<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区
          Make me your Homepage
          left corner left corner
          China Daily Website

          Maiden flight in holding pattern

          Updated: 2013-08-07 01:20
          By Wang Wen and Zhao Lei ( China Daily)

          Manufacturer pushes introduction of C919 large jetliner back one year

          China's dream of having its first large commercial jetliner may have hit some turbulence, as the maiden test flight of the C919 will be delayed by a year to 2015.

          Zhang Yanzhong, director of the program's advisory committee of experts and a member of the Chinese Academy of Engineering, said the program encountered difficulties due to the manufacturer's present level of technological expertise and experience building commercial aircraft, but that these are not major setbacks.

          "Generally speaking, the project is going well now," he said on Tuesday, without elaborating on what the issues are.

          Based on the project's progress, it is impossible to make the maiden test flight in 2014 as planned, said an official with the Commercial Aircraft Corp of China, builder of the C919.

          The first delivery of the C919, planned for 2016, may also be delayed, said the official, who is familiar with the project but declined to be identified.

          Wang Ya'nan, deputy editor-in-chief of Aerospace Knowledge magazine, said it will take at least two to three years for domestic and foreign authorities to authenticate the airworthiness of the C919.

          "The earliest time for its delivery to buyers is likely to be in 2018 or 2019," Wang said.

          Chinese airlines that placed orders for the jetliners said they will patiently wait for delivery.

          "Only one year delay is OK for us, as it will not have much adverse effect on the airline's operations," said an official from a domestic airline who did not want to be named.

          By the end of 2012, at least 15 companies, most of them Chinese, agreed to buy 380 of the aircraft.

          GE's aircraft leasing arm has signed on to take 20 of the C919 planes. Other customers include China's big three airlines — Air China, China Southern Airlines and China Eastern Airlines — and the leasing units of lenders such as Bank of China, Industrial and Commercial Bank of China, and Bank of Communications.

          Material and component suppliers of the aircraft have not been informed about the schedule changes.

          "We are still working on the projects in line with the original schedule," said Xu Yingbing, director of communications (Asia-Pacific) of Honeywell Aerospace.

          Honeywell Aerospace provides major systems including guidance systems and auxiliary power units for the C919.

          Honeywell International and CFM International, a venture between General Electric and Safran SA, are among the C919's major suppliers.

          The program's delay is not a total surprise, experts said.

          "I think the maiden flight of the C919 will be conducted in 2015, and it is quite natural that the date of the test flight is postponed," Wang said.

          Development and testing of a new aircraft, especially a large jetliner, go through very complicated processes, he said, noting that companies like Boeing and Airbus had also delayed test flights.

          Some of the postponements of Boeing and Airbus were caused by technical problems, but sometimes they were made out of commercial considerations, Wang said.

          For instance, the company knew that it would take five years to develop a new aircraft but still announced that the maiden flight would be performed within four, Wang said.

          "The reason they deliberately announced an early date was to grab the market," he said.

          China is building the 168-seat plane as it tries to break the stranglehold of Airbus SAS and Boeing in the global market for aircraft of this size. Last year, COMAC, builder of the C919, asked its project designers to work 12-hour days and six-day weeks to meet the deadline for the maiden flight.

          The C919 is not China's first attempt to build a large plane. From the early 1970s to the mid-1980s, China worked on the four-engine, narrow-body Y-10, but the project was eventually aborted after doubts over the aircraft's profitability and feasibility, although three prototypes had been manufactured.

          "The C919 is hence the first, so it is logical that China may take a longer time to develop it," Wang said.

          The biggest obstacle developers have to overcome is the propulsion system, he said.

          "In addition, whether the test flight can be performed on schedule depends on the results of ground tests, which examine the performance of every system on the plane."

          COMAC has started the parts and components manufacturing of C919, and it is working on the research of some key technologies, according to the company.

          Contact the writers at wangwen@chinadaily.com.cn and zhaolei@chinadaily.com.cn

          Bloomberg contributed to this story.

           
          ...
          ...
          ...
          主站蜘蛛池模板: 亚洲第一狼人区在线观看| 亚洲人成网站18禁止无码| 亚洲永久视频| 精品人妻系列无码天堂| 亚洲欧美日韩色图| 欧美日韩中文亚洲另类春色| 欧美xxxxhd高清| 精品嫩模福利一区二区蜜臀 | 国产熟女高潮一区二区三区| 国产一区二区三区av在线无码观看| 少妇办公室好紧好爽再浪一点| 国产成人综合久久精品下载| 国产精品国产高清国产av| 日韩av一区免费播放| 五月激情综合网| 男女猛烈激情xx00免费视频 | 色熟妇人妻久久中文字幕| 福利一区二区在线播放| 国产青榴视频在线观看| 国产一级r片内射免费视频 | 亚洲鸥美日韩精品久久| 久久精品国产精品亚洲| 成人午夜免费无码视频在线观看| 1000部啪啪未满十八勿入下载| 欧美黑人性暴力猛交喷水| аⅴ天堂中文在线网| 久久中文字幕国产精品| 狠狠婷婷色五月中文字幕| 在线日韩一区二区| 青青草原亚洲| 国产成人免费一区二区三区| 亚洲国产一成人久久精品| 无码囯产精品一区二区免费| 国产精品白嫩初高生免费视频| 非会员区试看120秒6次| 亚洲女人αV天堂在线| 人人做人人妻人人精| 日韩幕无线码一区中文| 亚洲高清aⅴ日本欧美视频| 精品日韩av在线播放| 在线观看国产成人av天堂|