Definition of the term 'terrain clearance system ' per official documentation of the United States Department of Defense.
terrain clearance system
(*) A system which provides the pilot, or autopilot, of an aircraft with climb or dive signals such that the aircraft will maintain a selected height over flat ground and clear the peaks of undulating ground within the selected height in a vertical plane through the flight vector. This system differs from terrain following in that the aircraft need not descend into a valley to follow the ground contour. (US DoD)
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