Div 10Obstacle markings

Division 10 Obstacle markings

8.109 Obstacles and hazardous obstacles

(1) The following objects or structures at an aerodrome are obstacles and must be marked in accordance with this Division unless CASA determines otherwise under subsections (3) and (5):

(a) any fixed object or structure, whether temporary or permanent in nature, extending above the obstacle limitation surfaces;

Note An ILS building is an example of a fixed object.

(b) any object or structure on or above the movement area that is removable and is not immediately removed.

(2) An aerodrome operator must notify CASA in writing of all obstacles at the aerodrome.

(3) CASA must assess each obstacle notified under subsection (2), and may determine in writing:

(a) that an obstacle is a hazard to aircraft (a hazardous obstacle); and

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

(4) Details of hazardous obstacles, including their lighting and marking requirements, must be included in the aerodrome operator’s aerodrome manual, unless CASA has made a determination under subsection (5).

(5) CASA may determine in writing that a hazardous obstacle may remain unmarked because it is:

(a) sufficiently conspicuous in shape, size or colour; or

(b) shielded by another obstacle that is already marked; or

(c) lit by high-intensity obstacle lights by day and night.

(6) Despite subsection (1), CASA may determine in writing, following an assessment:

(a) that an object or structure on, or within the immediate 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.

Shows Marking of square face obstacle including measurements.

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