UFC 3-535-01
17 November 2005
order to provide clear, non-conflicting direction to taxiing pilots. It is recommended that
the appropriate local engineering function maintain, and update as required, a master
sign plan for the complete airfield.
9-5.2
Following are general signing conventions to be followed for all airfields:
9-5.2.1
Signs should always be placed on the left side of a taxiway as seen by the
pilot of approaching aircraft. Exceptions are:
9-5.2.1.1
Where signs are placed on both sides of a surface (for example, at wide
throat entrances to intersections).
9-5.2.1.2
Where a sign may be placed on the back of a left-handed sign for traffic in
the other direction (such as a location or boundary sign on the back of a mandatory hold
sign).
9-5.2.1.3
Where a destination sign might be placed at the top of a "T" at a "T"
intersection.
9-5.2.1.4
Where necessary for clearance requirements.
9-5.2.1.5
Where it is impractical to install on the left because of terrain or conflicts
with other objects.
9-5.2.2
If signs are installed on both sides of a taxiway at the same location, the
sign faces should be identical. An exception is for holding position signs, where a
location sign in the array should always be outboard of the mandatory sign.
9-5.2.3
All direction signs have arrows. Arrows on signs should be oriented to
approximate the direction of the turn. Each designation on an array of direction signs
should be accompanied only by one arrow. An exception is when an intersection has
only two taxiways where it is permissible to have the designation of the cross taxiway
with arrows both ways.
9-5.2.4
Location signs are typically included as part of a direction sign array. The
location sign is placed so that the designations for all turns to the left are on the left of
the location sign, and all turns to the right or straight ahead (if used) are on the right of
the location sign. A location sign installed together with a mandatory sign is always
located outboard of the mandatory sign.
9-5.2.5
A direction sign with an arrow indicating a taxiway continues straight
ahead (25 degrees or less change in alignment) is usually not needed, unless the
designation of the taxiway changes at the intersection.
9-5.2.7
Information signs should not be collocated with mandatory, location,
direction, or destination signs.
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