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Obstruction light warning


Balisage d'obstacle The expansion of the aerial navigation, and the consequent increase of airports/aerodromes make more and more necessary the use of suitable warning devices and obstruction lights on transmission lines.

To satisfy these requirements, DERVAUX proposes a range of products designed for obstruction lighting : 10Cd / 32Cd warning lights, emergency light, back up source systems, and solar generators.

These products have been designed in accordance with international standards and international air traffic rules.

International standards – rules:

Standards and air traffic rules are established by the International Civil Aviation Organization (ICAO).

These rules are generally worldwide applied by the National Civil Aviation of each country. But some countries use their own regulations (for example : the United States with Federal Aviation Administration (FAA) standards.

The aircraft warning recommendations for the overhead transmission lines are defined in two main standards:

  • ICAO regulation - Annex 14 Airports Volume 1 Design and technical use of airports,
  • FAA chapter 5 – « Red Obstruction light system ».

These standards state the different patterns, colours, luminous intensity as well as placement of warning lights.


Location of obstruction lights on: (Extracts from annex 14 ICAO)
  • Buildings:

    a. Dimension < 45m:
    Light unit at each end only (see picture 1: ex. C, D et E).

    b. Dimension = 45m:
    Light unit at each end +median unit lights (see picture 1: ex. A et B).

  • Chimneys, towers, aerials, poles, …:

    Light units should be placed to ensure that the light is visible 360° around the obstruction. If it is not possible with a single light unit, additional lights should be displayed every 120° around the obstruction.

    a. Height < 45 m:
    Unit light at each end (see picture Nr 2).

    b. Height = 45 m:
    Unit light at each end + median unit lights (see picture Nr 3) with:

    • Number of lights in height:
      N = Y(m) / 45
    • pacing of lights in height:
      X = Y / N = 45 m.
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