Aviation obstruction lights installation location | medium-intensity obstruction lights high-intensity obstruction lights low-intensity installation settings
Suggestions on how to combine low-, medium-, and/or high-intensity obstruction lights to indicate obstacles.
One or more low-, medium-, or high-intensity obstruction lights must be placed as close to the top of the object as practicable.
The obstruction lights at the top must be arranged to at least show the highest point or the highest edge of the object relative to the obstacle restriction surface.
However, in actual use, due to the consideration of lightning protection, it is generally retracted by about 1 to 3 meters according to the height. Recommendations-For chimneys or other structures of similar nature, the top lights should be placed at a sufficiently low position below the top to minimize the pollution caused by smoke, etc. Generally 3 to 5 meters lower
For a tower or antenna structure with attachments such as antennas or rods with a length of more than 12 m to be marked by high-intensity obstruction lights during the day, if it is not practical to install high-intensity obstruction lights on the top of the attachment, it must be Install the high-intensity obstruction light at the highest point possible, and if practicable, install an A-type medium-intensity obstruction light on the top of the appendage.
For a large object or a group of dense objects, the top light must at least show the highest point or the highest edge relative to the obstacle limit surface to mark the basic outline and range of the object. If there are two or more edges of the same height, the edge closest to the landing area must be marked. Where low-intensity obstruction lights are used, their longitudinal spacing must not be greater than 45 m. Where medium intensity obstruction lights are used, their longitudinal spacing must not be greater than 90m.
Recommendation-When the obstacle restriction surface involved is an inclined plane, and the highest point of the object protruding above the obstacle restriction surface is not the highest point of the object itself, an obstacle light should be added to the highest point of the object.
When the top of the obstacle marked by the A-type medium-intensity obstacle light is higher than the surrounding ground or the top elevation of nearby buildings (when the obstacle is surrounded by multiple buildings) by more than 105 m, an obstacle light must be added in the middle. The additional mid-level obstruction lights must be installed as far as possible at an equal distance of no more than 105 m between the top obstruction lights and the ground or the top elevation of nearby buildings, depending on the situation.
When the top of the obstacle marked by the B-type medium intensity obstacle light is higher than the surrounding ground or the top elevation of nearby buildings (when the obstacle is surrounded by multiple buildings) by more than 45 m, an obstacle light must be added in the middle. The additional intermediate layer obstruction lights must be alternate B-type low-intensity obstruction lights and B-type medium-intensity obstruction lights, and as appropriate, the distance between the top obstruction lights and the ground or the top elevation of nearby buildings should be no more than 52 m. Equidistant settings.
When the top of the obstacle marked by the C-type medium-intensity obstacle light is higher than the top elevation of the surrounding ground or nearby buildings (when the obstacle is surrounded by multiple buildings) by more than 45 m, an obstacle light must be added in the middle. The additional mid-level obstruction lights must be installed as far as possible at an equal distance of no more than 52 m between the top obstruction lights and the ground or the top elevation of nearby buildings as appropriate.
Where A-type high-intensity obstruction lights are used, the obstruction lights must be evenly arranged between the ground and the top obstruction lights according to relevant regulations at an interval of no more than 105 m, but nearby buildings can be used when the object is surrounded by multiple buildings. The top elevation of the object replaces the ground to determine the number of layers of obstruction lights.
Where B-type high-intensity obstruction lights are used, the obstruction lights must be installed at the following three levels:
——The top of the tower;
——The lowest point of the suspension line of a wire or cable;
——The approximate middle height between the above two floors.
Note—In some cases, this may require lights to be located outside the tower.