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AIM

10/12/17

2−2−2

Air Navigation and Obstruction Lighting

wire span. The lights are beamed towards the

companion structure and identify the area of the wire

span.

d. High intensity flashing white lights are also

employed to identify tall structures, such as chimneys

and towers, as obstructions to air navigation. The

lights provide a 360 degree coverage about the

structure at 40 flashes per minute and consist of from

one to seven levels of lights depending upon the

height of the structure. Where more than one level is

used the vertical banks flash simultaneously.