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.
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.
References in periodicals archive ?
In aviation mode, pilots have the benefit of terrain and obstacle alerting, pop-up alerts, and customizable minimum clearance limits that give audible terrain alerts at specified altitudes.
The 5-passenger high-performance aircraft has the latest in safety and avionics features, including Garmin glass cockpit, traffic and terrain alerts, weather uplink, extended range tanks and cargo pod for additional baggage capacity.