General

Where an object, regardless of its height, has been assessed as constituting an obstacle to air navigation, it requires marking and/or lighting.

The following objects must be marked and/or lighted in accordance with the Canadian Aviation Regulations

  • Any object penetrating an airport obstacle limitation surface (OLS)
  • Any object greater than 90 metres above ground level (AGL) within 6 km of the geographical centre of an aerodrome
  • Any permanent catenary wire crossing where any portion of the wires or supporting structures exceeds 90 metres AGL
  • Any object greater than 150 metres AGL
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