题目内容
It is very common for air traffic controllers to vector aircraft to the final approach ____, e.g. the ILS.
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Many ____ approaches allow for landing in conditions of low visibility.
The design takes into consideration all of the additional safety requirements for operating an aircraft in close_______ to the ground.
Once installed, the equipment also has additional ____ requirements to ensure that it is fully capable of supporting reduced visibility operations.
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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