CS ADR-DSN.J.475 Non-precision approach runways

(a)The following obstacle limitation surfaces should be established for a non-precision approach runway:

(1)conical surface;

(2)inner horizontal surface;

(3)approach surface; and

(4)transitional surfaces.

(b)The heights and slopes of the surfaces should not be greater than, and their other dimensions not less than, those specified in Table J-1, except in the case of the horizontal section of the approach surface (see paragraph (c) below).

(c)The approach surface should be horizontal beyond the point at which the 2.5 % slope intersects:

(1)a horizontal plane 150 m above the threshold elevation; or

(2)the horizontal plane passing through the top of any object that governs the obstacle clearance altitude/height (OCA/H); whichever is the higher.

(d)New objects or extensions of existing objects should not be permitted above an approach surface within 3 000 m of the inner edge or above a transitional surface except when the new object or extension would be shielded by an existing immovable object.

(e)New objects or extensions of existing objects should not be permitted above the approach surface beyond 3 000 m from the inner edge, the conical surface or inner horizontal surface except when the object would be shielded by an existing immovable object, or after an safety assessment, it is determined that the object would not adversely affect the safety or significantly affect the regularity of operations of aeroplanes.

(f)Existing objects above any of the surfaces required by paragraph (a) should as far as practicable be removed except when the object would be shielded by an existing immovable object, or if after a safety assessment, it is determined that the object would not adversely affect the safety or significantly affect the regularity of operations of aeroplanes.

[Issue: ADR-DSN/3]