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ICAO recommendations & practical guide for beacon installations

 

The presence of obstacles (towers, buildings, chimneys, cranes, high voltage lines, etc.) are a major risk for aircraft flying at low altitude. The competent authorities have created rules to signal these obstacles in order to obtain a certain degree of safety. Any object that poses a danger to aircraft flying at low altitudes must be marked with beacons. The International Civilian Authority (ICAO) legislated in Chapter 6, the rules regarding the characteristics of the beacon lamps and the ways of their installation. Some of the main points of the regulation, some type of obstacle to be marked and the installation rules are given below.

 

Aviation obstruction light selection and installation key points

 

1.  The configuration of aviation obstruction lights should first consider the height of obstacles or buildings, and all the height of structure in meters is calculated from above of ground level.

2.  High-intensity obstruction lights are recommended on structures with a height of more than 150m.

3.  In the case of an object to be lighted, one or more low-, medium- or high-intensity obstruction lights should be located as close as possible to the top of the object. For chimney and other similar structures, the top light should be located at a sufficiently low position below the top to minimize contamination by smoke.

4.  For a large object or a group of dense objects that should be illuminated, aviation obstruction lights must be set up to indicate the basic outline of the object: the arrangement and quantity should be able to identify obstacles from each azimuth and should not be covered by any part of the obstructions.
 

Installation of beacon lamps on construction equipment

 
Crane height <45m
3 Aexio beacons of low intensity Type B (LS810), installed in the crane tip, arm tip and counter balance
Crane height> = 45m
3 Aexio beacons (low intensity Type B (LS810) installed in the crane tip, arm tip and counter balance 2 Aexio beacon lamps (low intensity Type B (LS810)) installed at half distance from the ground

 

Chimney aviation obstruction light configuration scheme

 

Due to the special structure of the chimneys, the aviation obstruction light's installation should be located 1.5-3m under the top of chimney. When the height of the chimney is more than 150 meters, the obstruction light can be located within 7.5 meters under the top of the chimney.

Standard: CAAC、ICAO、FAA 《MH/T6012-2015》《MH5001-2013》

 

H ≤ 45m

  • Top with one layer medium intensity aviation obstruction light, and 7 color marks brush should be painted.

45<H ≤ 105m

  • Chimney shall set multi-layer aviation obstruction lights, top install medium intensity type B aviation obstruction light and low intensity aviation obstruction lights at the other layers and the distance between each layer shall not be more than 45 meters and be as equal as possible.

105< H ≤ 150m

  • Chimney shall set multi-layer aviation obstruction lights, top install medium intensity type A aviation obstruction light and medium intensity aviation obstruction light at the other layers, the distance between each layer shall not be more than 45 meters and be as equal as possible.

H ≥ 150m

  • Multi-layer high intensity aviation obstruction lights should be installed, and distance between two layers should be 75-105m, between the high intensity obstruction lights should install the medium intensity lights.

A schematic diagram of the number of aviation obstruction lights on each layer:

 

Chimney each layer install aviation obstruction light quantity depends on outside diameter, refer to the following recommend quantity:

 

6m or less                           3 Light units /per level

 

6m to 30m                           4 Light units /per level

 

30 m to 60m                        6 Light units /per level

 

more than 60m                    8 Light units /per level

High-rise building aviation obstruction light configuration scheme

 

Aviation obstruction lights set in high-rise buildings and buildings should be able to show the outline of the object from all directions. The horizontal direction can also be referenced to set obstruction lights at a distance of about 45 meters. Generally, the obstruction lights should be installed at the top of the building, and the installation height H should be from the horizontal ground.

Standard: CAAC、ICAO、FAA 《MH/T6012-2015》《MH5001-2013》

 

H ≤45 meters

  • One dual low intensity aviation obstruction light or low intensity aviation obstruction light at top.

45< H < 105m

  • 2 levels obstruction lights will be needed, top with medium intensity obstruction light and middle level with low intensity obstruction light

105 ≤ H < 150m

  • Top with medium intensity obstruction type A light, 2nd level with medium intensity obstruction and 1 st Level with low intensity light.

H ≥ 150m

  • Top and 75- to 105-meter intervals install high intensity aviation obstruction lights, install medium intensity lights between high intensity aviation obstruction lights.
 

Tower aviation obstruction light configuration scheme

 

Towers, which are defined as tall structures, should be equipped with aviation obstruction lights to warn aircraft. All the obstruction lights allocation should be strictly in compliance with the regulations such as CAAC in China, and most common international regulations are ICAO’s and FAA’s. Installation recommendations according to tower height is shown below:

Standard: CAAC、ICAO、FAA 《MH/T6012-2015》《MH5001-2013》

 

H ≤ 30m                Top with 1 low intensity obstruction light

 

30m < H ≤ 45m     Top with 1 dual low intensity aviation obstruction light

 

45m < H ≤ 90m     Top with 1 medium intensity aviation obstruction light, 1/2 level install 1 low intensity aviation obstruction                                     lights

 

90m < H ≤ 150m    Top with 1 medium intensity type A aviation obstruction light, 2/3 level and 1/3 level install low intensity                                       aviation obstruction lights or medium intensity aviation obstruction lights

 

H ≥ 150m                Top and at intervals of 75-105 meters install high intensity aviation obstruction lights, install medium                                            intensity lights between high intensity aviation obstruction lights

 

Remark: Medium intensity obstruction light type A for day use and medium intensity obstruction light type C for night use only.

 

 

Aviation obstruction light selection and installation points

 

1.  For wind turbines less than 150m in overall height(hub height plus vertical blade height)need install medium intensity aviation obstruction lights.


2.  For wind turbines from 150m to 315m in overall height, a second light serving as an alternate should be provided in case of failure of the operating light.

 

3.  In addition, for wind turbines from 150m to 315m in overall height, an intermediate level at half the nacelle height of at least three low-intensity type E lights should be provided. If an aeronautical study shows that low-intensity type E lights are not suitable, low-intensity Type A or B lights may be used.


4. When blade rotation might block the aviation obstruction light, installation of 2 units on two sides with a distance greater than the width of the blade is required.

baliza turbina eoliana

 Wind turbines aviation obstruction light configuration scheme