UFC 3-535-01
17 November 2005
3-1.4.6.8
Light stations must be installed within 150 millimeters (6 inches) of the
station designation.
3-1.5
Power Requirements
Provide a main and on-site standby power system with automatic transfer within 15
seconds of a failure of the power system in use. Do not locate the power and control
substation or the standby power equipment within the approach light area, shown in
Figure 3-4.
3-1.6
Control Requirements
Provide remote on and off and five-step intensity control for the steady burning lights.
Provide new systems or systems receiving major upgrades with the capability of being
electrically switched from the ALSF-1 configuration to the SSALR configuration
described in paragraph 3-4. Provide a selector switch in the control tower to switch from
ALSF-1 to SSALR.
3-1.7
Monitoring Requirements. Monitoring is required if the runway will be
used when the RVR is below 720 meters (2,400 feet).
3-1.8
Equipment
See paragraph 13-9.1 for typical ALSF-1 components.
3-1.8.1
Fixtures
Use in-pavement fixtures in paved overruns and in displaced thresholds, or where they
are subject to damage by jet blast. No part of the unit must extend more than 25
millimeters (1 inch) above surrounding pavement. All other fixtures must be elevated
and capable of being aimed as required by the standard.
3-1.8.2
Fixture Support
Support elevated fixtures on frangible, low-impact resistant, or semi-frangible supports
depending on the required mounting height:
Mounting Height
Support Type
0-2 meters (0-6 ft)
Frangible
2-12 meters (6-40 ft)
Low Impact Resistant
12+ meters (40+ ft)
Semi-frangible
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