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Approach Lighting with Sequenced Flashing Lights (ALSF) Category 2 (RLS_4)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: rls_4.ttl
- Name
alsfType2- Attribute
- RLS Aerodrome Approach Lighting System Type
- Definition
- A high-intensity approach lighting system including sequenced flashing lights in a Precision Approach ILS Category II configuration.
- Description
- The variable intensity approach lights extend a total of 720 metres (2400 feet), and possibly up to 900 metres (3000 feet) when permitted by the terrain, from the runway threshold. This approach lighting system may operate as a Short Simplified Approach Lighting (SSAL) System with Runway Alignment Indicator Lights (RAIL) when weather conditions permit by selectively disabling a subset of lights (for example: white main bars and/or red side row bars) in the pattern.
- Accepted
- 2013-10-18
- Allowed for
- GB485 Approach Lighting System
- RWOI terms naming it
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.