Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p43
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 43/225)
Character Range: 426211–428953

vicinity of, the aerodrome is a hazardous obstacle; and

(b) what, if any, marking is required for that hazardous obstacle.

8.110 Marking of hazardous obstacles

       (1) A hazardous obstacle, other than wires and cables, must be marked in a pattern of contrasting colours which also contrast with the background.

Note   For example, contrasting colours may be orange and white, or red and white.

       (2) Any hazardous obstacle with unbroken surfaces that are more than 4.5 m by 4.5 m in size, must be marked:

(a) in a chequered pattern of lighter and darker squares or rectangles each of whose sides is not less than 1.5 m, and not more than 3 m, long, as shown in Figure 8.110 (2); and

(b) so that the corners of the obstacle are in the darker colour.

     Figure 8.110 (2)   Marking of square face obstacle (shows matters)

       (3) The following:

(a) a hazardous obstacle that is more than 1.5 m in 1 direction and less than 4.5 m in the other direction;

(b) a hazardous obstacle of a lattice-work construction, for example a crane or a radio tower, that is greater than 1.5 m in both directions;

        must be marked, as shown in Figure 8.110 (3):

(c) with alternating contrasting bands of colour; and

(d) with the ends in the darker colour; and

(e) with the bands:

 (i) at right angles to the longest dimension; and

 (ii) having a width, shown as "S" in Figure 8.110 (3), that is, approximately, the lesser of:

             (A) 1/7 of the longest dimension; or

             (B) 30 m.

     Figure 8.110 (3)   Marking of squat or tall face objects or structures (shows matters)

       (4) A hazardous obstacle (other than a mast, pole or tower) with any dimension less than 1.5 m must be marked in a solid colour that contrasts with the surrounding environment.

       (5) As illustrated in Figure 8.110 (5), long, narrow structures like masts, poles and towers which are hazardous obstacles must be marked in contrasting colour bands so that:

(a) the darker colour is at the top; and

(b) the bands:

           (i) are, as far as physically possible, marked at right angles along the length of the long, narrow structure; and

           (ii) have a length ("z" in Figure 8.110 (5)) that is, approximately, the lesser of:

             (A) 1/7 of the height of the structure; or

             (B) 30 m.

     Figure 8.110 (5)   Marking of mast, pole and tower (illustrates matters)

       (6) Fence posts, determined by CASA to be hazardous obstacles, must be marked in a single conspicuous colour that contrasts with the surrounding environment.

Note   CASA recommends that the colour be white.

       (7) Hazardous obstacles in the form of wires or cables must be marked using 3-dimensional coloured