Approach Lighting System

An Approach Lighting System (ALS ), ( German approach lights ), at an airfield is a lighting system that is mounted in front of the threshold of a runway. It consists of a series of light stripes, and / or strobe lights.

Purpose

Pilots can recognize on sight restrictions and at night where the runway is and how the plane is designed by ALS. An AS is established at aerodromes where instrument approach procedures have either set up or the place for VFR night flight traffic is allowed.

Configuration

ICAO has certain configurations set as default. The most commonly used form is shown in the graphic. There are the following additional configurations are common:

• MALSF: medium -intensity approach light system with a flashing sequence.
• ALSF -1: Approach light system configuration 1
• ALSF -2: Approach light system configuration 2
• CALVERT I/ICAO-1: ICAO -compliant configuration 1
• CALVERT II/ICAO-2: ICAO -compliant configuration 2
• LDIN: Lead - in lighting
• MALSR: Medium -intensity approach light system with " Runway alignment indicator lights".
• Odals: Omnidirectional approach light system
• SALS: Short approach light system
• SSALF: Simplified short approach light system with a flashing sequence
• SSALR: Simplified short approach light system with " Runway alignment indicator lights"
• SSALS: Simplified short approach light system

Trivia

The Lead - in Lighting, ie in the direction of approach periodically flashes of strobe lights, is colloquially known because of their " movement " as a Running Rabbit.