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Refer to figure.
What is the approach lighting system of Runway 21 at Netherlands De Kooy airport?

  • A

    Precision with barrette type.

  • B

    Precision with single light system.

  • C

    Simple with barrette type.

  • D

    Simple approach light system with individual lights on the extended centre line.

Refer to figures.
From the aerodrome chart we can see that the airport uses a HIALS (High Intensity Approach Lighting System) for both runways and HIRL (High Intensity Runway Lights). The Approach Lighting System of Runway 21 extends up to 870 m. According to ICAO Annex 14 this is the length required for a CAT I approach lighting system. (CAT I approach lighting system usually extends up to 900 m.)

On the aerodrome graph the approach lighting system of Runway 21 (upper runway side) shows barrettes on the extended centre line and five crossbars, which is the configuration of a CAT I approach lighting system (refer to figure 2).

Note1: On the graph the 'dot' lights (.) refer to single source of light and the 'dash' lights (_) refer to a barrette.

Note2: The answer will be different for Runway 03.


ICAO Annex 14
Precision approach category I lighting system

5.3.4.10 A precision approach category I lighting system shall consist of a row of lights on the extended centre line of the runway extending, wherever possible, over a distance of 900 m from the runway threshold with a row of lights forming a crossbar 30 m in length at a distance of 300 m from the runway threshold.

Characteristics
5.3.4.14 The centre line and crossbar lights of a precision approach category I lighting system shall be fixed lights showing variable white. Each centre line light position shall consist of either:

a) a single light source in the innermost 300 m of the centre line, two light sources in the central 300 m of the centre line and three light sources in the outer 300 m of the centre line to provide distance information; or

b) a barrette.

Barrette. Three or more aeronautical ground lights closely spaced in a transverse line so that from a distance they appear as a short bar of light.

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