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AIM 

6/17/21 

FIG 2

3

28 

Holding Position Sign for ILS Critical Area 

FIG 2

3

29 

Sign Prohibiting Aircraft Entry into an Area 

3. ILS Critical Area Holding Position 

Sign. 

At some airports, when the instrument landing 

system is being used, it is necessary to hold an aircraft 
on a taxiway at a location other than the holding 
position described in Paragraph 2

3

5, Holding 

Position Markings. In these situations, the holding 
position sign for these operations will have the 
inscription “ILS” and be located adjacent to the 
holding position marking on the taxiway described in 
paragraph 2

3

5. An example of this sign is shown 

in FIG 2

3

28. 

4. No Entry Sign. 

This sign, shown in 

FIG 2

3

29, prohibits an aircraft from entering an 

area. Typically, this sign would be located on a 
taxiway intended to be used in only one direction or 
at the intersection of vehicle roadways with runways, 
taxiways, or aprons where the roadway may be 
mistaken as a taxiway or other aircraft movement 
surface. 

NOTE

 

Holding position signs provide the pilot with a visual cue 
as to the location of the holding position marking. 

REFERENCE

 

AIM Paragraph 2

3

5, Holding Position Markings 

2

3

22 

Airport Marking Aids and Signs