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Sorry I don’t quite understand by what you’re saying “when sequence coming to an end”—could you elaborate more (and give an example perhaps?)
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Transition is used when an aircraft is approaching your airspace but do not have intention to land (they may ask to land though, so bear that in mind!). Your airspace is 5nm and 5,000ft AAL (above aerodrome level). Essentially, a transition altitude allows pilots to safely travel in your airspace. For more info, read it here: Assigning a Transition Altitude 😉