Document ID: chunk:federal_register_of_legislation:F2024C01244:reg:5:p88
Version: federal_register_of_legislation:F2024C01244
Segment Type: reg
Provision Reference: reg 5 (pt 88/225)
Character Range: 541019–543769

from the threshold to Point B must consist of barrettes showing variable white. However, if the threshold is displaced 300 m or more, the centreline may consist of single light sources showing variable white.

       (14) Beyond Point B, each centreline light position must consist of 1 of the following, each of which must show variable white light:

(a) 1 barrette used between the threshold and Point B;

(b) 2 light sources from Point B to Point D; and

(c) 3 light sources beyond Point D.

       (15) A barrette must be:

(a) at least 4 m in length; and

(b) if composed of lights approximating to point sources — composed of such lights uniformly spaced at intervals of not more than 1.5 m.

       (16) If the centreline beyond Point B consists of barrettes as described in subsection (14), each barrette must be supplemented by a sequenced flashing light which must:

(a) be flashed twice every second in sequence, beginning with the outermost light of the system and progressing toward the threshold to the innermost light; and

(b) be of such electrical circuit design that it can be operated independently of the other lights of the approach lighting system; and

(c) have a minimum effective intensity of 15 000 cd ± 50%.

Note   See FAA Advisory Circular 150/5345-51, as in force or existing from time to time and freely available from the FAA website, www.faa.gov, for further information.

       (17) Each side row of lights must consist of a barrette:

(a) whose lights show red; and

(b) whose length and light spacing must be equal to the length and light spacing of the barrettes in the touchdown zone.

       (18) The lights forming the crossbars must be:

(a) fixed lights showing variable white light; and

(b) uniformly spaced at intervals of not more than 2.7 m.

       (19) For subsections (17) and (18), the intensity of the red lights must be consistent with the intensity of the white lights.

       (20) The light intensities must be in accordance with Figures 9.43 (1)-1 and 9.43 (1)-2.

Note   For information on the flight path envelopes used in the design of these lights, see ICAO Annex 14, Aerodromes, Volume 1, Aerodrome Design and Operations, Attachment A, Section 11. For ICAO documents, see section 1.07.

     Figure 9.42 (3)   Precision approach CAT II and CAT III lighting systems (shows matters)

CHAPTER 9

Division 8 Isocandela diagrams of approach lighting

9.43 Isocandela diagrams of approach lighting

       (1) The ratio between the average light intensities of the following:

(a) the ellipse defining the main beam of a typical, newly installed approach light;

(b) the main beam of a typical newly installed runway edge light:

        must be as follows:

(c) for approach centreline and