Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:4:p6
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 4 (pt 6/11)
Character Range: 256831–259629

the aerodrome operator must ensure that the OLS within the aerodrome boundary is maintained clear of obstacles.

Note   If third parties propose to erect structures likely to infringe the OLS outside the aerodrome boundary, it is in the interests of aerodrome operators to liaise as soon as possible with the proponents and the relevant planning authorities, with a view to ensuring the preservation of the OLS and limiting the introduction of new obstacles.

7.04 Reference elevation datum

        A reference elevation datum must be:

(a) established for the horizontal and conical surfaces of the OLS; and

(b) if the elevation of the ARP is within 3 m of the average elevations of all existing and proposed runway ends — the same elevation as the ARP (rounded down to the nearest half metre); and

(c) if paragraph (b) does not apply — the average elevation of existing and proposed runway ends (rounded down to the nearest half metre).

Note   The reference elevation datum is not to be confused with the aerodrome elevation published in the AIP‑ERSA. Aerodrome elevation is, by definition, the highest point on the landing area.

7.05 Outer horizontal surface of the OLS

        The outer horizontal surface of the OLS must consist of a plane located 150 m above the reference elevation datum and extending from the upper edge of the extended conical surface, for a radial distance of 15 000 m from the ARP.

Note   For guidance only, Figure 7.07-1 shows the relationship between the outer horizontal, the conical, the inner horizontal, and the transitional surfaces.

7.06 Conical surface

       (1) The conical surface of the OLS must consist of straight and curved elements which slope upwards and outwards from the edge of the inner horizontal surface to the relevant height specified in Table 7.15 (1) above the inner horizontal surface.

Note   For guidance only, see Figure 7.07-1.

       (2) The slope of the conical surface must be measured in a vertical plane perpendicular to the periphery of the inner horizontal surface.

       (3) If an outer horizontal surface is present and the end of the conical surface does not terminate directly into the commencement of the outer horizontal surface, the conical surface must then continue outwards on the same plane perpendicular to the periphery of the inner horizontal surface until it reaches the commencement of the outer horizontal surface.

7.07 Inner horizontal surface

        The inner horizontal surface must be a horizontal plane, at the height specified in Table 7.15 (1) above 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