AIM 

4/20/23 

FIG 2

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3

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34 

ILS Critical Area Boundary Sign 

4.  ILS Critical Area Boundary Sign. 

This sign has a yellow background with a black inscription with a 

graphic depicting the ILS pavement holding position marking as shown in FIG 2

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3

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34. This sign is located 

adjacent to the ILS holding position marking on the pavement and can be seen by pilots leaving the critical area. 

The sign is intended to provide pilots with another visual cue which they can use as a guide in deciding when 

they are “clear of the ILS critical area.” 

2

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3

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10.  Direction Signs 

a. 

Direction signs have a yellow background with a black inscription. The inscription identifies the 

designation(s) of the intersecting taxiway(s) leading out of the intersection that a pilot would normally be 

expected to turn onto or hold short of. Each designation is accompanied by an arrow indicating the direction of 

the turn. 

b. 

Except as noted in subparagraph e, each taxiway designation shown on the sign is accompanied by only 

one arrow. When more than one taxiway designation is shown on the sign, each designation and its associated 

arrow is separated from the other taxiway designations by either a vertical message divider or a taxiway location 

sign as shown in FIG 2

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3

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35. 

c. 

Direction signs are normally located on the left prior to the intersection. When used on a runway to indicate 

an exit, the sign is located on the same side of the runway as the exit. FIG 2

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3

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36 shows a direction sign used 

to indicate a runway exit. 

d. 

The taxiway designations and their associated arrows on the sign are arranged clockwise starting from the 

first taxiway on the pilot’s left. (See FIG 2

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3

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35.) 

e. 

If a location sign is located with the direction signs, it is placed so that the designations for all turns to the 

left will be to the left of the location sign; the designations for continuing straight ahead or for all turns to the 

right would be located to the right of the location sign. (See FIG 2

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3

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35.) 

f. 

When the intersection is comprised of only one crossing taxiway, it is permissible to have two arrows 

associated with the crossing taxiway, as shown in FIG 2

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3

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37. In this case, the location sign is located to the left 

of the direction sign. 

2

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3

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30 

Airport Marking Aids and Signs