UFC 3-535-01
17 November 2005
the opposite end threshold fixtures provided the photometric requirements are met.
(See Figure 4-3 for the Air Force configuration, and Figure 4-4 for the Army
configuration). When runway width exceeds 45 meters (150 feet) additional runway end
lights may be added.
4-6.3
Photometric Requirements
Optimum aiming of lights depends on the design and output of the fixtures used in the
system. Light fixtures may be designed to cover several applications and may have
fixed patterns and aiming angles that differ from this document. Light aiming and
patterns other than those in the standard may be used if the resultant light pattern
produces equivalent light intensities in the areas required by this standard. Use uni-
directional red runway end lights facing toward the runway. When used with HIRL, they
must meet the intensity requirements shown in Figure 4-10. Aim the lights parallel with
the runway centerline and upward at 3 degrees above the horizontal. They must
operate at five intensities as specified in paragraph 4-2.3 for HIRL. Runway end lights
used with MIRL must have reduced intensities compatible with the edge lights and
operate at three intensity steps.
65
Previous Page
