UFC 3-535-01
17 November 2005
inches) above grade. Where there are frequent snow accumulations of 0.30 meters (12
inches) or more, the mounting height may be increased to 0.76 meters (30 inches).
5-1.5.1
Size the fixture base which supports the elevated fixture and houses the
isolation transformer to accept an in-pavement fixture. This facilitates future runway and
taxiway configuration changes or modifications where an elevated fixture may not be
suitable.
5-1.5.2
To reduce the "sea of blue lights" effect at an airfield that has many taxi
routes, hoods may be used on elevated fixtures. Do not use hoods on entrance or exit
light fixtures.
5-1.5.3
Where elevated lights may be damaged by jet blast or operation of an
arresting gear, or where they interfere with aircraft operation such as B-52 outrigger
gears, use in-pavement fixtures. See paragraph 13-11.1 for applicable fixtures used.
5-1.6
Power Requirements
Provide a main power system and circuits which permit independent control of the
taxiways. Provide standby power only for those taxiways supporting precision
instrument approaches. Transfer time from the failed power system must not exceed 15
seconds.
5-1.7
Control Requirements
Taxiway lighting circuits must be segmented and controlled to provide the degree of
flexibility required for airfield operations. (See Figure 5-4.) Provide remote on/off control
for all taxiway segments, and provide a three step intensity control.
5-1.8
Monitoring Requirements
There is no requirement for monitoring taxiway circuits.
5-1.9
Compliance with International Standards
5-1.9.1
ASCC
These standards meet the requirements of AIR STD 90/27, except for the light spacing
on curves.
5-1.9.2
NATO
These standards meet the requirements of STANAG 3316 except for the light spacing
on curves.
5-2
TAXIWAY CENTERLINE LIGHTS
5-2.1
Purpose
Taxiway centerline lights are a system of aviation green in-pavement lights installed
along the taxiway centerlines to provide alignment and course guidance information that
supplement edge lighting. They may be installed where it is impractical to install taxiway
edge lights. However, they are optional at airfields designed for Category II and required
at airfields designed for Category III operations, on the taxiways which support these
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