UFC 3-535-01
17 November 2005
RGLs provide a distinctive warning to anyone approaching the runway holding position
that they are about to enter an active runway.
5-5.2
Configuration
Elevated and in-pavement RGLs serve the same purpose and are not generally both
installed at the same runway holding position. However, if snow could obscure in-
pavement RGLs or there is an acute angle between the holding position and the
direction of approach to the holding position, it may be advantageous to supplement in-
pavement RGLs with elevated RGLs. Each elevated RGL fixture consists of two
alternately illuminated uni-directional yellow lights. In-pavement RGLs consist of a row
or alternately illuminated uni-directional yellow lights.
5-5.3
Location of In-pavement Runway Guard Lights
In-pavement RGLs are centered on an imaginary line that is parallel to, and 610
millimeters (2 feet) from, the holding side of the runway holding position marking. The
lights may vary from this imaginary line up to 50 millimeters (2 inches) in a direction
perpendicular to the holding position marking. If a conflict with rigid pavement joints
occurs, the RGLs may be moved away from the runway the minimum distance required
to resolve the conflict.
5-5.3.1
Lateral Spacing Preferred Method
The lights are spaced across the entire taxiway, including fillets and holding bays, on
intervals of 3 meters (9 feet, 10 inches), 50 millimeters (2 inches), center-to-center.
The lights are spaced in relation to a reference fixture that is installed in-line
(longitudinally) with existing or planned taxiway centerline lights. However, it is not
intended that the reference fixture replace a taxiway centerline light. If a conflict
between the reference fixture and a centerline light occurs, the reference fixture may
take the place of an existing centerline light and a new centerline light should be
installed in accordance with the criteria in paragraph 3c of FAA AC 150/5340-28. If the
holding position marking is intersected by multiple taxiway centerline markings, the
reference fixture should be set at the centerline. A fixture whose outboard edge falls at a
point less than 610 millimeters (2 feet) from the defined edge of the taxiway (outboard
edge of the taxiway marking) may be omitted. Individual fixtures may be moved laterally
maximum of 305 millimeters (1 foot) in order to avoid undesirable spots, i.e. conduit.
NOTE: Generally, undesirable spots must be avoided by a total of 610 millimeters (2
feet). If this cannot be met by applying the aforementioned 305 millimeter (1 foot)
tolerance, then the following alternate method should be used.
5-5.3.2
Lateral Spacing Alternate Method
The following alternate method of spacing the lights should be followed if it is not
possible to meet the preferred method specified in paragraph 4b(1) of FAA AC
150/5340-28. The lights are spaced across the entire taxiway, including fillets and
holding bays. If it is possible to meet paragraph 4b(1) requirements by allowing the
reference fixture to be moved any amount laterally, then that method should be used.
Otherwise, the lights should be spaced as uniformly as possible with a minimum
spacing of 2.4 meters (8 feet) and a maximum of 4 meters (13 feet).
5-5.3.3
Light Beam Orientation for In-pavement RGLs
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