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Controlled Airspace
Control Zones (CTR)
A Control Zone (CTR) is controlled airspace around an aerodrome.
It is established where:
an aerodrome control service or approach control service is required; and
the amount and type of traffic requires controlled airspace.
A CTR:
starts at the surface and extends up to a specified altitude;
is normally Class C or Class D airspace;
requires an ATC clearance to enter when active; and
becomes Class G airspace when not active.
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