For non-precision approaches, the ALS extends from the threshold to what distance?

• A. 2,400-3,000 ft
• B. 4,000-4,500 ft
• C. 1,400-1,500 ft
• D. 3,000-3,500 ft

Answer: (C)

Non-precision approaches rely on visual cues rather than a published glideslope, so the approach lighting system is designed to provide reliable lighting from the threshold out to a moderate distance. For these approaches, the standard ALS extends from the threshold to about 1,400 to 1,500 feet. This distance gives pilots enough runway environment cues to align and descend safely without the extra lighting length required by precision approaches, which use longer ALS extensions (around 2,400 feet or more). The other listed distances are longer than standard for non-precision and would typically align with precision approach lighting configurations.