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Aerodromes and low flyingQuestion 288 of 351

A pipeline marks a recognized VFR route. A mast is higher than 90 m AGL. At what distance from the centreline is it an obstacle to air navigation?

  1. Within 1.5 km of the centreline.
  2. Within 6.0 km of the centreline.
  3. Within 3.7 km of the centreline.
  4. Within 9.0 km of the centreline.
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Correct answer: Within 3.7 km of the centreline.

A structure higher than 90 m AGL within 3.7 km of the centreline of a recognized VFR route is an obstacle.

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