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light, except where such lighting is considered unnecessary
taking into account the characteristics of the system and the
nature of the meteorological conditions.
5.3.4.18 Each capacitor discharge light as described in
5.3.4.17 shall be flashed twice a second in sequence,
beginning with the outermost light and progressing toward the
threshold to the innermost light of the system. The design of
the electrical circuit shall be such that these lights can be
operated independently of the other lights of the approach
lighting system.
5.3.4.19 If the centre line consists of lights as described in
5.3.4.14 a) or 5.3.4.15 a), additional crossbars of lights to the
crossbar provided at 300 m from the threshold shall be
provided at 150 m, 450 m, 600 m and 750 m fiom the
threshold. The lights forming each crossbar shall be as nearly
as practicable in a horizontal straight line at right angles to,
and bisected by, the line of the centre line lights. The lights
Annex 14 - A e h m e s
shall be spaced so as to produce a linear effect. except that
gaps may be left on each side of the centre line. These gaps
shall be kept to a minimum to met local requirements and
each shall not exceed 6 rn.
Note.- See Attachment A, Section 11 for detailed confguration.
5.3.4.20 Where the additional crassbars described in
5.3.4.19 are incorporated in the system, the outer ends of the
c r o s s h shall lie on two straight lines that either are parallel
to the line of the centre line lights or converge to rneet the
runway centre line 300 m from threshold
5.3.4.21 The lights shall be in accordance with the specifications
of Appendix 2. Figure A2-1.
Note.- i%e flight path enwbps used in the design of
these fights are given in Attachment A, Figure A4.
Prtckwn appmh categwy I1 and 122
fighting system
5.3.4.22 The approach lighting system shall consist of a
row of lights on the extended centre line of the runway.
extending, wherever possible. over a distance of 900 m From
the runway threshold. In addition, the system shall have two
side rows of lights, extending 270 rn from the threshold, and
two crossbats, one at 150 m and one at 300 m from the
threshold, all as shown in Figure 5-13. Where the
serviceability level of the approach lights specified as
maintenance objectives in 10.4.7 can be demonstrated, the
system may have two side rows of lights. extending 240 m
from the threshold, and two crossbars, one at 150 m and one
at 300 m from the threshold, all as shown in Figure 5-14.
Note.- The length of900 m is based on ptvviding guidance
for opemrions under category I, I! and I11 conditions. Reduced
lengths may support category If and If1 opetntions hit may
impose limitations on category I operations. See Attachment A.
Section I I .
5.3.4.23 The lights farming the centre line shall be placed
at longitudinal intervals of 30 m with the innermost lights
located 30 m from the threshold.
5.3.4.24 The lights forming the side rows shall be placed
on each side of the centre line, a1 a longitudinal spacing equal
to that of the centre line lights and with the fist light located
30 m from the threshold Where the serviceability level of the
approach lights specified as maintenance objectives in 10.4.7
can be demonstrated, lights forming the side rows may be
placed on each side of the centre line, at a longitudinal spacing
of 60 m with the first light located 60 m from the threshold.
The lateral spacing (or gauge) between the innermost lights of
the side rows shall be not less than 18 m nor more than 22.5 rn,
and preferably 18 m, but in any event shall be equal to that of
the touchdown zone lights.
5.3.4.25 The crossbar provided at 150 m from the
threshold shall fill in the gaps between the centre line and side
row lights.
5.3.4.26 The crossbar provided at 300 m from the
threshold shall extend on both sides of the centre line lights to
a distance of 15 m from the centre line.
5.3.4.27 If the centre line beyond a distance of 300m
from the threshold consists of lights as described in 5.3.4.31 b)
or 5.3.4-32 b), additional crossbats of lights shall be provided
at 450 m. 600 m and 750 m from the threshold.
5.3.4.28 Where the additional crossbars described in
5.3.4.27 are incorporated in the system, the outer ends of these
crossbars shall lie on two straight lines that either are parallel
to the centre line or converge to rneet the runway centre line
300 m from the threshold.
5.3.4.29 The system shall lie as nearly as practicable in the
horizontal plane passing through the threshold provided that:
a) no object other than an ILS or MLS azimuth antenna shall
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