题目内容
We can execute a ____ if the visibility is below the minimums required to execute a safe landing.
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It also allows instrument approaches to be made procedurally at airports where air traffic control does not use ____or in the case of ____ failure.
When aircraft are under radar control, air traffic controllers may replace some or all of these phases of the approach with radar____.
It is very common for air traffic controllers to vector aircraft to the final approach ____, e.g. the ILS.
Many ____ approaches allow for landing in conditions of low visibility.
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