noun
aircraft warning light; obstruction light
Technical term for lights on tall structures such as buildings, chimneys, and towers to warn aircraft. Used in aviation safety contexts.
高層ビルの屋上には航空障害灯が設置されている。
Aircraft warning lights are installed on the rooftop of the skyscraper.
夜間、航空障害灯が赤く点滅する。
At night, the obstruction light flashes red.
航空灯台 is an aeronautical beacon used for navigation, while 航空障害灯 specifically warns of obstacles.
Compound of 航空 (aviation), 障害 (obstacle), and 灯 (light). A straightforward modern technical term.