- when the weather minimums are below basic VFR.
- when the associated control tower is in operation.
- when the associated Flight Service Station is in operation.
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Airspace at an airport with a part-time control tower is classified as Class D airspace only
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when the associated control tower is in operation.
(The airspace is class D when the tower is in operation but reverts to Class E when not. In some situations, the airspace can be a combination of E and G. Refer to “Class D: Definitions” video for more information.)