Practice question

When two aircraft on the same track are equipped with DME and one follows the other, what is the standard DME-based longitudinal separation minimum under ICAO Doc 4444?

  1. 5 NM
  2. 10 NM
  3. 20 NM (or 10 NM if the leading aircraft is maintaining a true airspeed 20 kt or faster than the following aircraft)
  4. 40 NM

Answer: C — 20 NM (or 10 NM if the leading aircraft is maintaining a true airspeed 20 kt or faster than the following aircraft)

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