Airport Lighting, Markings & Signs
Card 1 of 40
00
Term
Approach Light Systems (ALS)
Definition
• Provide transition from instrument to visual flight • Precision runways: 2,400-3,000 feet • Nonprecision runways: 1,400-1,500 feet • May include sequenced flashing lights ('ball of light' effect) • Various configurations: ALSF-1, ALSF-2, SSALR, MALSR, etc.
AIM 2-1-1