The first lighting used on an airport was during the latter part of the 1920s; in the 1930s approach lighting came into use. These indicated the proper direction and angle of descent. The colours and flash intervals of these lights became standardized under the International Civil Aviation Organization (ICAO). In the 1940s, the slope-line approach system was introduced. This consisted of two rows of lights that formed a funnel indicating an aircraft's position on the glideslope. Additional lights indicated incorrect altitude and direction. COUNT 5
QSN1 When was the first lighting used on an airport? ANS1 latter part of the 1920s QSN2 When did approach lighting come into use? ANS2 1930s QSN3 When was the slope-line approach system introduced? ANS3 1940s QSN4 What indicated the proper direction and angle of descent? ANS4 approach lighting QSN5 What consisted of two rows of lights that formed a funnel, indicating an aircraft's position on the glidescope? ANS5 slope-line approach system