Aerodromes and low flyingQuestion 286 of 351

A tower stands 5 km from the centre of an aerodrome. It is higher than what height AGL to be an obstacle to air navigation?

  1. 90 m.
  2. 30 m.
  3. 60 m.
  4. 150 m.
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Correct answer: 90 m.

A structure higher than 90 m AGL within 6 km of the geographical centre of an aerodrome is an obstacle to air navigation.

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