Airport Height Zones

The Airport Height Zones are not zoning districts (although they are codified in the zoning regulation - AMC 21.06.030D.10.)  

They contours shown on the zoning maps that are mandated by Part 77 of the Federal Airway Regulations to provide a safe approach path to the Anchorage International Airport, Merrill Field, Birchwood, and Girdwood airports.

The contours give the maximum elevation above mean sea level (MSL) allowed for structures, including radio antennas.  Plot plans for building and land use permits within Airport Height Zones may be required to show elevations referenced to mean sea level to verify that structures don't encroach vertically into the airport approaches.