getting to grips with CAT II CAT III operations(47)

Figure 5.2 Runway marks Figure 5.3

5.4 VISUAL AIDS-RUNWAY LIGHTS
Runway lights on runways intended for use by CAT II or CAT III operations consist of high intensity threshold lights, runway end lights, runway touchdown zone lights, runway edge lights, and runway centerline lights. The basic pattern of runway lights is shown in Figure 5.4. This paragraph also includes requirements for taxiway lights as shown in Figure 5.5.
5.4.1 RUNWAY EDGE LIGHTS
Runway edge lights are placed along the full length of the runway in two parallel rows equidistant from the centerline, with a distance of no more than 3m to the runway edge. These lights are uniformly spaced at intervals of no more than 60m and may be omitted at the intersections. The lights are fixed lights showing variable white.
5.4.2 THRESHOLD LIGHTS
Threshold lights are placed in a row at right angles to the runway axis, outside the runway with a distance of no more than 3m to the threshold.
The lights are fixed unidirectional lights showing green, uniformly spaced at intervals of no more than 3m.
5.4.3 RUNWAY END LIGHTS
Runway end lights are placed in a row at right angles to the runway axis, outside the runway with a distance of no more than 3m to the runway end.
The lights are fixed unidirectional lights showing red, with a minimum number of 6 lights. ICAO also recommends a spacing between the lights of no more than 6m for runways intended for use by CAT III approaches.
5.4.4 RUNWAY CENTERLINE LIGHTS
Runway centerline lights are a specific requirement for CAT II or CAT III approaches. They are located along the centerline of the runway, with a longitudinal spacing of approximately 7.5m, 15m or 30m for CAT II and only 7.5m or 15m for CAT Ill.
These lights are fixed lights showing:
.  Variable white from the threshold to the point 900m from the runway end.
.  Alternate red and variable white from the point 900m to the point
300m from the runway end (pairs of red lights followed by pairs of
variable white lights if the spacing is only 7.5m)
.  Red from the point 300m to the runway end.
(If the runway length is less than 1800m, the alternate red and
variable white lights are extended from the mid-point of the runway
to 300m from the runway end).
5.4.5 TOUCHDOWN ZONE LIGHTS
Runway touchdown zone lights are a specific requirement for CAT II or CAT IIIapproaches. They extend from the threshold for a longitudinal distance of 900m (full touchdown zone) but do not extend beyond the mid-point if runway length is less than 1800m.
The pattern is formed by pairs of barrettes containing at least three lights. The lights inside each barrette are fixed unidirectional lights showing variable white, spaced at an interval of no more than 1.5m. Each barrette must be not less than 3m and no more than 4.5m in length. The lateral spacing (or gauge) between the lights is not less than 18m and no more than 22.5m with a preference of 18m. The longitudinal spacing between pairs of barrettes is 60m or 30m, but it is recommended to have a spacing of 30m for low minima.
　
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