UFC 3-535-01
17 November 2005
Optimum aiming of the lights depends on the design and layout of the fixtures used in
the system. The light fixtures may be designed to cover several applications and may
have fixed patterns and aiming angles which differ from this document. The light aiming
and patterns other than those cited in this standard may be used if the resultant light
pattern produces equivalent light intensities in the areas regulated by the standard. TDZ
lights must emit uni-directional aviation white light with intensities as shown in Figure
4-14. They must be toed in 4 degrees toward the centerline and aimed upward 5.5
degrees. The lights must operate at five intensity steps as specified in paragraph 4-2 for
HIRL.
Figure 4-14. Touchdown Zone Light Photometric Requirements
DEGREES
VERTICAL
5
II
MIN. AVERAGE
I
5000 CD
DEGREES
HORIZONTAL
5
5
SEE NOTE 2
5
TOUCHDOWN ZONE LIGHTS, WHITE
I=50% II=10%
a
5.0
7.0
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
5,000 CD AVIATION WHITE. MAXIMUM INTENSITY SHOULD NOT EXCEED 1.5 TIMES
ACTUAL AVERAGE INTENSITY.
3. CONTOURS I=50% AND II=10% INDICATE THE MINIMUM VALUES AT THESE
PERCENTAGES OF THE MAIN BEAM INTENSITY.
4. THE INTENSITY REQUIREMENTS FOR THE ANGLES BELOW THE SURFACE OF THE
PAVEMENT MAY BE DISREGARDED.
4-8.4
Adjustment and Tolerances
The location of the pairs of light bars may be adjusted a maximum of 0.6 meters (2 feet)
longitudinally to avoid construction joints. Installation tolerance for the fixtures is 0.27
meters (11 inches) from the design location in any direction. The mounting surface of
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