Rwy

Rwy is an abbreviation commonly used in aviation to refer to a runway, the prepared surface at an airport used for aircraft takeoffs and landings. The term appears on charts, flight documents, and in air traffic control communications where space is limited. In many contexts, “Rwy” is followed by a runway designator (for example, Rwy 09) or by a full designation such as Rwy 09L/27R.

Runways are designated by a two-digit number derived from their magnetic azimuth, rounded to the nearest ten degrees. A runway can have one end or two opposing ends, each with its own designation. When multiple runways exist at an airport, they may be labeled with letters to distinguish parallel runways, such as 09L, 09C, and 09R. Runway length, width, and surface type (asphalt, concrete, or occasionally gravel or grass at smaller fields) vary and determine which aircraft can operate there.

Runway markings and lighting aid operation. Typical markings include threshold markings, runway numbers, a centerline, and aiming points. Lighting systems include runway edge lights, threshold lights, and approach lighting; some runways have PAPI or VASI visual slope indicators to assist descent. Displaced thresholds and declared distances may reduce available takeoff and landing lengths in certain conditions.

Rwy operations are governed by international and national standards set by organizations such as the International Civil Aviation Organization (ICAO) and national authorities like the U.S. Federal Aviation Administration (FAA). Operators follow procedures for takeoff and landing performance, braking action, wind, visibility, and air traffic control clearances.

See also Runway, Airport, Instrument landing system.