UFC 3-535-01
17 November 2005
horizontal. Ideally, all the lights will be installed in a single horizontal plane at the same
elevation as the runway threshold without any penetrations by fixed solid objects.
Where deviations are necessary for terrain or objects which cannot be removed, the
sections starting from the first approach light station from the threshold must have a
slope not exceeding +2.0 percent upward or -1.0 percent downward for the steady-
burning barrette lights. For the RAIL section, the slope of the light planes must not
exceed +2.0 percent or -2.5 percent. Any sloping or horizontal plane must contain not
less than three light stations.
3-5.5.1.2
No object may penetrate the light plane except for ILS components and
components of airfield lighting systems which are fixed by their function. These
components must not interfere with the pilot's view of the approach lights when on a
normal approach and must be obstruction lighted. For clearance purposes, all roads,
vehicle parking areas and railroads are considered as vertical solid objects. The
required clearance above railroads is 7.5 meters (23 feet) and above interstate
highways is 6 meters (17 feet). The clearance required above other public roads and
parking lots is 5 meters (15 feet). The clearance above private and military roads is 3
meters (10 feet). Airfield service roads, where traffic is controlled, are not considered as
obstructions. Control of the 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 must be in accordance with UFC 3-260-01/ TM 5-803-7, Airfield and Heliport
Planning Design.
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