![]() The white steady burning lights of the ALSF II are greatly reduced to conserve power under improved visibility and the side row barrettes are not powered. SSALR (Simplified Short Approach Lighting System with Runway Alignment Indicator Lights) mode is used during instrument landing approach to align the aircraft with the centerline of the runway. Three intensity settings allow the approach to be used under changing weather conditions. Up to twenty-one white lights create a sequential strobing flash pattern that rolls toward the runway threshold. Up to 174 steady burning white lights serve as a reference plane, and two rows of red side row barrettes increase the pilots horizontal perception. The Dual Mode ALSF II/SSALR approach lighting system allows Category II runways to operate in either the full ALSF II mode or in the economical SSALR mode, depending on weather conditions.ĪLSF II (Approach Lighting System with Sequenced Flashing Lights) mode is used on Category II runways during instrument landing approach to align the aircraft with the centerline of the runway and to establish vertical orientation. Several different configurations are available:ĪLSF I (Approach Lighting System with Sequenced Flashing Lights) is used on Category I runways during instrument landing approach to align the aircraft with the centerline of the runway and to establish vertical orientation. Approach lighting systems provide landing approach guidance for pilots.
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