首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
In June 1956 a TWA Constellation collided with a United Air Lines DC-7 over the Grand Canyon in Arizona, killing all 128 people
In June 1956 a TWA Constellation collided with a United Air Lines DC-7 over the Grand Canyon in Arizona, killing all 128 people
admin
2022-04-20
47
问题
In June 1956 a TWA Constellation collided with a United Air Lines DC-7 over the Grand Canyon in Arizona, killing all 128 people on both aircraft. At the time it was the worst ever airline disaster. Struggling with outdated technology and a post-war boom in air travel, overworked air-traffic controllers failed to spot that the planes were on a collision course.
That crash led to the creation of a new body, which became the Federal Aviation Administration (FAA), in charge of running and modernizing the world’s biggest air-transport system. With that system again struggling to keep pace with demand, Donald Trump thinks it is time to privatize America’s air-traffic control service. This week the president outlined a plan to turn air-traffic control into a separate non-profit entity financed by user fees, instead of the present patchwork of taxes and grants. Shorn of its air-traffic responsibility, the FAA would become a safety body.
America’s air-traffic system is vast, consisting of 14000 controllers working in 476 airport-control towers that handle take-offs and landings, as well as in 21 "enroute" centres looking after flights along the nation’s airways. It has a good safety record, but elderly technology limits the number of flights that can be handled. This leads to delays and frustrated flyers. With passenger numbers set to grow from 800m a year to almost by 2026, the problem will only get worse.
Mr. Trump believes that, no longer mired in a federal bureaucracy, the air-traffic service will become more efficient and better able to invest in technology. Many countries, including Australia, Britain and Canada, have privatized air-traffic services or turned them into state-owned firms. Nav Canada, a non-profit firm that has long managed Canadian airspace, has costs per flight hour of $ 340 compared with the FAA’s $ 450.
Replacing old radar-based methods with accurate satellite navigation and better digital communications is a particular priority. Aircraft using satellite navigation can be safely spaced more closely together, which permits many more planes to be in the air at the same time. Digital systems also provide data links to control centres and to other planes by regularly broadcasting an aircraft’s identification sign, its position and course. This would allow "free routing", which means pilots can fly directly to a destination, rather than {ollow established airways, which often zigzag around.
The president’s proposal might even speed a move towards "virtual" control towers in low-rise buildings, which can replace towers physically located at airports. The virtual versions are fed live video from airfield cameras. Proponents argue that they are both safer and around 30% cheaper to operate. Virtual towers can look after more than one airport. One in Norway is set to supervise 32 airports, some of them in remote areas.
The European Union reckons such innovations will allow three times as many flights to be handled in the region and save airlines some $ lObn a year. It also, optimistically perhaps, predicts that on average aircraft will land within one minute of their scheduled arrival time. That would count as a miraculous improvement for anyone, let alone America’s weary airport warriors.
Mr. Trump, though, may struggle to get the proposal through Congress. A similar plan got stuck last year, despite being backed by most airlines and the air-traffic controllers’ union. At least the president can dodge the queues: Air Force One flights get special clearance.
选项
答案
F
解析
根据题干定位至第七段。该段第二句指出,它还预测航班降落实际时间与预定时间的偏差将平均控制在一分钟以内,由此可知,欧盟认为使用虚拟塔台后,航班将会非常准时。故答案选F。
转载请注明原文地址:https://kaotiyun.com/show/DLi4777K
0
考研英语二
相关试题推荐
Allthepeople______treatmentprotestedthatthemedicalfeewastoohightobeacceptable.
Accordingtothepassage,thefactthatyoungpeopleseemtobelosinginterestinscience______.Theword"disparity"(Paragr
Withtheriseofthewomen’smovementinthelate1960s,thepoliticalsignificanceofdressbecameincreasinglyexplicit.Rejec
TheUnitedStateshashistoricallyhadhigherratesofmarriagethanthoseofotherindustrializedcountries.Thecurrentannual
TheUnitedStateshashistoricallyhadhigherratesofmarriagethanthoseofotherindustrializedcountries.Thecurrentannual
RuthSimmonsjoinedGoldmanSachs’sboardasanoutsidedirectorinJanuary2000:ayearlatershebecamepresidentofBrownUni
Britain’sCabinetOfficereleasedasweepingreportonthecountry’sfoodpolicy,anddeterminedthatBritonsarewastingtoomu
RuthSimmonsjoinedGoldmanSachs’sboardasanoutsidedirectorinJanuary2000;ayearlatershebecamepresidentofBrownUni
随机试题
政策问题一般都能顺利地进入正式议程的模型是()
禁婚亲
风险应对计划制定过程的依据不包括()
金属与石材幕墙工程采用的密封胶应掌握的原则有()。
蒸汽状态污染物,指在常温常压下易挥发的物质,以蒸汽状态进入大气,下列属于蒸汽状态污染物的是( )。
当给定利率及终值时,取得终值的时间越长,该终值的现值就越低。( )
银行从业操守和法律的区别有()。
(2012年)关于市场细分的说法,错误的是()。
A、 B、 C、 D、 B每行图形中分割空间数递减,小图形种类及数量轮换变化。
工作中你难以和同事、上司相处,你该怎么办?
最新回复
(
0
)