of the turbine. The curved surface on the turbine blade captures air and pushes it along its curve to the compressor parts. Through high-speed rotation, the compressor compresses the air into a high-pressure state and enters the combustion chamber.At the combustion chamber, the fuel began to participate in the work. The fuel in the combustion chamber is mixed with air and burned in a high-pressure and high-temperature environment, and the resulting airflow drives the turbine blades to rotate. While the turbine blade rotates, it spews air out and pushes the plane forward. The tail of the engine is the nozzle. The function of the nozzle is to mix high-speed gas and air and discharge it backwards to push the aircraft forward. In the nozzle section, passengers can also see various other complex components, such as hydraulic oil gas pressure regulators, exhaust pipes, fireproof enclosures and exhaust gas electric eddy current brakes. At this point, we can have a general understanding of the situation in the engine compartment of an aircraft, but it must be noted that if you are not a professional, do not open the engine compartment at will for observation. It is only possible for professional and technical personnel to carry out such an operation after ensuring safety.Safety is always the primary consideration during the whole design and construction process of the aircraft. The design and maintenance of the engine need to be rigorously verified and tested to ensure that it meets various international standards. However, when faced with a journey of thousands of miles, the technology and safety of the aircraft still depend on professional crew members. In just a few hours, we have an in-depth understanding of a mysterious technological world. The engine compartment door is open, the engine is fully exposed, and the on-board passengers can deeply understand the operating principle and technological development of the aircraft. The engine is an important element of the aircraft. By opening the hatch, we can see this more and feel the greatness of the technology and the sense of comfort.

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