UFC 3-535-01
17 November 2005
4-6.5.2
ASCC
These standards meet ASCC AIR STD 90/27, for runway end lights.
4-6.6
Additional Information
See FAA AC 150/5345-46 for more information.
4-7
RUNWAY CENTERLINE LIGHTS (RCL)
4-7.1
Purpose
The runway centerline lights provide lateral guidance during landing, rollout and takeoff
roll under low visibility conditions. They are required for Categories II and III instrument
operations.
4-7.2
Configuration
The runway centerline lighting system is a straight line of lights which runs parallel with
and within 0.6 meters (2 feet) of the runway centerline. Configure the system as shown
in Figure 4-11. The lighting system extends from 22.5 meters (75 feet) of the upwind
end of the runway. It is desirable to offset centerline light fixtures on runways equipped
with aircraft arresting systems to avoid hook-skip problems and damage to the
centerline light fixtures. Up to three fixtures may be omitted in the vicinity of the
arresting gear pendant cables to avoid hook bounce and minimize light damage.
Existing centerline light fixtures within this area should be removed and replaced with
blank cover plates. (See paragraph 13-10.6.)
4-7.3
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 which differ from the standard. Light aiming and
patterns other than those given in the standard may be used if the resultant light pattern
produces equivalent light intensities in the areas required by the standard. The
centerline lights must be bi-directional and emit white light. They must be color coded
on the final 900 meters (3,000 feet) portion. (See Figure 4-12.) The lights must meet the
intensity requirements shown in Figure 4-10. They must be aimed parallel with the
runway centerline and upward at 4.5 degrees. They must operate at 5 intensity steps as
specified in paragraph 4-2 for runway edge lights.
4-7.4
Adjustment and Tolerances
The line of lights may be offset a maximum of 0.6 meters (2 feet) from the runway
centerline to avoid interference with construction joints. Installation tolerance for fixtures
is 0.025 meters (1 inch) from the design location. The mounting surface of the fixture
must be level within 1 degree in any direction and the horizontal must be within 1
degree of that specified.
4-7.5
Equipment
Use in-pavement fixtures with no part protruding more than 0.01 meters (0.5 inch)
above the surrounding surface.
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