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Aerodromes and low flyingQuestion 287 of 351

A structure is far from any aerodrome and any VFR route. At what height AGL does it become an obstacle to air navigation?

  1. Higher than 150 m.
  2. Higher than 120 m.
  3. Higher than 300 m.
  4. Higher than 90 m.
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Correct answer: Higher than 150 m.

Any building, structure or object higher than 150 m AGL is an obstacle to air navigation, wherever it is.

Source: Canadian Aviation Regulations (SOR/96-433), CAR 601.23 Obstacles to Air Navigation

Practice aerodromes and low flying

Questions last reviewed: 18 October 2026