HDOT Airports - Airspace 10 Foot Contours

The requirements for filing with the FAA for proposed construction or alteration of existing structures vary based on several factors such as height, proximity to an airport, location, and frequencies emitted from the structure, etc. For more details, please refer to 14 CFR Part 77.9. The airspace contours are given in feet above mean sea level at a given point.

The Part 77 Surfaces may vary significantly throughout a proposed project site boundary. Therefore, a thorough evaluation of the Part 77 Surfaces over the entire project site should be conducted to ensure all proposed buildings/structures are within allowable height limits. The ground elevation at a proposed site must be determined and subtracted from the airspace contour value to determine the maximum height of a building/structure at a given point at ground level.

Regardless if the proposed construction or alteration of existing structure is below the Part 77 Surfaces, developers are still required to file a FAA Form 7460-1 to obtain FAA’s official determination at the HDOT and/or FAA’s request. A copy of FAA’s determination letter should be forwarded to the HDOT Airports Planning Section. For additional information, please refer to metadata at files.hawaii.gov/dbedt/op/gis/data/HDOTA_AirportAirspaceContours.pdf or contact the Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, Hi. 96804; (808) 587-2846; email: gis@hawaii.gov ; Website: planning.hawaii.gov/gis .