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2 rotor diameters.
4.1.2 b) 2) The U.S. precision instrument approach surface flares from a width of 2 rotor diameters to a width
of 1,800 meters at the 7,500 meters outer end. The U.S. does not use a note similar to the one that
follows 4.1.4, as it does not differentiate between helicopter requirements on the basis of operational
performance.
4.1.5 The outer limit of the U.S. transitional surfaces adjacent to the take−off and landing area is
76 meters from the centerline of the VFR approach/departure surfaces. The transitional surface
width decreases to zero at a point 1,220 meters from the take−off and landing area. It does not
terminate at an inner horizontal surface or at a predetermined height.
4.1.6 The U.S. transitional surfaces have a fixed width, 76 meters less the width of the take−off and
landing area, from the approach centerline for visual operations and an outwardly flaring width to
450 meters for precision instrument operations. The U.S. does not use an inner horizontal surface
nor terminate the transitional surfaces at a fixed/predetermined height.
4.1.7 b) Since the U.S. includes the safety area in the take−off and landing area, the comparable elevation is
at the elevation of the FATO.
4.1.9 through
4.1.20
The U.S. does not use the inner horizontal surface, the conical surface, or take−off climb surface
described in these paragraphs or the note following paragraph 4.1.20 for heliport design.
4.1.21 through
4.1.25
The U.S. does not have alternative criteria for floating or fixed−in−place helidecks.
4.2 The U.S. has no requirement for a note similar to the one following the heading ‘‘Obstacle
limitation requirements.’’
4.2.1 The U.S. criteria does not require a take−off climb surface or a conical obstacle limitation surface to
establish a precision instrument approach procedure.
4.2.2 The U.S. criteria does not require a take−off climb surface or a conical obstacle limitation surface to
establish a non−precision instrument approach procedure.
4.2.3 The U.S. criteria does not require a take−off climb obstacle limitation surface to establish a
non−instrument approach procedure.
4.2.4* The U.S. has no requirement for protective surfaces such as an inner horizontal surface or a conical
surface.
4.2.5 The U.S. does not have tables for heliport design comparable to the ICAO Tables 4−1 to 4−4.
4.2.6 The U.S. subscribes to the intent of this paragraph to limit object heights in the heliport protective
surfaces but uses fewer surfaces with different dimensions for those surfaces.
4.2.7* The U.S. subscribes to the intent of this paragraph but uses different dimensional surfaces.
4.2.8 The U.S. criterion requires that a heliport have at least one approach and departure route and
encourages multiple approaches separated by arcs of 90 to 180 degrees.
4.2.9* The U.S. has no requirement that a heliport’s approach surfaces provide 95 percent usability.
31 JULY 08
AIP
United States of America
GEN 1.7−60
15 MAR 07
Nineteenth Edition Federal Aviation Administration
4.2.10 Since the U.S. does not differentiate between surface level and elevated heliports, the comments to
paragraphs 4.2.1 through 4.2.5 above apply.
4.2.11 The U.S. has no requirement for a take−off climb surface. It does require at least one
approach/departure surface and encourages that there be as many approaches as is practical
separated by arcs of 90 to 180 degrees.
4.2.12 through
4.2.22
Since the U.S. does not have alternative design criteria for helidecks or shipboard heliports, there
are no comparable U.S. protective surface requirements.
Tables 4−1, 4−2,
4−3, 4−4
The U.S. does not have tables comparable to the ICAO Tables 4−1 to 4−4.
Chapter 5 Visual Aids
5.2.1 The U.S. does not have criteria for markings to be used in defining winching areas.
5.2.3.3 The U.S. maximum mass markings are specified in 1,000 pound units rather than tonnes or
kilograms.
5.2.4.3 The U.S. criterion requires FATO markers but is not specific on the number or spacing between
markers.
5.2.4.4 The U.S. criteria for FATO markers is not dimensionally specific.
5.2.6 The U.S. does not require, or have criteria for, marking an aiming point.
5.2.7.1 The U.S. does not require specific criteria for marking floating or off−shore fixed−in−place
helicopter or helideck facilities.
5.2.8 The U.S. does not require marking the touchdown area.
5.2.9 The U.S. does not have criteria for heliport name markings.
5.2.10 The U.S. does not have a requirement to mark helideck obstacle−free sectors.
　
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