In contrast, the non-precision instruments runway has approach lighting spaces that cover an area of 1,400 feet to 1,500 feet. The size of the approach light on the runway extends from 2,400 feet to 3000 feet into the approach area for precision on instrument runways. The purpose of the approach to light the runway is to indicate the actual direction of the runway and allow the pilots to visualize the touchdown zone from farther distances. Unlike other runway lightings, the approach lighting system is positioned at the approach area on the runway and stops at the threshold. The approach lights at the runway are the first lights that the pilot will reach during the landing process. There are generally nine types of lighting systems practiced in the aviation industry, from the touchdown lighting that indicates the touch zone for the incoming aircraft to the PAPI lighting system that helps the pilot to keep track with the correct course. Basically, the runway centerline lights are placed between the distances of 50 feet apart from each other and are required for all CAT II and CAT III runways and even for some of the CAT I runways depending on the operating hours and size of the aircraft. And, the centerline lighting at the final 1,000 feet of runway is indicated by all red centerline lighting systems. The centerline lighting system on the runway is generally in white color near the approaching end of the runway and transits to alternating white and red lights in its length at 3,000 feet from the end of the runway, the centerline lights in the runway remain white. The runway’s centerline lights indicate the middle position of the runways, whereas the edge lighting, which compromises white lights on both edges of the runway, indicates the runway edges so the pilot can navigate properly without any mishap. It is a component of the airport lighting system, guide the airplanes through runways and taxiways at night or adverse weather conditions where the navigation becomes necessary without clear visuals on the runway.
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