Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p98
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 98/225)
Character Range: 565541–568173

light units forming a wing bar must be frangible, and mounted:

 (i) as low as possible; and

 (ii) so as to appear to a pilot of an approaching aeroplane to be substantially in a horizontal line; and

(b) the light units must be located:

 (i) for a PAPI — as shown in Figure 9.50 (1), and subject to the installation tolerances shown in the Figure; and

 (ii) for a double-sided PAPI — as shown in Figure 9.50 (1):

             (A) as if the light units A, B, C and D and related dimensions were also shown on the other side of the runway with unit D closest to the runway; and

             (B) subject to the installation tolerances shown in the Figure.

     Figure 9.50 (1)   Siting of PAPI light units (shows matters)

       (2) If the row of runway edge lights is located beyond the standard 3 m specified in subsection 9.51 (10), then in accordance with subsection 9.51 (11) the PAPI may be located with the inner light unit 13 ± 1 m from the line of the edge lights, rather than 15 ± 1 m from the runway edge.

Note 1   Reducing the spacing between PAPI light units results in a reduction in the usable range of the system.

Note 2   When the runway edge lights are relocated to the standard location, CASA recommends that the PAPI should also be relocated to the standard location.

       (3) Subject to subsection (4), the distance (D1) in Figure 9.50 (1), of a PAPI wing bar from the runway threshold, is to be determined by the following:

(a) the requirement to provide adequate wheel clearance over the threshold for all types of aircraft landing on the runway;

(b) the operational requirement that the PAPI is compatible with any non-visual glide path down to the minimum possible range and height;

(c) any difference in elevation between the PAPI units and the runway threshold;

(d) the remaining length of runway past the touch-down zone available for stopping the aircraft;

(e) obstacle clearance.

       (4) In Table 9.50 (4), for the most demanding of the aircraft regularly using the runway, for each of the 4 pilot-eye-to-wheel height groups mentioned in a row of column 1:

(a) column 2 specifies the standard wheel clearance over the threshold which, subject to paragraph (b), must be used where possible; and

(b) column 3 specifies the reduced wheel clearance over the threshold which may be used if:

 (i) the landing run is limited; and

 (ii) adherence to the standard wheel clearance would cause a loss of landing distance; and

 (iii) there are no objects or structures under the approach near the threshold, for example, approach light supporting structures, boundary fences or roads; and