题目内容
词汇与结构In all cases, additional crew training is required for such approaches, and a certain number of low visibility approaches must either be performed or ____ in a set period of time for pilots to stay 'current' in performing them.
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词汇与结构When using ILS, the ____ of the signal must be protected, which requires that certain areas of the airport close to the installations being free of other aircraft and vehicles.
词汇与结构There must be bigger gaps between aircraft on ____ approach to both protect the ILS signal and to cope with slower runway vacation times.
词汇与结构In addition, the airport itself has special considerations for low ____ operations.
词汇与结构The airport itself has special considerations for low visibility operations including different lighting for approach, runways, and taxiways as well as the location of ____ equipment.
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