Practice question

Under non-radar procedural control (ICAO Doc 4444), what is the standard time-based longitudinal separation minimum between aircraft on the same track at the same level?

  1. 15 minutes (or 10 minutes if navigation aids permit frequent position updating).
  2. 2 minutes.
  3. 30 seconds.
  4. 45 minutes.

Answer: A — 15 minutes (or 10 minutes if navigation aids permit frequent position updating).

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