日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

USEUROPEAFRICAASIA 中文雙語Fran?ais
World
Home / World / Americas

Boeing puts to test after fire on 787 Dreamliner

Agencies/China Daily | Updated: 2013-07-16 10:31

Boeing faces a public test of the carbon-composite technology used in its 787 Dreamliner following a fire aboard one of its planes at London's Heathrow airport.

British investigators said the Ethiopian Airline's lithium-ion batteries likely did not cause the fire on Friday, allaying fears about a return of the problem that grounded the Dreamliner for more than three months earlier this year, when one battery caught fire and another overheated.

But the visible scorching on the top rear of the fuselage of the 250-seat plane puts a major innovation of the 787 - its lightweight, carbon-plastic composite construction - under the spotlight.

The key question: Can the burned plane be fixed easily and at a reasonable cost?

While composites have been used in aerospace for decades, the 787 is the first commercial jetliner built mainly from carbon-plastic materials, whose weight savings, combined with new engines, are supposed to slash fuel costs by 20 percent and operating costs by 10 percent.

Boeing engineers also added a weight-saving electrical system that was sorely tested when its lithium-ion batteries overheated on two 787s in January. The system also suffered a fire in 2010 during the plane's test phase.

The two systems are supposed to put Boeing at least a decade ahead of its rivals in the way aircraft are designed, built and operated.

Now they are both being tested again at a time when the company is designing new planes and building up its factory production to fill a record book of orders.

Boeing declined to comment other than to say it is cooperating with the investigation of the fire.

Such extensive composite repairs have not previously been performed on an operating commercial plane. So the Ethiopian Airline fire is the first chance airlines, financiers and competitors will have to see a real example of how and at what cost the repair can be done.

Carbon-composite technology and repair have been in use much longer than lithium-ion batteries. Boeing and others have had carbon fiber in military planes, such as the B2 stealth bomber, for more than 25 years.

The 787's composite skin can be patched by grinding out the damaged section, applying fresh layers of fiber and resin and then curing with heat under vacuum pressure, according to a Boeing engineer with knowledge of the process.

The work can be done on site, and repair stations have been learning to make repairs to service the plane around the world.

Most Viewed in 24 Hours
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 亚洲天堂婷婷 | 国产精久久一区二区三区 | 超碰97免费在线 | 国产在线视频导航 | 国产精品高潮呻吟久久av野狼 | 一区二区三区久久 | 国产日韩欧美在线观看视频 | 四虎国产成人永久精品免费 | 国产91av在线播放 | 超碰.com | 免费观看中文字幕 | 久久久天堂 | 亚洲精品视频一区二区 | 天天爽视频 | 日本一区二区视频在线观看 | 中文字幕在线观看你懂的 | 国产在线探花 | 国产精品二区一区二区aⅴ污介绍 | 亚洲天堂91| 午夜激情视频在线观看 | 成人婷婷 | 成人影片在线免费观看 | 日日骚 | 国产剧情精品 | 免费在线一级片 | 国产精品一二三在线观看 | 四虎影视精品 | 樱花草www在线观看 糖心vlog免费在线观看 | 专业操老外 | 成人黄色免费观看 | 午夜特片网 | av一区二区三区四区 | 天天操天天射天天爽 | 欧美特级毛片 | 国产aa视频| 久久久久99| 高级毛片 | 看av在线 | 成年人黄网站 | 99re在线观看视频 | 免费在线观看视频 |