UFC 3-535-01
17 November 2005
runway threshold at a steady rate between 60 and 120 times per minute. The interval
between flashes of adjacent lights must nominally be 1/30 seconds. The intensity-
distribution of the lights must be as follows:
3-5.4.1
Steady-burning White Lights
The peak intensity for the elevated lights at the rated 120 volts must be not less than
10,000 candelas and the intensity must be not less than 1,000 candelas at any angle up
to 15 degrees from the beam axis. For the in-pavement lights, the peak intensity must
be not less than 5,000 candelas with the beam spread from the beam axis at 2500
candelas not less than 5 degrees horizontally and 3.5 degrees vertically and at 500
candelas not less than 7 degrees horizontally and 5.5 degrees vertically.
3-5.4.2
Sequenced Flashing Lights (SFL)
The rated effective intensity must be not less than 7,500 candelas or more than 22,500
candelas for 15 degrees horizontally and 5 degrees vertically from the beam axis.
3-5.5
Aiming Criteria
Aim the beams of all approach lights into the approach zone and away from the
threshold with the axis of the beams parallel in azimuth to the extended runway
centerline. Aim the elevated lights vertically in accordance with Table 3-2. The in-
pavement lights have fixed elevation angles for the beams, and only require that the
light base flange be level.
Table 3-2. Elevation Setting Angles for MALSR
ELEVATED UNI-DIRECTIONAL LIGHTS
Steady-Burning Lights
Setting Angle above
Setting Angle above
Horizontal (Degrees)
Horizontal (Degrees)
Station
Station
Preferred
Permitted
Preferred
Permitted
14+00
3.7
3.5
6+00
3.4
3.5
12+00
3.6
3.5
4+00
3.3
3.5
10+00
3.5
3.5
2+00
3.2
3.0
8+00
3.4
3.5
Elevated SFL are all aimed 6 degrees above horizontal.
3-5.5.1
Approach Light Planes
The following restrictions apply for a MALSR installation:
3-5.5.1.1
The approach light plane (Figure 3-10) is an area 120 meters (400 feet)
wide centered on the extended runway centerline which begins at the runway threshold
and extends 60 meters (200 feet) beyond the outermost light in which the approach light
centers are located. All lines in the planes perpendicular to the runway centerline are
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