AVIATION OBSTRUCTION LIGHTS ON TOWERS

Telecommunication and Transmission Towers Applications

Telecommunications  &  Radio  Towers  are,   typically,  tall structures designed to support antennas for telecommunications and broadcasting, including television. They are among the tallest man-made structures.

An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists of one or more conductors (commonly multiples of three) suspended by towers or poles.

BASIC RULES

  • The number of light levels recommended depends on the height of the structure;
  • The number and arrangement of light units at each level should be placed so the lighting is visible from every angle in azimuth;
  • Lights are applied to display the general definition of the structure;
  • Width and length of buildings determine the number of lights installed at the top and at each light level.
Aviation obstruction system telecommunication tower

LIGHTS SPECIFICATIONS

  • Low intensity lights should be used for structure with H ≤ 45 m during night time, if those are considered inadequate, than medium – high intensity lights should be used.
  • Medium intensity lights type A,B or C should be used to lit extensive object (group of buildings or tree) or structure with 45 m < H ≤ 150 m.
  • Note: Medium intensity lights, type A and C should be used alone, whereas medium intensity lights, Type B should be used either alone or in combination with LIOL-B.
  • High intensity type A, should be used to indicate the presence of an object if its H > 150 m and an aeronautical study indicates such lights to be essential for the recognition of the object by day.

AVIATION OBSTRUCTION LIGHT MARKINGS

There is 3 option for lighting a tower with aviation obstruction light systems.

  1. If the tower is to be lighted only at night with red light
    • If the authorities state that there is no need to light the day
    • If the tower marked with paint (white-red strip)
  2. If the tower is to be lighted day and night with white light
  3. If the tower is to be lighted with white light at daytime and with red light at night time
    • If the authorities state that white light is too much discomfortable at night

1 – IF THE TOWER IS TO BE LIGHTED ONLY AT NIGHT

HEIGHT N° OF LEVELS
H ≤ 45m Only one level: Low intensity
 

45m < H ≤ 105m

2 levels:

Top level: Medium intensity – B Type;

Intermediate level: Low / Medium intensity – B Type.

 

 

105m < H ≤ 210m

4 levels:

Top level: Medium intensity – B Type;

First Intermediate level: Low / Medium intensity – B Type;

Second Intermediate level: Medium intensity – B Type;

Lower Intermediate level: Low / Medium intensity – B Type.

 

configuration aviation obstruction light 2

 

Lights should define the general shape of the object;

1 or more lights should be mounted outside at diagonally opposite positions;

 

configuration aviation obstruction light 4

Square base W<45m:

4 AWL;

Lights to be installed in each corner.

Number of Levels According to Height

telecom red aviation obstruction light

N° of lights depends on the diameter

chimney aviation obstruction light diameters

2 – IF THE TOWER IS TO BE LIGHTED DAY AND NIGHT WITH WHITE LIGHTS

Number of Levels According to Height

telecom white aviation obstruction light
HEIGHT N° OF LEVELS
H ≤ 105m Only one level: Medium intensity – A Type
 

105m < H ≤ 210m

2 levels:

Top level: Medium intensity – A Type;

Intermediate level: Medium intensity – A Type.

 

210m < H ≤ 315m

3 levels:

Top level: Medium intensity – A Type;

Intermediate level: Medium intensity – A Type;

Lower Intermediate level: Medium intensity – A Type.

3 – IF THE TOWER IS TO BE LIGHTED WITH WHITE AND RED LIGHTS

HEIGHT N° OF LEVELS
 

H ≤ 105m

2 levels:

Top level: Medium intensity – AB Type;

Intermediate level: Low / Medium intensity – B type.

 

 

 

105m < H ≤ 210m

4 levels:

Top level: Medium intensity – AB Type;

First Intermediate level: Low / Medium intensity – B Type;

Second Intermediate level: Medium intensity – AB Type;

Lower Intermediate level: Low / Medium intensity – B Type;

Number of Levels According to Height

telecom white red aviation obstruction light