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elevation of tops of nearby buildings (when the object to be
marked is surrounded by buildings), additional lights shall be
provided at intermediate levels. These additional intermediate
lights shall be spaced as equally as practicable, between the
top lights and ground level or the level of tops of nearby
buildings, as appropriate, with the spacing not exceeding
105 m (see 6.3.7).
6.3.1 7 Where an object is indicated by medium-intensity
obstacle lights, Type B, and the top of the object is more than
45 m above the level of the surrounding ground or the
elevation of tops of nearby buildings (when the object to be
marked is surrounded by buildings), additional lights shall be
provided at intermediate levels. These additional intermediate
lights shall be alternately low-intensity obstacle lights, Type B,
and medium-intensity obstacle lights, Type B, and shall be
spaced as equally as practicable between the top lights and
ground level or the level of tops of nearby buildings, as
appropriate, with the spacing not exceeding 52 m.
6.3.18 Where an object is indicated by medium-intensity
obstacle lights, Type C, and the top of the object is more than
45 m above the level of the surrounding ground or the
elevation of tops of nearby buildings (when the object to be
marked is surrounded by buildings), additional lights shall be
provided at intermediate levels. These additional intermediate
lights shall be spaced as equally as practicable, between the
top lights and ground level or the level of tops of nearby
buildings, as appropriate, with the spacing not exceeding 52 m.
6.3.19 Where high-intensity obstacle lights, Type A, are
used, they shall be spaced at uniform intervals not exceeding
105 m between the ground level and the top light(s) specified
in 6.3.11 except that where an object to be marked is
surrounded by buildings, the elevation of the tops of the
buildings may be used as the equivalent of the ground level
when determining the number of light levels.
6.3.20 Where high-intensity obstacle lights, Type B, are
used, they shall be located at three levels:
- at the top of the tower,
- at the lowest level of the catenary of the wires or cables;
and
- at approximately midway between these two levels.
Note.- In some cases, this may require locating the lights
ofthe tower
6.3.2 1 Recommendation.- n e installation setting angles
for high-intensity obstacle lights, Types A and B, should be in
accordance with Table 6-2.
6.3.22 The number and arrangement of low-, medium- or
high-intensity obstacle lights at each level to be marked shall
be such that the object is indicated from every angle in
azimuth. Where a light is shielded in any direction by another
part of the object, or by an adjacent object, additional lights
shall be provided on that object in such a way as to retain the
Figure 6-3. Lighting of buildings
6-6
Chapter 6 Annex 14 - Aerodromes
general definition of the object to be lighted. If the shielded
light does not contribute to the definition of the object to be
lighted, it may be omitted.
Table 6-2. Installation setting angles for
high-intensity obstacle lights
Low-intensity obstacle light - Characteristics
Height of light unit
above terrain
greater than 15 1 m AGL
122 m to 151 m AGL
92 m to 122 m AGL
less than 92 m AGL
6.3.23 Low-intensity obstacle lights on fixed objects,
Types A and B, shall be fixed-red lights.
Angle of the peak
of the beam above
the horizontal
0°
1 O
2"
3"
6.3.24 Low-intensity obstacle lights, Types A and B, shall
be in accordance with the specifications in Table 6-3.
6.3.25 Low-intensity obstacle lights, Type C, displayed
on vehicles associated with emergency or security shall be
flashing-blue and those displayed on other vehicles shall be
flashing-yellow.
6.3.26 Low-intensity obstacle lights, Type D, displayed
on follow-me vehicles shall be flashing-yellow.
6.3.27 Low-intensity obstacle lights, Types C and D, shall
be in accordance with the specifications in Table 6-3.
6.3.28 Low-intensity obstacle lights on objects with
limited mobility such as aerobridges shall be fixed-red. The
intensity of the lights shall be sufficient to ensure conspicuity
considering the intensity of the adjacent lights and the general
levels of illumination against which they would normally be
viewed.
Note.- See Anna 2 for lights to be displayed by aircrafr.
6.3.29 Low-intensity obstacle lights on objects with
limited mobility shall as a minimum be in accordance with the
　
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