UFC 3-535-01
17 November 2005
intersecting runway or ILS critical area. Coordinate this distance with Airfield
Management and Flight Safety Offices. On taxiways in approach areas, the sign is
installed where an aircraft would cross the runway safety area or penetrate the required
airspace for approaches and departures.
9-2.2.3
Mandatory signs may be FAA Size 1, 2 or 3. Size 3 signs are
recommended for Category I facilities and higher. From edge of runway or taxiway,
locate a Size 3 sign 11-18 meters (35-60 feet), a Size 2 sign 6-11 meters (20-35 feet),
and a Size 1 sign 3-6 meters (10-20 feet). The distance indicated is to the inside edge
of a sign. Signs are oriented perpendicular to the runway or taxiway centerline, but may
be canted up to 15 degrees to increase visibility if the sign is not a double-face sign. At
locations where large wingspan aircraft operations are common, place signs far enough
from taxiway edges to allow required wingtip clearance.
9-2.2.4
Mandatory signs may be grouped in an array with a location sign, or may
have a location sign or a Safety Area/Obstacle Free Zone (OFZ) or ILS Critical Area
boundary sign on the back face. Direction or destination signs may not be grouped with
a mandatory sign. In an array, the location sign is always positioned outboard of the
mandatory sign. See FAA 150/5340-18 and associated SAMS for further guidance on
grouping several sign messages in an array.
9-2.3
Characteristics
See Chapter 13 and FAA 150/5345-44 for additional characteristic information.
9-2.3.1
Message
Signs are either single face or double face, internally lighted, with retro-reflective
message faces that meet the color and reflectivity requirements of ASTM D 4956,
Sheeting Retroreflective, for Traffic Control, Type I Sheeting. The spacing, stroke, and
shape of legend characters, numerals, and symbols must be in accordance with FAA
AC 150/5345-44, Appendices 1 and 2.
9-2.3.2
Dimensions
See FAA 150/5345-44 Tables 1 and 2 for sign and legend height dimensions. As an
example, an FAA Size 3 sign has a legend height of 460 millimeters (18 inches), legend
panel height of 760 millimeters (30 inches), overall sign mounting height of 910-1070
millimeters (36-42 inches), maximum overall sign length of 2134 millimeters (170
inches), and minimum sign length of 1067 millimeters (42 inches).
9-2.3.3
Electrical
Lighted signs can be powered from a 120-volt AC power source (FAA Style 1), a 3-step
6.6 amperes series circuit (FAA Style 2), a 5-step 6.6 or 20 amperes series circuit (FAA
Style 3), or a dedicated 5.5 amperes series circuit (FAA Style 5). Unlighted signs are
FAA Style 4. For multiple-step series lighting circuits, the sign must provide luminance
within the allowable ranges over all the intensity steps. Signs are connected to series
circuits with an isolation transformer, and must be provided with breakaway cable
connectors installed within the frangible coupling portion of the sign's mounting. Styles
2, 3, and 5 signs must be compatible with all FAA L-828/829 constant current
regulators.
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