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Note I.- When the barrette as in b) is composed of lights
approximating to point sources, a spacing of 1.5 m between
adjacent lights in the barrette has beenfbund satisfactory.
Note 2.- It may be advisable to use barrettes 4 m in length
if it is anticipated that the simple approach lighting system will
be developed into a precision approach lighting system.
Note 3.- At locations where ident$cation of the simple
approach lighting system is diffcult at night due to surrounding
lights, sequence flashing lights installed in the outer
portion of the system may resolve this problem.
5.3.4.8 Recommendation.- Where provided for a noninstrument
runway, the lights should show at all angles in
Annex 14 -Aerodromes Volume I
azimuth necessary to a pilot on base leg and final approach.
The intensity of the lights should be adequate for all conditions
of visibility and ambient light for which the system has been
provided.
5.3.4.9 Recommendation.- Where provided for a nonprecision
approach runway, the lights should show at all
angles in azimuth necessary to the pilot of an aircraft which
on jnal approach does not deviate by an abnormal amount
fiom the path dejned by the non-visual aid. The lights should
be designed to provide guidance during both day and night in
the most adverse conditions of visibility and ambient light for
which it is intended that the system should remain usable.
Precision approach category I
lighting system
Location
5.3.4.10 A precision approach category I 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 with a row of lights forming
a crossbar 30 m in length at a distance of 300 m from the
runway threshold.
Note.- The installation of an approach lighting system of
less than 900 m in length may result in operational limitations
on the use of the runway. See Attachment A, Section 11.
5.3.4.1 1 The lights forming the 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 of
the crossbar shall be spaced so as to produce a Iinear effect,
except that gaps may be left on each side of the centre line.
These gaps shall be kept to a minimum to meet local requirements
and each shall not exceed 6 m.
Note I.- Spacings for the crossbar lights between I m and
4 m are in use. Gaps on each side of the centre line may
improve directional guidance. when approaches are made with
a lateral error, and facilitate the movement of rescue andjre
fighting vehicles.
Note 2.- See Attachment A, Section I1 for guidance on
installation' tolerances.
5.3.4.12 The lights forming the centre line shall be placed
at longitudinal intervals of 30 m with the innermost light
located 30 m from the threshold.
5.3.4.13 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
protrude through the plane of the approach lights within a
distance of 60 m from the centre line of the system; and
b) no light other than a light located within the central part of
a crossbar or a centre line barrette (not their extremities)
shall be screened from an approaching aircraft.
Any ILS or MLS azimuth antenna protruding through the
plane of the Iights shall be treated as an obstacle and marked
and lighted accordingly.
Characteristics
5.3.4.14 The centre line and crossbar lights of a precision
approach category I lighting system shall be fixed lights
showing variable white. Each centre line light position shall
consist of either:
a) a single light source in the innermost 300 m of the
centre line, two light sources in the central 300 m of the
centre line and three light sources in the outer 300 m of
the centre line to provide distance information; or
b) a barrette.
5.3.4.15 Where the serviceability level of the approach
lights specified as a maintenance objective in 10.4.10 can be
demonstrated, each centre line light position may consist of
either:
a) a single light source; or
b) a barrette.
5.3.4.16 The barrettes shall be at least 4 m in length.
When barrettes are composed of lights approximating to point
sources, the lights shall be uniformly spaced at intervals of not
more than 1.5 m.
5.3.4.17 Recommendation.- If the centre line consists
of barrettes as described in 5.3.4.14 b) or 5.3.4.15 b), each
barrette should be supplemented by a capacitor discharge
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