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AIM 

6/17/21 

provided the runway surface is appropriately marked 
as usable runway (See FIG 4

3

6). The following 

examples clarify the intent of this paragraph. 

REFERENCE

 

AIM, Paragraph 2

3

3 , Runway Markings 

AC 150/5340

1, Standards for Airport Markings 

EXAMPLE

 

1. 

The declared LDA for runway 9 must be used when 

showing compliance with the landing distance require-
ments of the applicable airplane operating rules and/or 
airplane operating limitations or when making a before 
landing performance assessment. The LDA is less than the 
physical runway length, not only because of the displaced 

threshold, but also because of the subtractions necessary 
to meet the RSA beyond the far end of the runway. However, 
during the actual landing operation, it is permissible for 
the airplane to roll beyond the unmarked end of the LDA. 

2. 

The declared ASDA for runway 9 must be used when 

showing compliance with the accelerate

stop distance 

requirements of the applicable airplane operating rules 
and/or airplane operating limitations. The ASDA is less 
than the physical length of the runway due to subtractions 
necessary to achieve the full RSA requirement. However, in 
the event of an aborted takeoff, it is permissible for the 
airplane to roll beyond the unmarked end of the ASDA as 
it is brought to a full

stop on the remaining usable runway. 

4

3

10 

Airport Operations