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not given on other drawings. This can be done by a note if the objects are located outside the limits of the drawing. (11) Airport reference point with latitude and longitude given based on U.S. Geological Survey grid system. (12) Elevation of runway ends, high and low points, and runway intersections. For ILS runways, changes in elevation within 3,000 feet of the threshold. (13) True azimuth of runways (measured from true north) . (14) North point —true and magnetic, with the magnetic declination. (15) Pertinent dimensional data —runway and taxiway widths and runway Lengths, taxiway -runway -apron clearances, apron dimensions, building clearance lines, clear zones, and parallel runway sepa- ration. (16) Use a 24" X 36" layout sheet. If neces- sary, increase the sheet size but maintain the same 1:11/2 ratio of sheet height to length. Include a map scale of approxi- mately 200 to 600 feet to the inch de- pending on the size of the airport, and illustrate this scale on the layout in graphic form. Also include a legend in graphic and descriptive form with sym- bols that differentiate between existing, proposed, immediate, and proposed fu- ture development. Provide space for the title, revision, and necessary approvals. The use of photo mosaics is encouraged. b. Location Map. This is a key map drawn to a scale sufficient to depict the airport, cities, rail- roads, major highways, and roads within 25 to 50 miles of the airport. c. Vicinity Map. This is a key map showing the relationship of an airport to the city or cities, nearby airports, roads, railroads, and built-up areas. It should be drawn to a scale of 1:24,000 (U.S.G.S. 7t/2 minute quad sheets). A vicinity map may be omitted if sufficient area is shown on the Approach and Clear Zone Layout. d. Basic Data Table. This table contains the following information on existing and ultimate con- ditions where applicable: (1) Airport elevation (highest point of the landing areas). (2) Runway identification such as 13/31 or 4/22. Percent effective runway gradient for each existing and proposed runway. Percent of wind coverage by principal runway, secondary runway, and combined coverage. Instrument Landing System (ILS) runway when designated, dominant runway other- wise, existing and proposed. (6) Normal or mean maximum daily tempera- ture of the hottest month. Pavement strength of each runway in gross weight and type of main gear (i.e., single, dual, and dual tandem, as appro- priate) . (8) Plan for obstruction removal, relocation of facilities, etc. e. Wind Information. A wind rose should be given with the runway orientation superimposed. Crosswind coverage and the source and period of data should also be given. This data may be on a separate sheet or sheets, especially if low visibility wind data are given. Wind information should be in terms of all-weather conditions, supplemented by IFR weather conditions where IFR operations are expected. Addi- tional wind information and sources for airport wind data are given in Item lu, Table 1. At locations where no satisfactory wind data exist, the basis for the wind analysis and runway alignment should be given in the airport layout plan report unless an ap- propriate note is included on the plan. f. Detail Required. The foregoing require- ments indicated that considerable detail should be included on the airport layout plan drawing. However, not all items need to be drawn if a note can adequately cover the development or facility under consideration. For example, standard taxiway Light- ing, runway and taxiway marking, and the taxiway sign system can be covered by a note in the basic data table. Where detailed planning has not been performed for areas reserved for future aviation or nonaviation development, an outline of these areas is generally adequate. 56. Approach and Clear Zone Layout. This plan should depict the following information: a. Areas under the imaginary surfaces as defined in FAR Part 77, Objects Affecting Navigable Air- space. (3) (4) (5) (7) 35