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Approach Lighting with Sequenced Flashing Lights (ALSF) Category 1 (RLS_1)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

RDF: rls_1.ttl

Name

alsfType1

Attribute

RLS Aerodrome Approach Lighting System Type

Definition

A high-intensity approach lighting system including sequenced flashing lights in a Precision Approach ILS Category I 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.

Accepted

2013-10-18

Allowed for

• GB485 Approach Lighting System

RWOI terms naming it

• RWO_00151 ALSF Category 1
• RWO_00153 ALSF-I
• RWO_00226 Approach Lighting with Sequenced Flashing Lights (ALSF) Category 1

Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.