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?


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.

  • $\begingroup$ One or the other document is out of date I suppose.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

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.