The ApproachLightingSystem class is a specialization of the GroundLightSystem abstract feature. Its structure is shown in the figure below.

The specialization adds the following attributes:

classICAO specifies a classification of the approach lighting system according to ICAO Annex 14 SARPs (i.e. 'SIMPLE', 'CAT1', 'LEADIN', etc.).
type contains a regional or organization specific classification of the system.
length specifies the overall length of the approach lighting system.
sequencedFlashing indicates whether sequenced flashing is available.
alignmentIndicator indicates whether an alignment indicator is available.

In addition an association to a RunwayDirection feature is added. This association also makes the general properties of the airport where the light system is situated available. From the ApproachLightingSystem feature the corresponding AirportHeiport feature is navigable via the RunwayDirection and Runway features.

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