Table 4.2. Rotary-Wing Helipads and Hoverpoints.
Standard IFR helipad.
Area to be free of obstructions. Rough grade and
Grades of Clear
turf when required.
APZ I Length***
Hoverpoints, VFR, and standard IFR.
Army and Air Force IFR same direction
APZ I Width***
Army and Air Force VFR limited use and
Navy and Marine Corps standard VFR.
Army and Air Force standard VFR.
See Table 4.1.
Helipad and Fixed
or Rotary Wing
* Bed of channel may be flat.
** The clear zone area for helipads corresponds to the clear zone land use criteria for fixed-wing airfields as defined
in DoD AICUZ standards. The remainder of the approach-departure zone corresponds to APZ I land use
criteria similarly defined. APZ II criteria is not applicable for rotary-wing aircraft.
*** There are no grading requirements for APZ I.
1. Metric units apply to new airfield construction and where practical modification to existing airfields and heliports,
as discussed in paragraph 1.4.4.
2. The criteria in this manual are based on aircraft specific requirements and are not direct conversions from inch-
pound (English) dimensions. Inch-pound units are included only as a reference to the previous standard.
3. Airfield and heliport imaginary surfaces and safe wingtip clearance dimensions are shown as a direct conversion
from inch-pound to SI units.
4.4.6. Layout Criteria. Layouts for standard, limited use, and IFR helipads, including clear zones, are
illustrated in Figures 4.4 through 4.6.
4.5. Same Direction Ingress/Egress. Helipads with same direction ingress/egress allow a helicopter pad
to be located in a confined area where approach-departures are made from only one direction. The
approach may be either VFR or IFR. For USAF, Single Direction Ingress/Egress VFR Limited use
helipads are configured as shown in Figure 4.7 using the criteria given in Tables 4.2 and 4.7.