UFC 3-535-01
17 November 2005
3-5
MEDIUM INTENSITY APPROACH LIGHT SYSTEM WITH RUNWAY
ALIGNMENT INDICATOR LIGHTS (MALSR)
3.5.1
Purpose
The MALSR is a medium intensity approach light system with sequenced flashing lights
used for runway alignment. This system provides visual approach area identification,
centerline alignment, and roll reference for aircraft making approaches for landings
during day or night operations. This configuration is FAA approved for ILS Category I
approaches, but requires a waiver to be installed on an Air Force base. See paragraph
1-10.
3-5.2
Associated Systems
In addition to electronic aids such as ILS, which provide electronic guidance down to a
minimum of not less than 60 meters (200 feet) Category I condition, the MALSR should
include the following:
3-5.2.1
Non-precision or precision approach instrument runway markings.
3-5.2.2
High-intensity Runway edge Lights (HIRL).
3-5.2.3
Threshold lights or displaced threshold lights.
3-5.2.4
Precision Approach Path Indicator (PAPI).
3-5.3
Configuration
The MALSR is a system of light bars, barrettes, and Sequenced Flashing Lights (SFL)
in the approach zone immediately ahead of the runway threshold. The length of a
MALSR is 720 meters (2,400 feet). The plan of the MALSR is shown in Figure 3-9 and
the schedule of lighting equipment is given in Chapter 13. The MALSR consists of
centerline light barrettes, 300 meter (1,000 foot) crossbar, and the Runway Alignment
Indicator Lights (RAIL). In the MALSR, a barrette is 5 lights closely spaced in a
transverse line for which the length must not exceed 3 meters (10 feet) with the center-
to-center spacing of the lights 0.75 meters (2.5 feet).
3-5.3.1
Centerline Light Barrettes
The centerline lights consist of seven 5-light barrettes of steady-burning, uni-directional,
white, elevated lights. For runways with displaced thresholds or paved overruns, the
centerline lights on the runway and overrun must be in-pavement. Normal configuration
is 60 meters (200 feet) spacing starting 60 meters (200 feet) from the threshold and
extending to 420 meters (1,400 feet).
3-5.3.2
300 Meter (1,000 Foot) Crossbar
This crossbar consists of two barrettes in aviation white lights located symmetrically
about and perpendicular to the system centerline at station 10+00 and in line with the
centerline barrette at that station. Each barrette consists of 5 lights on 0.75 meter (2.5
foot) spacing with the innermost light located 7 meters (23 feet) from the system
centerline. Lights located in paved areas must be in-pavement type.
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