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Relocation of a Threshold with Markings for Taxiway Aligned with Runway
AIM 2/19/04
2−3−6 Airport Marking Aids and Signs
FIG 2−3−4
Displaced Threshold Markings
2/19/04 AIM
Airport Marking Aids and Signs 2−3−7
i. Demarcation 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 (1m) wide and yellow, since
it is not located on the runway as shown in
FIG 2−3−6.
1. Chevrons. 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 2−3−7.)
j. Runway 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 2−3−4.
FIG 2−3−5
Runway Shoulder Markings
RUNWAY THRESHOLD
MIDPOINT OF
RUNWAY
SHOULDER RUNWAY SHOULDER
45°
45°
45°
45°
2−3−4. Taxiway Markings
a. General. 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.
REFERENCE−
AIM, Holding Position Markings, Paragraph 2−3−5.
b. Taxiway 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 to ensure wing-tip clearance.
(See FIG 2−3−8.)
c. Taxiway 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:
1. Continuous Markings. These consist of a
continuous double yellow line, with each line being
at least 6 inches (15 cm) in width spaced 6 inches
(15 cm) apart. They are used to define the taxiway
edge from the shoulder or some other abutting paved
surface not intended for use by aircraft.
2. Dashed 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, spaced 6 inches (15 cm) apart (edge
to edge). These lines are 15 feet (4.5 m) in length with
25 foot (7.5 m) gaps. (See FIG 2−3−9.)
d. Taxi Shoulder Markings. Taxiways, holding
bays, and aprons are sometimes provided with paved
shoulders to prevent blast and water erosion.
Although shoulders may have the appearance of full
strength pavement they are not intended for use by
aircraft, and may be unable to support an aircraft.
Usually the taxiway edge marking will define this
area. Where conditions exist such as islands or
taxiway curves that may cause confusion as to which
side of the edge stripe is for use by aircraft, taxiway
shoulder markings may be used to indicate the
pavement is unusable. Taxiway shoulder markings
are yellow. (See FIG 2−3−10.)
AIM 2/19/04
2−3−8 Airport Marking Aids and Signs
FIG 2−3−6
Markings for Blast Pad or Stopway or Taxiway Preceding a Displaced Threshold
2/19/04 AIM
Airport Marking Aids and Signs 2−3−9
FIG 2−3−7
Markings for Blast Pads and Stopways
AIM 2/19/04
2−3−10 Airport Marking Aids and Signs
FIG 2−3−8
Taxiway Centerline
TAXIWAY CENTERLINE
YELLOW DASHES & SPACES
COLOR YELLOW
AIRCRAFT
HOLDING
SIDE
TAXIWAY HOLDING
POSITION MARKINGS
FIG 2−3−9
Dashed Markings
DOUBLE
　
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