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above terrain

См. также в других словарях:

  • above obstruction level — The height of an aircraft above terrain, structures, and obstacles in the area of operation. The height is nominated for aircraft carrying out very low flying. Pilots either take into consideration heights indicated on maps and charts when… …   Aviation dictionary

  • above ground level — The height of an aircraft above ground level. Also known as absolute altitude. It is measured by a radio, radar, or laser altimeter. When an aircraft is required to fly at a certain height above ground level, the AGL refers to its average height… …   Aviation dictionary

  • Terrain-following radar — (TFR) is an aerospace technology that allows a very low flying aircraft to automatically maintain a relatively constant altitude. It is sometimes referred to as ground hugging or terrain hugging flight. The term nape of the earth flight may also… …   Wikipedia

  • Above ground level — In aviation and atmospheric sciences, an altitude is said to be above ground level (AGL) when it is measured with respect to the underlying ground surface. This is as opposed to above mean sea level (AMSL), or in broadcast engineering, height… …   Wikipedia

  • terrain alert — i. A facility that alerts the pilot when the aircraft reaches a preset altitude above the terrain during descent. This facility is in the form of an audio and/or visual warning. This terrain alert system is a multicolored display. It shows… …   Aviation dictionary

  • terrain-awareness warning system — A system using an electronic map that provides a warning of higher terrain in the vicinity of the aircraft. The TAWS is a computer based system providing the flight crew with visual and acoustic alerts about the unintended approach to the terrain …   Aviation dictionary

  • Above mean sea level — The term above mean sea level (AMSL) refers to the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level datum. AMSL is used extensively in radio (both in broadcasting and other telecommunications… …   Wikipedia

  • terrain-avoidance radar — A special radar that permits aircraft to be flown safely at a preset clearance level. A normal PPI (plan position indicator) radar enables the terrain to be avoided in azimuth rather than in elevation. A specialist terrain avoidance radar, on the …   Aviation dictionary

  • terrain-clearance radar — A specialist radar system that helps in flying from peak to peak rather than accurately following the terrain contours. Aircraft maintains a pre set height and is warned of obstructions, which are at a pre set slant range away. The instructions… …   Aviation dictionary

  • terrain avoidance system — A system which provides the pilot or navigator of an aircraft with a situation display of the ground or obstacles which project above either a horizontal plane through the aircraft or a plane parallel to it, so that the pilot can maneuver the… …   Military dictionary

  • terrain following system — A system which provides the pilot or autopilot of an aircraft with climb or dive signals such that the aircraft will maintain as closely as possible a selected height above a ground contour in a vertical plane through the flight vector …   Military dictionary

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