Anglais ⇄ Anglais Français Langues chinoises Russe

required visual reference contraintes
techn.	необходимый визуальный контакт (с наземными ориентирами в полете)
Anglais glossaire
required visual reference
aviat., canad.	In respect of an aircraft on an approach to a runway, the section of the approach area of the runway or the visual aids that, when viewed by the pilot of the aircraft, enable the pilot to make an assessment of the aircraft position and the rate of change of position relative to the nominal flight path in order to continue the approach and complete the landing