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Aviation occurrencesQuestion 347 of 351

What is a loss of separation?

  1. Two aircraft fly on the same track at once.
  2. An aircraft leaves the altitude that ATC assigned.
  3. An aircraft enters a different class of airspace.
  4. Two aircraft are closer than the ATC minimum.
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Correct answer: Two aircraft are closer than the ATC minimum.

A loss of separation is when two aircraft are closer than the minimum in the Canadian Domestic Air Traffic Control Separation Standards.

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

Practice aviation occurrences

Questions last reviewed: 18 October 2026