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I was wondering if someone could help me figure out how the airspace around the Grand Canyon National Park Airport (KGCN) works. The chart supplement here says:

AIRSPACE: CLASS D svc 1 Jun thru 30 Sep 1300–0300Z, 1 Oct thru 31 May 1400–0200Z other times CLASS G.

... but the Grand Canyon VFR chart here says:

See NOTAMs/Directory for Class D/E (sfc) eff hrs

The VFR sectional just shows a class D ring around the airport with a class E surface area extension to the southwest:

enter image description here

When the tower is not occupied, how is the airspace around KGCN arranged?

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It may be an error on the chart, it should be either Class D or Class G, but it depends...

If the ATIS reverts to ASOS when the tower is closed, the airspace can be Class E. If ATIS/ASOS is not available, then the airport has to be Class-G. I would stick with the chart supplement here:

June 1 through September 30th, the tower is manned from 1300Z to 0300Z and is Class D. October 1 through May 31 the tower is manned from 1400Z to 0200Z and is Class D. All other times it is Class G meaning they do not have ASOS available. (AWOS is available by phone).

So according to the chart supplement, if the tower is not occupied the airspace is Class G.

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  • $\begingroup$ One or the other document is out of date I suppose. $\endgroup$ – GdD Aug 6 '18 at 8:06
  • $\begingroup$ What is the error? I don't see anything that doesn't coincide. $\endgroup$ – TomMcW Aug 7 '18 at 18:53
  • $\begingroup$ @TomMcW The chart graphic says it will be either "D or E", and directs you to the supplement while the chart supplement says that it will be either D or G. $\endgroup$ – Ron Beyer Aug 7 '18 at 21:07
  • $\begingroup$ @RonBeyer I read it as saying that both the class D and E sfc areas are inactive after hours. They should both revert to G, at least below 700 feet. $\endgroup$ – TomMcW Aug 7 '18 at 21:17
  • $\begingroup$ I see where you're coming from now. It's the way they worded it. I don't think they intended to indicate that D reverts to E, but that both areas have effective hours $\endgroup$ – TomMcW Aug 7 '18 at 21:20

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