terrain alert

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 terrain elevation in relation to aircraft current altitude. Green indicates terrain 1000 to 1500 ft below the current altitude. Yellow indicates that the terrain ahead is 500 to 1000 ft above the current altitude. If the color is red, the terrain is at 500 ft or at a lower altitude. Terrain alert is indicated by a red triangle with a “T” inside.
ii. A terrain or an obstruction alert is issued when, in the controller’s judgment, an aircraft’s altitude places it in an unsafe proximity to the terrain and/or obstructions.

Aviation dictionary. 2014.

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