Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p113
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 113/225)
Character Range: 603757–606550

intensity of runway lights for non-instrument and instrument non‑precision approach runways.

       (2) Figure 9.75 (12) shows the method that must be followed to establish grid points for calculating the average intensity of runway lights for precision approach runways.

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

(a) establishing the grid points; and

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

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

       (4) 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.

9.74 Installation and aiming of light fittings

        The installation and aiming of light fittings must comply with the following requirements:

(a) the lights must be installed so that there is no deviation in the main beam pattern that is greater than 0.5 degrees from the applicable standard specified in section 9.75;

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

(c) for the measurement of horizontal angles for lights other than runway centreline lights, the direction towards the runway centreline must be taken to be positive;

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

9.75 Isocandela diagrams of runway lighting

       (1) For this section:

(a) Figures 9.75 (1) to 9.75 (10) show the minimum allowable light intensities for runway lighting; and

(b) the boundaries (normally ellipses) in each Figure are symmetrical about the common vertical and horizontal axes; and

(c) the average light intensity of a runway light main beam must be calculated by:

 (i) establishing the grid points as shown in Figure 9.75 (11) or 9.75 (12), as the case requires; and

 (ii) using the intensity values measured at all grid points located within, and on, the boundary (normally an ellipse) representing the main beam; and

 (iii) using the arithmetic average of the light intensities measured at all considered grid points as the average value.

       (2) The ratio between:

(a) the average light intensity within the boundary (normally an ellipse) defining the main beam of a typical new light of a kind mentioned in a row in column 2 of Table 9.75 (2); and

(b) the average light intensity of the main beam of a new runway edge light;

        must be that given in the same row in column 3, as shown in the Figure mentioned in the same row in column 1.

     Table 9.75 (2)   Average main beam light intensity ratios

Relevant figure for light intensity