CS HPT-DSN.E.430 Obstacle limitation requirements

(a)General: The following obstacle limitation surfaces should be established for a FATO:

(1)take-off climb surface; and

(2)approach surface.

(b)Characteristics:

(1)The slopes of the obstacle limitation surfaces should not be greater than, and their other dimensions not less than, those specified in Table E-1 and should be located as shown in Figures E-1, E-2 and E-4.

(2)Where a heliport visual approach slope indicator is installed, additional obstacle protection surfaces should be provided, as specified in CS HPT-DSN.F.660, which can be more demanding than the obstacle limitation surfaces prescribed in Table E-1.

(3)For heliports that have an approach/take-off climb surface with a 4.5 per cent slope design, objects can be permitted to penetrate the obstacle limitation surface, 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 helicopters.

(4)New objects or extensions of existing objects should not be permitted above the approach or take-off climb surfaces except when shielded by an existing immovable object or when after a safety assessment, it is determined that the object would not adversely affect the safety or significantly affect the regularity of operations of helicopters.

(5)Existing objects above the approach and take off climb surfaces should, as far as practicable, be removed except when the object is shielded by an existing immovable object or when after a safety assessment, it is determined that the object would not adversely affect the safety or significantly affect the regularity of operations of helicopters.

(6)When only a single approach and take-off climb surface is provided, a safety assessment should be undertaken considering as a minimum, the following factors:

(i)the area/terrain over which the flight is being conducted;

(ii)the obstacle environment surrounding the heliport;

(iii)the performance and operating limitations of helicopters intending to use the heliport; and

(iv)the local meteorological conditions including the prevailing winds.