TaxiwayTaxi Route Widths. The Paved Taxiway Markings. The centerline Unpaved Taxiway Markings. The

207. TAXIWAYS AND TAXI ROUTES. Taxiways and taxi routes should be provided for the movement

of helicopters from one part of a landing facility to another. They provide a connecting path between the FATO and a parking area. They also provide a maneuvering aisle within the parking area. A taxi route includes the taxiway plus the appropriate clearances needed on both sides. The relationship between a taxiway and a taxi route is illustrated in Figures 2-10, 2-11, and 2-12. NOTE: At PPR heliports with no parking or refueling area outside the TLOFs, no taxi route or taxiway is required.

a. TaxiwayTaxi Route Widths. The

dimensions of taxiways and taxi routes are a function of helicopter size, taxiwaytaxi route marking, and type of taxi operations ground taxi versus hover taxi. These dimensions are defined in Table 2-2. NOTE: Normally, the requirement for hover taxi dictates the taxiwaytaxi route widths. However, when the fleet comprises a combination of large ground taxiing helicopters and smaller air taxiing helicopters, the larger aircraft may dictate the taxiwaytaxi route widths. If wheel-equipped helicopters taxi with wheels not touching the surface, the facility should be designed with hover taxiway widths rather than ground taxiway widths.

b. Paved Taxiway Markings. The centerline

of a taxiway should be marked with a continuous 6- inch 15 cm yellow line. Both edges of the paved portion of the taxiway should be marked with two continuous 6- inch wide 15 cm yellow lines spaced 6 inches 15 cm apart. Figure 2-10 illustrates taxiway centerline and edge markings.

c. Unpaved Taxiway Markings. The

centerline should be marked with in-ground flush markers. They should be longitudinally spaced at approximately 15-feet 5 m intervals on straight segments and at approximately 10-feet 3 m intervals on curved segments. Edge markers should also be used to provide strong visual cues to pilots. Edge markers may be either raised or in-ground flush markers. They should also be longitudinally spaced at approximately 15-feet 5 m intervals on straight segments and at approximately 10-feet 3 m intervals on curved segments. Figures 2-11 and 2-12 illustrate taxiway centerline and edge markings. 1 In-ground, flush centerline markers should be yellow in color, 6 inches 15 cm wide, and approximately 5 feet 1.5 m long. 2 Raised-edge markers should be yellow- blue-yellow in color, 4 inches 10 cm in diameter, and 10 inches 25 cm high, as illustrated in Figure 2-13. 3 In-ground, flush edge markers should be yellow in color, 12 inches 30 cm wide, and approximately 5 feet 1.5 m long. NOTE: Where the visibility of the centerline marking can not be guaranteed at all times, such as locations where snow or dust commonly obscure the centerline marking and it is not practical to remove it, centerline marking is still recommended. However, under such circumstances, the minimum taxiwaytaxi route dimensions should be determined as if there was no centerline marking see Table 2-2. NOTE: Elevated centerline markers are NOT recommended because they present an obstruction hazard.

d. Raised Edge Markers in Grassy Areas.