UFC 3-535-01
17 November 2005
Figure 4-2. Runway Edge Light Photometric Requirements
DEGREES
DEGREES
VERTICAL
VERTICAL
5
5
II
MIN. AVERAGE
MIN. AVERAGE
I
10,000 CD
10,000 CD
DEGREES
HORIZONTAL
5
5
5
5
SEE NOTE 2
SEE NOTE 2
5
5
A. EDGE LIGHTS FOR RUNWAYS LESS
B. EDGE LIGHTS FOR RUNWAYS 60M
THAN 60M (200FT) WIDE
(200FT) OR MORE WIDE
I=50% II=10%
I=50% II=10%
a
5.5
7.5
a
6.5
8.5
b
3.5
6.0
b
3.5
6.0
NOTES:
2
2
1. ALL CONTOURS ARE ELLIPSES CALCULATED BY EQUATION X 2 + Y 2 = 1
a
b
2. THE MINIMUM AVERAGE INTENSITY OF THE MAIN BEAM (INSIDE CONTOUR I ) IS
10,000 CD, AVIATION WHITE. MAXIMUM INTENSITY SHOULD NOT EXCEED 1.5 TIMES
ACTUAL AVERAGE INTENSITY.
3. MINIMUM INTENSITY OF I=50% AND II=10% OF REQUIRED MAIN BEAM INTENSITY.
4-2.4
Equipment
Elevated fixtures must be frangible mounted at a maximum of 0.35 meters (14 inches)
above grade. At locations that experience frequent snow accumulations of 0.3 meters
(12 inches) or more, the mounting height may be increased to not more than 0.6 meters
(24 inches) in height. No part of in-pavement fixtures must extend more than 0.025
meters (1 inch) above the surrounding surface. See paragraph 13-10.1 for applicable
fixtures.
4-2.5
Power Requirements
Provide a main and a standby power system with automatic transfer. Where used in
support of Category II or III instrument operations, the transfer must occur within 1
second of a failure of the system. For other operations, transfer must occur within 15
seconds of the power failure.
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