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INVENTORY OF EXISTING CONDITIONS although some types of aircraft and their fuel/passenger capacity are limited due to the runway’s shorter length. Aircraft take off and land into the wind to maximize performance. During winter months in Eugene, the winds are usually from the south, thus aircraft predominantly use Runways 16R and 16L. During the summer time, when winds are typically from the north, aircraft predominantly use Runways 34L and 34R. Part 77 Objects Affecting Navigable Airspace Airspace surrounding the Mahlon Sweet Field should be kept clear to the furthest extent possible. Title 14 Code of Federal Regulations (CFR) Part 77, Objects Affecting Navigable Airspace keeps essential airspace free and clear of obstructions that could be hazardous to aircraft on an approach or departure from the airport. For an object to be deemed an obstruction, it must penetrate one of the five sections of Part 77 airspace surfaces. The five sections of Part 77 airspace are broken out into the following surfaces: Primary Surface, Approach Surface, Transitional Surface, Horizontal Surface, and Conical Surface. A description of each surface along with their dimensions are listed below: »Primary Surface – This surface is centered on the runway, extending 200 feet beyond the edge of the runway. The width of the surface is dependent upon the approach to the runway. With the exception of Runway 34R, the width of the primary surface is 1,000 feet. Runway 34R has a primary surface width of 500 feet. »Approach Surface - This surface is a sloped plane that begins at the edge of the Primary Surface and extends horizontal in the shape of trapezoid. The slope, horizontal length, and the width of the surface are dependent upon the approach to the runway. Runway 16L and 16R are precision instrument runways with an approach surface length of 50,000 feet and a width at the end of the surface of 16,000 feet. The first 10,000 feet of the approach surface has a slope of 50:1, the remaining 40,000 feet has a slope of 40:1. Runway 34L and 34R are non-precision instrument runways with an approach surface length of 10,000 feet and a width at the end of surface of 3,500 feet for Runway 34R and 4,000 feet for Runway 34L. Both runways have an approach slope of 34:1. »Transitional Surface – This surface is a plane sloped at 7:1 from the primary surface and approach surfaces. The surface terminates when it intersects with the horizontal surface. »Horizontal Surface – This surface is a horizontal plane 150 feet above the airport elevation. The geometry of the surface is created by arcs centered on the edge of the primary surface with defined radii and then connected by tangents. The radius of the horizontal surface, based on the approaches at Mahlon Sweet Field, is 10,000 feet. »Conical Surface – This surface is a plane sloped at 20:1 extending upward from the periphery of the horizontal surface for 4,000 feet. A graphical sectional view of CFR 14 Part 77 imaginary surfaces is shown in Figure 1-8. A detailed illustration of the Part 77 surfaces which includes a three dimensional graphic, is shown in Chapter 6, Airport Layout Plan. EUGENE AIRPORT MASTER PLAN 1-18