approach surfaces

Applicable to Article VI - Chapter 1 The "approach surfaces" are imaginary inclined planes, trapezoidal in shape and located symmetrically with respect to the extended center line of any runway. Such approach surfaces, extending from both ends of any runway, consist of contiguous inner and outer sections whose dimensions are as follows: (a) The plane of the inner section: (1) begins at a line drawn parallel to, and at the same elevation as, the end of the runway, and at a distance, measured horizontally along the extended runway centerline, of 200 feet from the end of the runway; (2) extends for a distance of 10,000 feet, measured horizontally along the extended runway centerline; (3) has a width of 1,000 feet measured along the line described in paragraph (a)(1) of this Section, which increases uniformly (with respect to the extended runway centerline) to a width of 4,000 feet at the outer edge of such inner section, as described in paragraph (a)(2) of this Section; and (4) rises at a slope of one foot in height for every 50 feet of horizontal distance. (b) The plane of the outer section: (1) begins at the outer edge of the inner section; (2) extends for a distance of 15,000 feet, measured horizontally along the extended runway centerline; (3) has a width of 4,000 feet commencing at the outer edge of the inner section, which increases uniformly (with respect to the extended runway center line) to a width of 8,500 feet at the outer edge of such outer section; and (4) rises at a slope of one foot in height for every 40 feet of horizontal distance. DESCRIPTION OF APPROACH SURFACE