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extensive one and its height above the surrounding ground is
less than 45 m.
a) an aeronautical study indicates such lights to be
essential for the recognition of the presence of wires,
cables, etc.; or
b) it has not been found practicable to install markers on
the wires, cables, etc.
6.3.10 Recommendation.- Where, in the opinion of the
appropriate authority, the use of high-intensity obstacle lights,
Type A or B, or medium-intensity obstacle lights, Type A, at
night may dazzle pilots in the vicinity of an aerodrome (within
approximately 10000 m radius) or cause significant
environmental concerns, a dual obstacle lighting system
should be provided. This system should be composed of
high-intensity obstacle lights, Type A or B, or mediumintensity
obstacle lights, Type A, as appropriate, for daytime
and twilight use and medium-intensity obstacle lights, Type B
or C, for night-time use.
Location of obstacle lights
6.3.3 Recommendation.- Where the use of low-intensity
obstacle lights, Type A or B, would be inadequate or an early Note.- Recommendations on how a combination of low-,
warning is required, then medium- or high-intensity medium-, andor high-intensity lights on obstacles should be
obstacle lights should be used. displayed are given in Appendix 6.
6.3.4 Low-intensity obstacle lights, Type C, shall be
displayed on vehicles and other mobile objects excluding
aircraft.
6.3.5 Low-intensity obstacle lights, Type D, shall be
displayed on follow-me vehicles.
6.3.6 Recommendation.- Low-intensity obstacle lights,
Type B, should be used either alone or in combination with
medium-intensity obstacle lights, Type B, in accordance with
6.3.7.
6.3.7 Recommendation.- Medium-intensity obstacle
lights, Type A, B or C, should be used where the object is an
extensive one or its height above the level of the surrounding
ground is greater than 45 m. Medium-intensity obstacle lights,
Types A and C, should be used alone, whereas mediumintensity
obstacle lights, Type B, should be used either alone
or in combination with low-intensity obstacle lights, Type B.
Note.- A group of trees or buildings is regarded as an
extensive object.
6.3.8 Recommendation.- High-intensity obstacle lights,
Type A, should be used to indicate the presence of an object if
its height above the level of the surrounding ground exceeds
IS0 m and an aeronautical study indicates such lights to be
essential for the recognition of the object by day.
6.3.9 Recommendation.- High-intensity obstacle lights,
Type B, should be used to indicate the presence of a tower
supporting overhead wires, cables, etc., where:
6.3.11 One or more low-, medium- or high-intensity
obstacle lights shall be located as close as practicable to the
top of the object. The top lights shall be so arranged as to at
least indicate the points or edges of the object highest in
relation to the obstacle limitation surface.
6.3.12 Recommendation.- In the case of chimney or
other structure of likefunction, the top lights should be placed
suficiently below the top so as to minimize contamination by
smoke etc. (see Figures 6-2 and 6-3).
6.3.13 In the case of a tower or antenna structure
indicated by high-intensity obstacle lights by day with an
appurtenance, such as a rod or an antenna, greater than 12 m
where it is not practicable to locate a high-intensity obstacle
light on the top of the appurtenance, such a light shall be
located at the highest practicable point and, if practicable, a
medium-intensity obstacle light, Type A, mounted on the top.
6.3.14 In the case of an extensive object or of a group of
closely spaced objects, top lights shall be displayed at least on
the points or edges of the objects highest in relation to the
obstacle limitation surface, so as to indicate the general
definition and the extent of the objects. If two or more edges
are of the same height, the edge nearest the landing area shall
be marked. Where low-intensity lights are used, they shall be
spaced at longitudinal intervals not exceeding 45 m. Where
medium-intensity lights are used, they shall be spaced at
longitudinal intervals not exceeding 900 m.
6.3.15 Recommendation.- When the obstacle limitation
surface concerned is sloping and the highest point above the
Annex 14 -Aerodromes Volume I
obstacle limitation suface is not the highest point of the
object, additional obstacle lights should be placed on the
highest point of the object.
6.3.16 Where an object is indicated by medium-intensity
obstacle lights, Type A, and the top of the object is more than .
105 m above the level of the surrounding ground or the
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