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AIM

10/12/17

2−3−25

Airport Marking Aids and Signs

FIG 2−3−34

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 2−3−34. 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.”

2−3−10. 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 accompa-

nied 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 2−3−35.

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 2−3−36 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 2−3−35.)

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 2−3−35.)

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 2−3−37. In this case, the location sign is located

to the left of the direction sign.