Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p44
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 44/225)
Character Range: 428681–431624

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 objects attached to the wire or cables.

Note   Spheres and pyramids are examples of 3-dimensional objects.

       (8) The objects mentioned in subsection (7) must:

(a) be approximately equivalent in size to a cube with 600 mm sides; and

(b) be spaced 30 m apart along the length of the wire or cable.

8.111 Marking of hazardous transient obstacles

       (1) This section applies if CASA determines in writing, following an assessment, that a transient object is a hazardous obstacle.

       (2) The transient hazardous obstacle must be:

(a) marked in the same way as a hazardous obstacle under section 8.110 (a section 8.110 marking); or

(b) if a section 8.110 marking is not possible — marked with visual aids that:

 (i) delineate the shape and size of the obstacle; or

 (ii) make the hazardous obstacle clearly visible to aircraft using the aerodrome.

CHAPTER 8

Division 11 Frangibility of markers and signs

8.112 Markers

       (1) To meet the frangibility requirements of this MOS, the materials used in markers must:

(a) have a low modulus of toughness; and

(b) be sufficiently strong and lightweight for the purpose of the marker.

Note   In general terms, toughness is defined as the capacity of a material to resist fracture under dynamic loads. The modulus of toughness is the ultimate amount of energy by volume that a material will absorb and is determined by measuring the area under the material's stress-strain diagram when plotted to failure. Minimum weight is important to ensure that the least amount of energy is expended to accelerate the mass to the velocity of an impacting aircraft. Further information is available in ICAO Document 9157, Aerodrome Design Manual, Chapter 6  – Frangibility. For ICAO documents, see section 1.07.

       (2) Frangible materials must withstand, or be protected from, outdoor environmental effects, including weathering, solar radiation and temperature fluctuation.

       (3) If weights or fixtures are used to hold markers in place, the weights or fixtures must:

(a) themselves be frangible; and

(b) not compromise the frangibility of the marker.

8.113 Movement area guidance signs

Note   Movement area guidance signs include (a) mandatory instruction signs, such as runway designation signs, CAT I, II and III holding position signs, runway holding position signs, road-holding position signs and no entry signs; and (b) information signs, such as direction signs, location signs, runway exit signs, runway vacated signs and intersection take-off signs.

       (1) Movement area guidance signs (MAGS) must be:

(a) frangible; and

(b) constructed of lightweight materials.

Note   CASA