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the runway. Although the runway lights in the area
between the old threshold and new threshold will not
be illuminated, the runway markings in this area may
or may not be obliterated, removed, or covered.
AIP
United States of America
AD 1.1−13
15 MAR 07
Federal Aviation Administration Nineteenth Edition
17.3.8.2Displaced Threshold.A displaced threshold
is a threshold located at a point on the runway
other than the designated beginning of the runway.
Displacement of a threshold reduces the length of
runway available for landings. The portion of runway
behind a displaced threshold is available for takeoffs
in either direction and landings from the opposite
direction. A ten−foot wide white threshold bar is
located across the width of the runway at the
displaced threshold. White arrows are located along
the centerline in the area between the beginning of the
runway and displaced threshold. White arrowheads
are located across the width of the runway just prior
to the threshold bar, as shown in FIG AD 1.1−14.
NOTE−
Airport operator. When reporting the relocation or
displacement of a threshold, the airport operator should
avoid language which confuses the two.
17.3.9Demarcation Bar.A demarcation bar delineates
a runway with a displaced threshold from a blast
pad, stopway, or taxiway that precedes the runway. A
demarcation bar is 3 feet (1 m) wide and yellow, since
it is not located on the runway. (See FIG AD 1.1−15.)
17.3.10Chevrons.These markings are used to
show pavement areas aligned with the runway that
are unusable for landing, takeoff, and taxiing.
Chevrons are yellow. (See FIG AD 1.1−16).
17.3.11Runway Threshold Bar.A threshold bar
delineates the beginning of the runway that is
available for landing when the threshold has been
relocated or displaced. A threshold bar is 10 feet
(3m) in width and extends across the width of the
runway, as shown in FIG AD 1.1−14.
18. Taxiway Markings
18.1General.All taxiways should have centerline
markings and runway holding position markings
whenever they intersect a runway. Taxiway edge
markings are present whenever there is a need to
separate the taxiway from a pavement that is not
intended for aircraft use or to delineate the edge of the
taxiway. Taxiways may also have shoulder markings
and holding position markings for Instrument
Landing System/Microwave Landing System
(ILS/MLS) critical areas, and taxiway/taxiway
intersection markings.
18.2Taxiway Centerline.
18.2.1Normal Centerline.The taxiway centerline
is a single continuous yellow line, 6 inches (15 cm) to
12 inches (30 cm) in width. This provides a visual cue
to permit taxiing along a designated path. Ideally, the
aircraft should be kept centered over this line during
taxi. However, being centered on the taxiway
centerline does not guarantee wingtip clearance with
other aircraft or other objects.
18.2.2Enhanced Centerline.At some airports,
mostly the larger commercial service airports, an
enhanced taxiway centerline will be used. The
enhanced taxiway centerline marking consists of a
parallel line of yellow dashes on either side of the
normal taxiway centerline. The taxiway centerlines
are enhanced for a maximum of 150 feet prior to a
runway holding position marking. The purpose of
this enhancement is to warn the pilot that he/she is
approaching a runway holding position marking and
should prepare to stop unless he/she has been cleared
onto or across the runway by ATC.
(See FIG AD 1.1−17.)
18.3Taxiway Edge Markings.Taxiway edge
markings are used to define the edge of the taxiway.
They are primarily used when the taxiway edge does
not correspond with the edge of the pavement. There
are two types of markings depending upon whether
the aircraft is suppose to cross the taxiway edge:
18.3.1Continuous Markings.These consist of a
continuous double yellow line, with each line being
at least 6 inches (15 cm) in width spaced 6 inches
(15cm) apart. They are used to define the taxiway
edge from the shoulder or some other abutting paved
surface not intended for use by aircraft.
18.3.2Dashed Markings.These markings are used
when there is an operational need to define the edge
of a taxiway or taxilane on a paved surface where the
adjoining pavement to the taxiway edge is intended
for use by aircraft; e.g., an apron. Dashed taxiway
edge markings consist of a broken double yellow line,
with each line being at least 6 inches (15 cm) in width,
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