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. 

