Attachment 1
Helicopter Parking Space, Type 1 (Army Only)--In this configuration, rotary-wing aircraft are
parked in a single lane, which is perpendicular to the taxilane.
Helicopter Parking Space, Type 2 (Army Only)--In this configuration, rotary-wing aircraft are
parked in a double lane, which is parallel to the taxilane.
Helicopter Runway--A prepared surface used for the landing and takeoff of helicopters requiring a
ground run.
Helipad--A prepared area designated and used for takeoff and landing of helicopters (includes
touchdown and hoverpoint.)
Helipad, IFR--A helipad designed for Instrument Flight Rules. IFR design standards are used when an
instrument approach capability is essential to the mission and no other instrument landing facilities,
either fixed-wing or rotary-wing, are located within an acceptable commuting distance to the site.
Helipad, Limited Use--A VFR rotary wing facility for use by AH, OH, and UH helicopters. These
type helipads support only occasional operations at special locations such as hospitals, headquarters
facilities, missile sites, and other similar locations. They may also be located on airfields where one or
more helipads are required to separate operations of helicopters such as OH, UH, and AH) from fixed-
wing or other helicopter operations.
Heliport--A facility designed for the exclusive operating, basing, servicing and maintaining of rotary-
wing aircraft (helicopters). The facility may contain a rotary-wing runway and/or helipads.
Heliport or Helipad Elevation--The established elevation, in terms of the nearest 300 mm (one foot)
above mean sea level, based on the highest point of the usable landing area.
High-Speed Taxiway Turnoff--A taxiway leading from a runway at an angle which allows landing
aircraft to leave a runway at a high speed.
Holding Position--A specified location on the airfield, close to the active runway and identified by
visual means, at which the position of a taxiing aircraft is maintained in accordance with air traffic
control instructions.
Horizontal Surfaces, Fixed-Wing:
Inner Horizontal Surface--An imaginary plane 45.72 m (150 ft) above the established airfield
elevation. The inner boundary intersects with the approach-departure clearance surface and the
transitional surface. The outer boundary is formed by scribing arcs with a radius 2,286.0 m (7,500 ft)
from the centerline of each runway end, and interconnecting those arcs with tangents.
Outer Horizontal Surface--An imaginary plane 152.4 m (500 ft) above the established airfield
elevation extending outward from the outer periphery of the conical surface for a horizontal distance of
9,144.0 m (30,000 ft).
Horizontal Surface, Rotary-Wing--An imaginary plane at 45.72 m (150 ft) above the established
heliport or helipad elevation. The inner boundary intersects with the approach-departure clearance
surface and the transitional surface. The outer boundary is formed by scribing an arc at the end of each
runway, and connecting the arcs with tangents, or by scribing the arc about the center of the helipad.
See Chapter 4 for dimensions.
Hover--A term applied to helicopter flight when the aircraft: (1) maintains a constant position over a
selected point (1 m to 3 m [3 ft to 10 ft] above ground), and (2) is taxiing (airborne) (1 m to 3 m [3 ft to
10 ft] above ground) from one point to another.
A1-14
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