The most common approach light system configurations include: ALSF-1: Approach Lighting System with Sequenced Flashing Lights configuration 1 ALSF-A2: Approach Lighting System with Sequenced Flashing Lights configuration 2 The most common approach light system configurations include: ALSF-1: Approach Lighting System with Sequenced Flashing Lights configuration 1 ALSF-2: Approach Lighting System with Sequenced Flashing Lights configuration 2Ħ Approach Lighting System Configuration 2 From there the pilot will either try the same approach again, try a different approach or divert to another airport.ĥ ALS Configurations ALS are designed to allow the pilot to quickly and positively identify visibility distances under Instrument Flight Rules (IFR). This is where the aircraft will climb back to a predetermined altitude and position. At this point, the pilot must have the runway or its approach lights in sight to continue the approach.Ĥ ALS uses If pilot can not see the ALS, the approach must be aborted and a missed approach procedure will be performed. While approach, pilot will follow the ILS and descend along the glideslope, until the Decision height based on ILS categories is reached. At the point where Decision Height is reached, pilot must be able to see ALS, then pilot can continue the approach. ALS allows the pilot to see and identify the Runway end and align the aircraft to land on the runway. ALS consist of a series of Light bars and Strobe lightsģ ALS uses ALS serve the runway that has the Instrument Approach Procedure such as Instrument Landing System (ILS). It is a lighting systems installed on the Approach end of an Airport. 2 Introduction Approach Lighting System (ALS) is the tail end of the Air Navigation System.
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