题目内容
Once installed, the equipment also has additional ____ requirements to ensure that it is fully capable of supporting reduced visibility operations.
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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.
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.
There must be bigger gaps between aircraft on ____ approach to both protect the ILS signal and to cope with slower runway vacation times.
In addition, the airport itself has special considerations for low ____ operations.
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