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specifications for low-intensity obstacle lights, Type A, in
Table 6-3.
Medium-intensity obstacle light - Characteristics
6.3.30 Medium-intensity obstacle lights, Type A, shall be
flashing-white lights, Type B shall be flashing-red lights and
Type C shall be fixed-red lights.
6.3.31 Medium-intensity obstacle lights, Types A, B and
C, shall be in accordance with the specifications in Table 6-3.
6.3.32 Medium-intensity obstacle lights, Types A and B,
located on an object shall flash simultaneously.
High-intensity obstacle light - Characteristics
6.3.33 High-intensity obstacle lights, Types A and B,
shall be flashing-white lights.
6.3.34 High-intensity obstacle lights, Types A and B,
shall be in accordance with the specifications in Table 6-3.
6.3.35 High-intensity obstacle lights, Type A, located on
an object shall flash simultaneously.
6.3.36 Recommendation.- High-intensity obstacle
lights, Type B, indicating the presence of a tower supporting
overhead wires, cables, etc., shouldflash sequential1y;first the
middle light, second the top light and last, the bottom light.
fie intervals between flashes of the lights should approximate
the following ratios:
Flash interval between Ratio of cycle time
middle and top light 1/13
top and bottom light 2/13
bottom and middle light 10/13.
Table 6-3. Characteristics of obstacle lights
Note.- This table does not include recommended horizontal beam spreads. 6.3.22 requires 360' coverage around an obstacle. Therefore, the number meet this requirement will depend on the horizontal beam spreads of each light as well as the shape of the obstacle. Thus, with narrower beam spreads, required.
1
Light Type
Low-intensity, Type A
(fixed obstacle)
Low-intensity, Type B
(fixed obstacle)
Low-intensity, Type C
(mobile obstacle)
Low-intensity, Type D
Follow-me Vehicle
Medium-intensity,
Type A
Medium-intensity,
Type B
Medium-intensity,
Type C
High-intensity,
Type A
High-intensity,
Type B
a) See 6.3.25
b) Effective intensity, as determined in accordance with the Aerodrome Design Manual, Part 4.
c) Beam spread is defined as the angle between two directions in a plane for which the intensity is equal to 50% of the lower tolerance value of the intensity 4, 5 and 6. The beam pattern is not necessarily symmetrical about the elevation angle at which the peak intensity occurs.
d) Elevation (vertical) angles are referenced to the horizontal.
2
Colour
Red
Red
Yellow/Blue
(a)
Yellow
White
Red
Red
White
White
e) Intensity at any specified horizontal radial as a percentage of the actual peak intensity at the same radial when operated at each of the intensities and 6.
f ) Intensity at any specified horizontal radial as a percentage of the lower tolerance value of the intensity shown m columns 4, 5 and 6.
g) In addition to specified values, lights shall have sufficient intensity to ensure conspicuity at elevation angles between * 0" and 50'.
h) Peak intensity should be located at approximately 2.5' vertical.
i) Peak intensity should be located at approximately 17' vertical. fpm - flashes per minute; 3
Signal type/
(flash rate)
Fixed
Fixed
Flashing
(60-90 fpm)
Flashing
(60-90 fpm)
Flashing
(20-60 fpm)
Flashing
(20-60 fpm)
Fixed
Flashing
(40-60 fpm)
Flashing
(40-60 fpm)
4 5 6
Peak intensity (cd) at given Background Vertical
Beam
Spread
(c)
10"
1 0°
12' (h)
12' (i)
3' mnm
3"mnm
3"mnm
3'-7'
3'-7"
Above
500 cdm2
N/ A
N/A
N/A
N/A
20000 (b) * 25%
N/A
N/A
200 000 (b) * 25%
100000 (b) * 25%
7
Luminance
50-500 cdm2
10 mnm
32 mnm
40 mnm (b)
400 max
200 mnm (b)
400 max
20000 (b) * 25%
N/ A
N/A
20 000 (b) * 25%
20 000 (b) * 25% \
Intensity (cd) at given Elevation 8
Below
50 cdm2
10 mnm
32 mnm
40 mnm (b)
400 max
200 mnm (b)
400 max
2 000 (b) * 25%
2000(b) * 25%
2000(b) * 25%
2 000 (b) * 25%
2 000 (b) * 25%
-10' (e)
-
-
-
-
3% max
-
-
3% max
3% max
9
when the
-1' (f)
-
-
-
-
50% mnm
75% max
50% mnm
75% max
50% mnm
75% max
50% mnm
75% max
50% mnm
75% max
10
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