UFC 3-535-01
17 November 2005
4-3.4
Equipment
Elevated fixtures must be frangible mounted a maximum of 0.35 meters (14 inches)
above grade. In-pavement fixtures must not protrude more than 0.025 meters (1 inch)
above the surrounding surface. (See paragraph 13-10.2.) In areas of heavy snow,
fixture height may be increased to a maximum of 0.6 meters (24 inches).
4-3.5
Power Requirements
Standby power is not required for medium intensity runway lights, except where they
are installed on the primary runway. When installed on the primary runway, provide a
main and a standby power system with automatic transfer within 15 seconds of failure of
the system in use.
4-3.6
Control Requirements
Provide remote on, off, and brightness control.
4-3.7
Monitoring
There is no requirement for monitoring.
4-3.8
Compliance with International Military Standards
4-3.8.1
ASCC
This system meets ASCC AIR STD 90/27, for lighting of non-instrument runways.
4-3.8.2
NATO
This system does not meet NATO STANAG 3316 for lighting of subsidiary runways.
4-3.9
Additional Information
See FAA AC 150/5345-46 and AC 150/5340-24 for more information.
4-4
THRESHOLD LIGHTS
4-4.1
Purpose
Threshold lights provide positive identification of the beginning of the operational runway
surface for approaching aircraft at night or under instrument weather conditions.
4-4.2
High Intensity Threshold Light Configuration
Install threshold lights in a line perpendicular to the extended runway centerline outside
the usable landing area a distance of not more than 3 meters (10 feet). The line of lights
is symmetrical about the runway centerline and extends 12 meters (40 feet) outboard of
the lines of runway edge lights. (See Figure 4-3 for the Air Force configuration, and
Figure 4-4 for the Army configuration). Determine the position of the lights as follows:
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