Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p81
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 81/225)
Character Range: 523671–526381

crossbar at Point B.

       (6) The lights forming a crossbar in a SALS must be:

(a) as nearly as possible in a horizontal straight line at right angles to, and bisected by, the line of the centreline lights; and

(b) spaced so as to produce a linear effect, except that gaps may be left on each side of the centreline, provided:

           (i) the spacing of gaps each side of the centreline is kept to a minimum necessary to meet local requirements; and
           (ii) no gap exceeds 6 m.

       (7) Subject to paragraph (6) (b), all spaces between crossbar lights must be:

(a) at least 1 m, but not more than 4 m; and

(b) equal to each other.

Note   Gaps on each side of the centreline may improve directional guidance when approaches are made with a lateral error, and may facilitate the movement of rescue and firefighting vehicles. See ICAO Annex 14, Aerodromes, Volume 1, Aerodrome Design and Operations, Attachment A, Section 11, for guidance on installation tolerances. For ICAO documents, see section 1.07.

       (8) As shown in Figure 9.39 (2), in a SALS, the lights forming the centreline must be positioned with longitudinal intervals of 60 m, within a tolerance of ± 2 m, with the innermost light located 60 m from the threshold, except that:

(a) if it is desired to improve the guidance provided by the lights, an interval of 30 m, within a tolerance of ± 2 m, may be used with the innermost light located 30 m from the threshold; and

(b) the spacing between the centreline lights or barrettes may be adjusted to ensure even spacing between crossbars or between crossbar and threshold.

Note   Centreline lights installed at 30 m intervals would maximise the probability of pilots acquiring sufficient visual reference to complete an instrument approach to landing.

       (9) The SALS must lie as nearly as possible in the horizontal plane passing through the threshold, and be such that:

(a) no object or structure, other than an ILS azimuth antenna, protrudes through the plane of the approach lights within a distance of 60 m from the centreline of the system; and

(b) no light, other than a light located within the central part of a crossbar or a centreline barrette (not their extremities), is screened from an approaching aircraft.

       (10) An ILS azimuth antenna protruding through the plane of the SALS must be treated as an obstacle and marked and lighted as an obstacle.

     Figure 9.39 (2)   Simple approach lighting system (shows matters)

9.40 Simple approach lighting system — additional requirements

       (1) The lights of a SALS must be:

(a) for a SALS installed in conjunction with high-intensity runway lighting:

           (i) fixed lights showing