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On May 5, 2017, China's first C919, a large-size jet passenger aircraft with completely independent intellectual property rights, rushed into the sky at Shanghai Pudong Airport and successfully completed its first flight mission. 

The production of C919 aircraft  part had adopt the metal 3D printing technology, 

the C919 test flight success also marks the metal 3D printing technology in the aerospace field has achieved a major breakthrough in the practical application.

3D printing technology can quickly produce complex structural components that can be applied to every part of aerospace, from the aircraft's doorknobs to wings, body joints and even engine core components.

Some parts and components are optimized for lightweight structure, and then directly produced using 3D printing technology, fuel consumption and emissions can be greatly reduced.
At present, there are many practical cases:
The United States SpaceX equipped eight SuperDraco engines for its Dragon V2 spacecraft, and its chamber was completely printed using Inconel alloys.
Each engine can provide 73,000 Newton (16,000 pounds force) thrust, allowing the spacecraft to land slowly and vertically.

GE's first 3D printed commercial jet engine parts have been certified by the Federal Aviation Administration (FAA).
This fist-sized compressor inlet temperature sensor T25 is manufactured by GE Aviation and will be used to retrofit 400 Boeing 777 GE90-94B jet engines.
This is the first time that 3D printed parts have passed the formal commercial standards certification.
The LEAP-1C jet engine with a 3D printed metal nozzle developed by CFM in China's C919 medium-sized passenger aircraft has been approved by the Federal Aviation Administration (FAA) and European Aviation Safety Association (EASA) and can be officially opened.

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