Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:4:p7
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 4 (pt 7/11)
Character Range: 259392–262195

the reference elevation datum, and extending to an outer boundary comprising:

(a) in the case of an aerodrome with a single runway — semi-circular curves of a radius determined in accordance with Table 7.15 (1), centred on the middle of each of the runway strip ends and joined tangentially by straight lines on each side of the runway parallel to the runway centreline; and

(b) in the case of an aerodrome with multiple runways — curves of a specified radius, centred on the middle of each of the runway strip ends and joined by a tangential line as 2 curves intersect.

Note   For guidance only, see Figure 7.07-2.

     Figure 7.07-1   Relationship of outer horizontal, conical, inner horizontal and transitional surfaces, with an example obstacle (illustrates matters)

     Figure 7.07-2   Boundary of inner horizontal surface (illustrates matters)

7.08 Approach surface

       (1) The approach surface must be an inclined plane, or combination of planes, which originates from the inner edge associated with each runway threshold, with 2 sides originating at the ends of the inner edge.

       (2) The inner edge associated with each runway threshold must have a specified length, and be located horizontally and perpendicular to the runway centreline, at the relevant distance before the threshold, as specified in Table 7.15 (1).

       (3) The 2 sides must diverge uniformly from the extended centreline of the runway at the relevant rate, as specified in Table 7.15 (1).

       (4) The approach surface may be divided into 3 sections and ends at an outer edge that is located at the relevant overall distance from the inner edge, and parallel to the inner edge, as specified in Table 7.15 (1).

       (5) The elevation of the midpoint of the threshold must be the elevation of the inner edge.

       (6) The slope of each section of the approach surface must be as specified in Table 7.15 (1) measured in the vertical plane containing the centreline of the runway.

Note   For guidance only, see Figures 7.08 (6)-1 and 7.08 (6)-2 for the approach surface for an instrument approach runway, and a plane view of the approach surface.

     Figure 7.08 (6)-1   Approach surface for an instrument approach runway

     Figure 7.08 (6)-2   Plane view of approach surface

7.09 Transitional surface

       (1) The transitional surface:

(a) must be comprised of inclined planes that originate:

 (i) at the lower edge from the side of the runway strip; and

 (ii) at the side of the approach surface that is below the inner horizontal surface; and

(b) must finish where the upper edge is located in the plane of the inner horizontal surface.

Note   For guidance only, see Figure 7.08 (6)-1.

       (2) The transitional surface must slope upwards and outwards at a specified rate and