(*) 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 aircraft to avoid the obstruction.
TERRAIN AVOIDANCE SYSTEM
Meaning of TERRAIN AVOIDANCE SYSTEM in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012