例如，VFR飞行员进入C类空域所要做的就是与空中交通管制建立双向无线电联系。
For example, all a VFR pilot has to do to enter Class C airspace is establish two-way radio contact with ATC.
然而，这种纯粹的视觉系统在恶劣天气下毫无用处，到了20世纪30年代，无线电通信开始用于空中交通管制。
However, this purely visual system was useless in bad weather, and, by the 1930s, radio communication was coming into use for ATC.
在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。
In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.
下一代的空中交通管制系统将会在一个指定区域中使用全球定位系统和无线电应答器来警告所有飞机关于其他飞机的位置。那么这个系统能做到吗？
What about the next generation of air-traffic control systems that promise to use GPS satellites and radio transponders to warn all aircraft in a given area about the presence of others?
在驾驶舱内，飞行员在和巴西方面的空中交通管制部门交谈，报告航班高度和无线电频率。
In the cockpit, the pilots chattered with Brazilian air traffic control, calling out altitude and radio frequencies.
当这架波音757载着它的38名乘客和7名机组成员呼啸而过匹兹堡时，空中管制疯狂地通过无线电呼叫机组人员。
As the 757 and its 38 passengers and seven crew members blew past Pittsburgh, air-traffic controllers tried frantically to raise the crew via radio.
事故发生前十分钟空中交通管制失去了和飞机驾驶员的无线电联系。
Air traffic control lost radio contact with the pilot of the aircraft ten minutes before the accident.
机载设备包括无线电通信和导航用于学员飞行员获得航空管制和导航仪表的基本技能。
Onboard equipments include radio communications and navigation for the pupil pilot to gain the basic skills of flight control and navigation instruments.
他们不与飞机建立直接的无线电联络，而是同航空公司签派员、航路电台工作人员和机场管制员保持联系。
They had no direct radio link with aircraft but used telephones to stay in touch with airline dispatchers, airway radio operators, and airport traffic controllers.
在驾驶舱内，飞行员在和巴西的空中交通管制人员对话，报告着飞行高度和无线电频率。
In the cockpit, the pilots chattered with Brazilian air traffic control, calling out altitude and radio frequencies.
在驾驶舱内，飞行员在和巴西的空中交通管制人员对话，报告着飞行高度和无线电频率。
In the cockpit, the pilots chattered with Brazilian air traffic control, calling out altitude and radio frequencies.
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