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In September 2022, the C919 large passenger aircraft completed all airworthiness certification work and obtained the model certificate issued by the Civil Aviation Administration of China, and will be delivered to the first aircraft by the end of 2022. The successful development of the C919 large passenger aircraft and the acquisition of the model certificate marks my country's ability to independently develop world-class large passenger aircraft, and is an important milestone in the development of my country's large aircraft industry.
Beijing News reporter Tao Ran photographed by
C919 full name COMAC C919, C is taken from the first letter of China (China) and COMAC (COMAC). The first "9" means eternal life, while "19" means this large passenger plane has a maximum passenger capacity of 190 seats. When the "heavy weapon of a great power" C919 takes off, this large aircraft made in China will also "rush" into the international civil aviation passenger aircraft manufacturing market. Large passenger aircraft are considered the jewel in the crown of modern industry. The C919 large passenger aircraft was launched in 2007 and flew for the first time in 2017. During the development process, it has conquered more than 100 technologies including integrated aircraft engine design, control laws of fly-by-wire flight control system, active control technology, and refined finite element model analysis of the entire aircraft. Excluding the onboard system, only the sections and components of the large aircraft themselves, if they are all disassembled into parts, there are a total of about 1 million small parts.
Wang Yanan, editor-in-chief of " Aviation Knowledge " magazine, said that the C919 uses advanced body, airfoil design, and has a large bypass ratio turbofan engine with superior performance. In terms of pilot control, the C919 uses a very friendly human-computer interaction interface to make the pilot more comfortable to control. In terms of cabin environment construction, C919 has also put in a lot of effort to achieve the goal of making passengers more comfortable to ride, and the noise reduction design of cabin noise reaches international standards. The reporter noticed that the advanced airfoil design of C919 has always attracted much attention. Its biggest highlight is that China's first independent design of the supercritical wing reached the world's advanced level. Supercritical wings are wings with special wing profiles (wing shapes). Compared with traditional wings, supercritical wings can increase the aircraft's cruising aerodynamic efficiency by more than 20%, thereby increasing its cruising speed by more than 100 kilometers per hour. The first aircraft of
C919 will be delivered by the end of 2022, and the pace of commercial operations is accelerating. On March 1 last year, China Eastern Airlines, as the world's first launcher of the domestic large aircraft C919, officially signed a C919 large passenger aircraft purchase contract with COMAC in Shanghai, introducing the first batch of 5 aircraft, and , China Eastern Airlines became the world's first airline to operate C919 large passenger aircraft. According to the preliminary arrangements of China Eastern Airlines, after the introduction of five aircraft, Shanghai will be used as the main base to encrypt routes such as Shanghai to Beijing Daxing, Guangzhou, Shenzhen, Chengdu, Xiamen , Wuhan, Qingdao and other routes. As of now, C919 has received orders from 815 aircraft from 28 customers including China Eastern Airlines, HNA, Air China, China Southern Airlines , Sichuan Airlines , Hebei Airlines , etc. Read the full text
Beijing News reporter Tao Ran Photo by
model certificate of conformity to C919? What other "certificates" do large aircraft need to obtain in the future? In the five years since its maiden flight, what "exams" have the six test flights of C919 participated in? Beijing News reporter interviewed Zhou Jisheng, former deputy chief designer of COMAC ARJ21, and sorted out the relevant nodes.
Zhou Jisheng introduced that the model certificate of conformity (TC) is the first airworthiness certificate that C919 needs to obtain. The primary prerequisite for transport aircraft to obtain commercial operation qualification is to prove that the safety design of the aircraft meets the requirements of China's Civil Aviation CCAR25 (Airworthiness Standard for Transport aircraft). CCAR25 stipulates the minimum requirements for the safety design of transport aircraft. Aircraft applying for certification must complete a series of compliance verifications in accordance with this requirement in order to obtain a model certificate. There are 10 compliance verification methods, and flight test verification (forensic test flight) is one of them.
Zhou Jisheng said that after obtaining the model certificate (TC), C919 also needs to obtain a production license (PC), which is a necessary condition for mass production. In addition, each mass-produced aircraft must also hold a stand-alone certificate of conformity (AC).The reporter learned that compared with aircraft model certification, production license certification can better reflect the production organization and control, quality management and comprehensive management level of an aviation manufacturing enterprise. From raw material control, supplier management , to the division and control of production links, production quality control, to aircraft factory testing, after-sales maintenance, etc., every detail must be traceable and well-documented to ensure that from small parts to large machines, they can be traced and safely controlled. Production license certification collection is an important link in the project from successful development to mass production, and is a necessary prerequisite for achieving commercial success.
public information shows that in five years, the large aircraft has successively completed ground tests such as 2.5g extreme load static test, power plant, fuel and inert system, power supply system, environmental control system, etc., test flights for subjects such as flutter , airspeed calibration, load, stability and performance, long-distance air transition flight, flight thrust determination test flight, etc. According to a previous report by " China Civil Aviation Daily ", after the first flight of C919 is successful, a test flight of 729 subjects must be carried out before the test flight and evidence collection task can be completed.
free throw is sure to kill! Chinese women's basketball team , in the unfavorable situation of the absence of the main outside Li Meng , defeated the Australian team 61-59 and advanced to the World Cup finals. They will face off against the United States tomorrow and will launch an attack on the first World Cup championship in team history.
today encountered the Australian team in the World Cup semi-finals. The young Chinese women's basketball team has a slight advantage in overall strength and game momentum, while the opponent has the advantage of home court. Before the game, due to the intensive schedule and continuous high-intensity competition, Li Meng, who performed well in this World Cup, suddenly fell ill. After listening to the advice of the team doctor, the coaching staff decided to use Li Meng with reservations.
From the entire competition process, it is similar to the plot of the Chinese women's basketball team relying on free throws to win the final in the group stage of the Tokyo Olympics. This semi-final also had twists and turns. In the key second half, the lagging Australian team launched a strong counterattack and continuously narrowed the score gap. The girls of women's basketball withstood the pressure and finally laughed to the end. After eliminating the Australian team and advancing to the finals, the Chinese women's basketball team has tied the best results in the history of the World Cup and will launch an attack on the first World Cup championship in the team's history tomorrow. Read the full text
htmlOn September 26, the latest US missile destroyer Zumwalter arrived at Yokosuka Military Port in Japan and began its first deployment outside the United States. On the same day, US Vice President Harris also flew to Japan to attend the state funeral of former Japanese Prime Minister Shinzo Abe. This is certainly no coincidence.For the overseas deployment of Zumwalter, US media reported that it aims to create conditions for the United States to eventually deploy the hypersonic missile in the Western Pacific region. The ship has been assigned to the 15th Destroyer Squadron of the US Seventh Fleet. The Yokosuka Military Port, which is stationed in Japan, is the largest overseas base of the US Navy in the world and is also the home port of the USS Reagan aircraft carrier.
For this reason, Japanese media reported that Yokosuka has become the most important base of the US military in the world. On September 28, Harris arrived at Yokosuka Military Port and boarded the destroyer Howard, which was moored by the Zumwalter, and delivered a speech that encouraged the morale of the US military "front-front deployment" and reiterated his expectations for the US military's military alliance. This seems to confirm the Japanese media's advocacy that "Yoksuka has become the most important base of the US military in the world."
It is worth mentioning that Zumwalter and Harris are not all the recent visits to Yokosuka by the US politician: from September 12 to 14, Major General Jabron, the commander of the US Pacific Fleet Submarine Force, also arrived here and met with the senior management of the Japanese Maritime Self-Defense Force
and the US submarine force in Japan.It can be said that the United States has carried out intensive "air-ground and submarine warfare" promotion in a short period of time, highlighting the importance of the port in the United States globally, especially the Far East and the so-called "Indo-Pacific" strategy chessboard. Although the Japanese hawks were inexplicably excited by the US military and political leaders to "save" Yokosuka, many American military experts have questions about whether Yokosuka is suitable for the "frontier" of the US Far East military strategy. Read the full textOn some social media platforms, "relatives" have become a hot topic again. These topics have one thing in common, they all regard "relatives" as a negative existence, although it is full of prejudice.
In fact, at least 10 years ago, some online platforms had discussion groups related to "relatives", attracting a large number of netizens to participate in the discussion, and many complaints were made. Of course, everyone complained anonymously, and no one would send an open letter to their relatives. This also makes people suspect that these people who complain about relatives online may be good kids in reality. They did not dare to have conflicts with relatives in person, so they secretly vented on the Internet. Ten years have passed, and the media has changed, from text-based to video-based, and topics like "relatives" are still enthusiastic. This shows that the current "new generation" is still facing the old problem: the younger generation is walking out of the original family and social relationships and building their own new world in a new environment, which is also a process of recreating interpersonal relationships.
"Relatives" are always associated with their hometown and tradition. In the 1990s, they were mainly rural areas, and in the past 10 years, they have been small cities. They are essentially a blood relationship. They are destined from the moment you are born, and you cannot choose or deny it. In the long traditional society, "relatives" are not only relationships, but also a solid community of interests. Only by mutual support between relatives can we maintain competitiveness in the agricultural society. Every year during the Spring Festival travel rush, people carry large and small bags from a "family land" to celebrate the New Year, and go for a brief date with relatives - it is also likely to be a confrontation. This is actually the process of "social relations" moving towards "modernization".
people are always emotional animals. A person often has more contact with relatives in his childhood, and has already been "embedded" with each other without realizing it. How easy is it to completely separate? When people complain about the inconsistent views of the family group, often tearing or even blocking each other, they actually show a certain recognition of the family group. Therefore, we are willing to continue to stay in the family group, and even if we don’t speak, we will not quit the group easily. The existence of this kind of family and relative group seems to indicate that we are not completely "modern" in social relations, but this may not be a bad thing. After all, although some people say that relatives are "not good" anymore, we cannot really live alone in this world. Therefore, giving warmth to strangers and distance to relatives is not easy, but it is also a psychological connection that is worth our serious attempt. Read the full text
Edit Wei Yue Design Jia Chenchen Proofreading Li Lijun
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