primary surface

A rectangular surface longitudinally centered about a runway. Its width is a variable dimension, and it usually extends 200 ft (60 m) beyond each end of the runway when the runway has a specially prepared hard surface. When the runway has no specially prepared or planned hard surface, the primary surface ends at each end of that runway. The elevation of any point on this surface coincides with the elevation of the nearest point on the runway centerline or the extended runway centerline.

Aviation dictionary. 2014.

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  • Primary Surface — I Primary Surface   [dt. »primäre Oberfläche«] die, Teil der Bilddaten in einem Bildschirmspeicher, der zum sichtbaren Bildbereich gehört (im Unterschied zu den nicht sichtbaren, den Offscreen Surfaces, dt. »Oberflächen außerhalb des… …   Universal-Lexikon

  • Surface plate — A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. The surface plate is often used as the baseline for all measurements to the workpiece, therefore …   Wikipedia

  • Primary form — is used in surface metrology to refer to the over all shape of a surface which can be measured quantitatively, as contrasted with more local or higher spatial frequency variations in the surface dimensions such as surface waviness or surface… …   Wikipedia

  • Surface Marker Buoy — (standard) = A Surface Marker Buoy, SMB or simply a blob is an inflatable buoy used by SCUBA divers, with a line, to mark the diver s position to their surface, safety boat while the diver is underwater.SMBs are inflated on the surface before… …   Wikipedia

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  • Surface enhanced Raman spectroscopy — Surface Enhanced Raman Spectroscopy, or Surface Enhanced Raman Scattering, often abbreviated SERS, is a surface sensitive technique that results in the enhancement of Raman scattering by molecules adsorbed on rough metal surfaces. The enhancement …   Wikipedia

  • Surface metrology — is the measuring of small scale features on surfaces, and is a branch of Metrology. Surface primary form, surface waviness and surface roughness are the parameters most commonly associated with the field. It is important to many disciplines and… …   Wikipedia

  • Surface exposure dating — is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth s surface. Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows,… …   Wikipedia

  • Primary succession — is one of two types of ecological succession and biological succession of plant life, and occurs in an environment in which new substrate, devoid of vegetation and usually lacking soil, is deposited (for example a lava flow). (The other type of… …   Wikipedia

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