Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p79
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 79/225)
Character Range: 518829–521529

vicinity of the threshold of an instrument runway, the WDI must be lit at night as an illuminated WDI (IWDI) unless:

(a) surface wind information is available through a broadcast aerodrome weather information service (an AWIS) or a person mentioned in regulation 120 of CAR; or

(b) the instrument approach procedure for the runway is restricted to daytime operations only.

Note   CASA recommends that an IWDI should be provided at the threshold of all runways that are available for use at night.

       (3) For an IWDI, floodlighting must be used:

(a) to illuminate the IWDI from above; and

(b) to illuminate the IWDI sleeve from all directions of azimuth simultaneously.

       (4) For subsection (3), the IWDI sleeve must be illuminated by at least 4 separated lamp units that together provide at least 100 lux illumination to all points of the horizontal plane passing through the top of the IWDI sleeve at the supporting pole end for the 360‑degree area swept by the fully-extended sleeve.

Note   An acceptable method of verification for illumination is to measure illumination levels on the horizontal plane passing through the top of the sleeve at the pole end. CASA recommends that measurements should be taken at 1 m intervals starting at the pole and working outwards on a radial to the pole to a range equal to the length of the fully-extended sleeve. The outermost interval on each radial may be less than 1 m to correspond with the actual length of the sleeve. The radials should be at 30-degree intervals. Each reading must be at least 100 lux.

       (5) For an IWDI, the lighting must:

(a) ensure accurate colour rendering; and

(b) have no perceptible warm-up or re-strike delay.

       (6) If there is only one IWDI then control of its lighting must be incorporated in each runway's lighting control, so that activating any runway lighting system automatically activates the IWDI lighting.

       (7) If there is more than one IWDI, control of the lighting of each IWDI must be incorporated into the runway lighting control for the runway that the IWDI serves.

       (8) If the power supply to an IWDI is from a runway lighting circuit with intensity control, the IWDI light intensity must be in accordance with subsection (4) irrespective of the intensity setting of the runway lighting.

       (9) If a PAL is installed then the IWDI lighting must be programmed in such a way that 10 minutes before the end of the aerodrome lighting "on" period, the lights of at least 1  IWDI will:

(a) start to flash, at between 40 to 50 flashes per minute; and

(b) continue to flash until the PAL:

           (i) switches off, and all other aerodrome lighting is extinguished;