What class is the airspace at KGCN when the tower is closed? 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:



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.