UFC 3-535-01
17 November 2005
9-2.3.4
Photometrics
The average sign luminance, as determined in accordance with FAA AC 150/5345-44,
must be as follows for all intensity steps: white legend, 10 to 30 foot-lamberts, with 16
to 30 foot-lamberts at the 2 highest intensity steps; red background, 2.9 to 8.8 foot-
lamberts. Further, the ratio of average luminance between white legend and red
background must be no greater than 10:1 and no less than 5:1.
9.2.4
Power and Control. Lighted mandatory signs are typically connected to the
runway edge lighting series circuit for the associated runway. In this way they are turned
on and off with the runway lighting. If the signs are circuited separately or otherwise not
connected to the runway edge lighting, they should be interlocked together in such a
way so as to turn on and off with the runway edge lighting.
9-3
TAXIWAY GUIDANCE AND INFORMATION SIGNS
9-3.1
Purpose
Taxiway guidance signs include direction signs, destination signs, other informational
signs, and boundary signs. Direction signs indicate the direction of taxiways leading out
of an intersection, and are installed at runway exits, taxiway intersections, and other
locations. Destination signs indicate the general direction to a remote location. For
example, outbound destination signs are used to identify the direction to takeoff
runways, while inbound destination signs are used to indicate direction to major areas
such as aprons, fueling points, and other locations. Both direction and destination sign
messages include an arrow. Boundary signs indicate important boundaries such as ILS
critical areas and runway approach areas. Typically boundary signs are not installed at
military airfields, although they are often used at joint military/civil airfields. Other signs
are used to provide specific information such as noise abatement procedures, check
points, and others. Examples of guidance sign messages are shown in Figure 9-2.
9-3.2
Installation
Runway exit signs are installed on the side of the runway exit prior to the intersection.
All other signs are installed on the left side of the taxiway unless special circumstances
require otherwise.
9-3.2.1
A direction sign is installed prior to an intersection. Typically they are
installed at the point of tangency of the taxiway intersection, but not closer than required
for the safe turning of aircraft. Minimum distances from the intersecting taxiway can be
found in FAA AC 150/5340-18 Table 3.
9-3.2.2
Destination signs are not always needed where direction signs are used,
but are helpful where direction signs alone do not adequately guide a pilot to the desired
destination. They may be particularly helpful at uncontrolled airfields. Destination signs
should be located so where they will not cause confusion with direction signs, and are
subject to the same minimum distances from intersecting taxiways. See FAA AC
150/5340-18 for additional guidance.
9-3.2.3
An ILS Critical Area boundary sign is installed at the boundary limit to
indicate where it is clear of the ILS Critical Area. The Air Force will use "INST" instead of
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