UFC 3-535-01
17 November 2005
service road traffic must be accomplished by appropriate signs or directly by the control
tower; parking or stopping is prohibited between the signs. The Airfield Commander
must approve the means of control and the wording of signs. It is preferred to get the
needed clearance above a road, rather than controlling the traffic so the clearance is not
necessary. Obstructions beyond the approach light system will be in accordance with
UFC 3-260-01, Airfield and Heliport Planning Design.
3-1.4.5
Configuration Adjustments
Siting considerations may require adjustment of the approach light system
configuration. The following adjustments are permissible without a waiver:
3-1.4.5.1
System Centerline
The system centerline may be offset laterally a distance of not more than 0.6 meters (2
feet) to maintain alignment with runway centerline lights or to avoid installation
problems.
3-1.4.5.2
Light Station Adjustments
To avoid roads, buildings, railroads, or other obstacles, it may be necessary to move a
light station away from its nominal location. Where this is so, change the light bar
spacings to distribute the difference uniformly so the spacing between adjacent light
stations is kept at 30 meters 3 meters (100 feet 10 feet) and the system length is
maintained.
3-1.4.6
Construction Tolerances
The tolerances for positioning ALSF-1 and ALSF-2 lights are as follows:
3-1.4.6.1
Light stations must be installed longitudinally within 150 millimeters (6
inches) of the designated location.
The lateral tolerance for installation of a light bar is 75 millimeters (3
3-1.4.6.2
inches).
The tolerance for distance between individual lights is 25 millimeters (1
3-1.4.6.3
inch).
3-1.4.6.4
Mounting heights tolerances are:
Support Height Tolerances
0-2M (0-6 ft)
25 mm (1 in.)
2-12M (6 40 ft)
50 mm (2 in.)
12+ M (40+ ft)
75 mm (3 in.)
3-1.4.6.5
Deviation from a line perpendicular to the Approach Landing System
(ALS) centerline is 25 millimeters (1 inch) maximum.
3-1.4.6.6
Vertical angular alignment of a light must be within 1 degree.
3-1.4.6.7
Horizontal angular alignment of a light must be within 5 degrees.
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