Aviation Obstruction Light Selection and Installation Plan

Aviation obstruction lights for large bridges

Aviation Obstruction Light Selection and Installation Plan

I. Relevant Civil Aviation Regulations

National civil aviation standards have detailed requirements for the installation of obstruction lights. Key points are summarized below:

  1. Top Installation
    One or more obstruction lights must be installed at the top of a structure. For chimneys or similar structures, the top light(s) must be positioned 1.5 to 3 meters below the highest point.
  2. Mid-Level Installation
    If the height of the structure exceeds 45 meters above ground level, obstruction lights must also be installed at intermediate levels.
    • The spacing between these intermediate obstruction lights should be as equal as possible from the top light to the ground.
    • For low- and medium-intensity obstruction lights, the vertical spacing should not exceed 45 meters.
    Recommended Number of Light Layers:
    N = H / 45
    (where H = object height in meters, 45m = recommended spacing)
  3. Widespread Structures
    For structures with a large horizontal surface area, obstruction lights should outline the object’s contour, and horizontally spaced lights should be installed at approximately 45-meter intervals for full visibility from all directions.
  4. Structures Over 150 Meters
    For ultra-high structures (above 150 meters), high-intensity obstruction lights must be installed at the top. A combination of medium- and high-intensity lights should be used to highlight the structure’s presence.

II. Obstruction Light Selection by Intensity (H = Height of the Structure)

  • 45m < H ≤ 60m: Use low-intensity GZ-6 aviation obstruction lights.
  • 60m < H ≤ 105m: Use a combination of medium-intensity models GZ-75 or GZ-155.
  • 105m < H ≤ 150m: Use high-brightness medium-intensity GZ-75 and high-intensity GZ-155 lights in combination.
  • H > 150m: Use a combination of medium- and high-intensity lights, such as GZ-155 or GZ-90.

All light fixtures should be selected from the GZ series long-lifespan obstruction lights manufactured by Shanghai Xinhangyuan Company.

III. Effective Intensity by Light Type

  1. Low-Intensity Obstruction Lights:
    Effective intensity: 150 cd
    Light mode: Red flash or steady red
  2. Medium-Intensity Obstruction Lights:
    Effective intensity: 1600 cd
    Light mode: Generally red flashing
  3. High-Intensity Obstruction Lights:
    Effective intensity: 4000 cd
    Light mode: Generally white flashing
    (When background intensity is less than 50 cd)

IV. Lightning Protection Measures

  1. Top-Mounted Lights:
    Aviation obstruction lights installed at the top must include lightning arresters, which should be tightly connected to lightning rods or similar protective structures.
  2. Mid-Level Mounted Lights:
    Lights installed in the middle of the building should be enclosed with a metal mesh cover for protection and must be properly grounded, along with the metal components of the light fixture.

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