UFC 3-535-01
17 November 2005
3-5.3.3
Runway Alignment Indicator Lights (RAIL)
The RAIL consists of five single SFL on the runway centerline in the approach area of
the centerline barrette lights. These lights are capacitor-discharge, uni-directional, white,
elevated lights which are flashed in sequence from the approach end towards the
runway thresholds. Locate the SFLs between 480 meters and 800 meters (1,600 feet
and 2,400 feet) from the runway threshold, spaced at 60 meters (200 feet) apart.
Figure 3-9. MALSR Configuration
RUNWAY
CENTERLINE
60 M 6 M
(200 FT 20 FT)
RUNWAY THRESHOLD
2+00
LEGEND:
STEADY-BURNING
SEMIFLUSH IN PAVED
UNIDIRECTIONAL
OVERRUNS
WHITE LIGHT
300 M 6 M
120V 120W PAR-38,
(1000 FT 20 FT)
TYPE 120PAR/SP
8M
7M
1000 FT BAR
ENERGY SAVER, OR
(28 FT)
(23FT)
120V 150W PAR-38,
420 M 6 M
TYPE 150PAR/SP
(1400 FT 20 ft)
RAIL SFL,
3 M (10 FT)
FAA TYPE L-849,
STYLE E OR
FAA-E-2628
CENTERLINE
720 M 6 M
BARRETTE
(2400 FT 20 FT)
12 LIGHT STATIONS
@ 60M 6M
(200 FT 20 FT)
RAIL SFL LIGHT
SPACING
3-5.4
Photometrics
The color of the steady-burning lights must be aviation white for the centerline and 300
meter (1,000 foot) crossbar lights. The color of SFL may be aviation white or bluish-
white, similar to xenon gas discharge lights. The intensity steps based on rated intensity
must be 100 percent for high setting, 20 percent for medium setting, and 4 percent for
low setting for the steady burning centerline and 30 meter (100 foot) crossbar lights; and
100 percent for high setting, 10 percent for medium setting, and 2 percent for low
setting for the SFL. The SFL must flash in sequence from the outer end toward the
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