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The chart supplement for KUGN here says "AIRSPACE: CLASS D SVC 1200-0200Z other times CLASS E."

Does that mean that when the tower is closed, the class D airspace switches to class E surface area entirely, or is there class G from the surface up to 1200', and class E from 1200 up to 18000'?

KUGN

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SVC means Service, not Surface, that would be SFC. 1200-0200Z is a time range, that means the zone is class D between 12:00 UTC (that's what the Z or Zulu time means) and 0200Z, which would translate to 07:00-21:00 local daylight savings time in Waukegan. Basically, the tower is open during those times and then it closes so it becomes a class E zone, traffic would presumably use unicom if the airport is still open.

The zone is not defined in the sheet, you'd have to look at a chart to get the details on size, shape and how high it goes.

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  • $\begingroup$ Yep, SVC means "service", but that still begs the question if it is class G or E airspace beginning from the surface of the ground at the airport. $\endgroup$ – slantalpha Jul 22 '18 at 8:21
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    $\begingroup$ It depends on where you are in the zone @jeff0000, many zones have tiers, for example an airport's zone could be sfc to 3000ft around the airport, then 5nm away it is 1500ft to 3000ft. So if you're talking at the airport then it's class E from the surface, otherwise you need to look at a chart. $\endgroup$ – GdD Jul 22 '18 at 8:29

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