| 释义 |
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. |