Angielski ⇄ Angielski Rosyjski Ukraiński +

significant obstacle
lotn.	суттєва перешкода
Angielski tezaurus
significant obstacle
lotn.	Any natural terrain feature or man-made fixed object, permanent or temporary, which has vertical significance in relation to adjacent and surrounding features and which is considered a potential hazard to the safe passage of aircraft in the type of operation for which the individual chart series is designed.