CRANES

AVIATION OBSTRUCTION LIGHTS ON CRANES

A crane is a type of tall machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves that can be used both to lift and lower materials and to move them horizontally.

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 Tower-Crane

LIGHTS SPECIFICATIONS

  • Low intensity aviation obstruction 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 aviation obstruction 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 aviation obstruction 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 crane with aviation obstruction light systems.

  1. If the crane 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 crane marked with paint (white-red strip)
  2. If the crane is to be lighted day and night with white light
  3. If the crane 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 CRANE 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 crane

 

1-3 AWL should be placed at top level and if required at jib and counter-jib

Number of Levels According to Height

crane red aviation obstruction light

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

Number of Levels According to Height

crane 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 CRANE 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

crane white red aviation obstruction light