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Aviation occurrencesQuestion 276 of 351

In the Regulations, what does a risk of collision mean?

  1. An aircraft comes so close to a collision that a threat to safety exists
  2. An aircraft passes another at a distance of one mile
  3. Two aircraft use the same radio frequency
  4. An aircraft flies in controlled airspace
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Correct answer: An aircraft comes so close to a collision that a threat to safety exists

A risk of collision is a situation where an aircraft almost collides and a threat exists to people, property or the environment.

Source: Transportation Safety Board Regulations (SOR/2014-37), Section 2(6) Definitions — risk of collision

Practice aviation occurrences

Questions last reviewed: 18 October 2026