prime navaids facilities

prime navaids facilities

[′prīm ′na‚vādz fə‚sil·əd·ēz]
(navigation)
Navigational aid facilities that, under certain operational environments (for example, weather or mission) are considered to be essential to the safe completion of departure and approach-to-land maneuvering by aircraft; these facilities may include RAPCON, GCA, ILS, TACAN, VOR, and associated critical air-traffic control communications equipments.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.