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AIM
4/3/14
4−3−8
Airport Operations
Zone (RPZ) may reduce a runway’s declared
distances to less than the physical length of the
runway at geographically constrained airports (See
FIG 4−3−5). When considering the amount of
runway available for use in takeoff or landing
performance calculations, the declared distances
published for a runway must always be used in lieu
of the runway’s physical length.
REFERENCE
−
AC 150/5300
−13, Airport Design.
(d)
While some runway elements associated
with declared distances may be identifiable through
runway markings or lighting (for example, a
displaced threshold or a stopway), the individual
declared distance limits are not marked or otherwise
identified on the runway. An aircraft is not
prohibited
from operating beyond a declared
distance limit during the takeoff, landing, or taxi
operation provided the runway surface is appropri-
ately marked as usable runway (See FIG 4−3−5). The
following examples clarify the intent of this
paragraph.
REFERENCE
−
AIM, Runway Markings, Paragraph 2
−3−3.
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.
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