Runway, Rotary-wing-- A runway for rolling landings and take-off of rotary-wing aircraft. The
rotary-wing runway allows for a helicopter to quickly land and roll to a stop compared to the hovering
stop used during a vertical helipad approach.
Runway Threshold--A line perpendicular to the runway centerline designating the beginning of that
portion of a runway usable for landing.
Runway Visual Range--The maximum distance in the direction of take-off or landing from which the
runway, or the specified lights or markers delineating it, can be seen from a position above a specified
point on its centerline at a height corresponding to the average eye-level of pilots at touchdown.
Service Point--A receptacle, embedded in certain airfield pavements, containing outlets for utilities
required to service aircraft.
Shoulder--A prepared (paved or unpaved) area adjacent to the edge of an operational pavement.
Slide Area, Helicopter--A specially prepared but usually unpaved area used for practicing helicopter
landings under simulated engine failure or certain other emergency conditions. VFR Helicopter runway
criteria apply to these type facilities. (Also known as a Skid Pad.)
Slope Ratio--A slope expressed in meters [feet] as a ratio of the horizontal to the vertical distance. For
example, 50:1 means 50 meters horizontal to 1 meter vertical [50 feet horizontal to 1 foot vertical].
Standard VFR Helipad--A helipad designed to Visual Flight Rules (VFR). VFR design standards are
used when no requirement exists or will exist in the future for an IFR helipad.
Standby Parking Pad--At individual helipad sites where it is necessary to have one or more
helicopters on standby, an area adjacent to the helipad, but clear of the landing approach and transitional
Suppressed Power Check Pad--A suppressed power check pad is an enclosed power check pad,
referred to as a "hush house," where full power checks of jet engines are performed.
Takeoff and Landing Area--A specially prepared or selected surface of land, water, or deck
designated or used for takeoff and landing of aircraft.
Takeoff Safety Zone--A clear graded area within the approach-departure zone of all VFR rotary-wing
facilities. The land use of this area is comparable to the clear zone area applied to fixed-wing facilities.
Taxilane--A designated path marked through parking, maintenance or hangar aprons, or on the
perimeter of such aprons to permit the safe ground movement of aircraft operating under their own
Taxilane, Interior (secondary taxi routes)--A taxilane which provides a secondary taxi route to
individual parking positions or a hangar and is not intended or used as a primary taxi route for through
Taxilane, Peripheral-- A taxilane located along the periphery of an apron that may be considered a
primary or a secondary taxi route. Provide wing tip clearance commensurate with the intended use. See
Taxilane, Interior, Taxilane, Through, and Table 6.1, Items 5 and 6.
Taxilane, Through (primary taxi routes)--A taxilane providing a route through or across an apron
which is intended as a primary taxi route for access to other taxilanes, aprons, taxiways or the runway.
Taxiway--A specially prepared or designated path, on an airfield or heliport other than apron areas, on
which aircraft move under their own power to and from landing, service and parking areas.