Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p129
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 129/225)
Character Range: 645012–647784

is intended that traffic approaching the closed or exit-only taxiway must stop; and

(b) consist of inset lights spaced 3 m apart across the taxiway; and

(c) be disposed symmetrically about, and at right angles to, the taxiway centreline.

Note   It is recommended that the no entry bar is supplemented with a pair of elevated lights that:
       (i) have the same characteristics as elevated stop bar lights; and
       (ii) are provided abeam the no entry bar; and
       (iii) are located at a distance of at least 3 m from the taxiway edge.
       (4) No entry bar lights must:

(a) be unidirectional; and

(b) show red in the direction of approach to the no entry bar.

       (5) The intensity and beam spread of the no entry bar lights must be in accordance with the applicable specifications in Figures 9.111 (1) to 9.111 (5).

9.109 Photometric characteristics of taxiway lights

       (1) The average intensity of the main beam of a taxiway light is calculated by:

(a) establishing the grid points in accordance with the method shown in Figure 9.111 (7) in section 9.111; and

(b) measuring the light intensity values at all grid points located within, and on the perimeter of, the rectangle representing the main beam; and

(c) calculating the arithmetic average of the light intensity values as measured at those grid points.

       (2) The maximum light intensity value measured on, or within, the perimeter of the main beam must not be more than 3 times the minimum light intensity value so measured.

9.110 Installation and aiming of light fittings

        For the installation and aiming of light fittings, the following requirements must be complied with:

(a) the lights must be aimed so that there are no deviations in the main beam pattern, to within 0.5 degrees of the applicable standard;

(b) horizontal angles must be measured with respect to the vertical plane through the taxiway centreline;

(c) when measuring horizontal angles for lights other than taxiway centreline lights, the direction towards the taxiway centreline must be taken to be positive;

(d) vertical angles specified must be measured with respect to the horizontal plane.

9.111 Isocandela diagrams for taxiway lights

       (1) Figures 9.111 (1) to 9.111 (5) show candela values:

(a) in green and yellow for taxiway centreline lights; and

(b) in red for no entry bar lights and stop bar lights.

       (2) Figures 9.111 (1) to 9.111 (5) show the minimum allowable light intensities.

       (3) The average intensity of the main beam is calculated by:

(a) establishing grid points as shown in Figure 9.111 (7); and

(b) using the intensity values measured at all grid points located within and on the perimeter of the rectangle representing the main beam; and

(c)