Practice question

Under what conditions is the Distress Phase (DETRESFA) immediately declared by an air traffic services unit under ICAO Annex 11 / Annex 12?

  1. When an aircraft requests a change of transponder squawk code
  2. When an aircraft switches frequencies from Bahrain Approach to Bahrain Tower
  3. When positive information is received that an aircraft is in grave and imminent danger, or when fuel on board is considered exhausted, or following unsuccessful ALERFA inquiries
  4. When the airport surface wind changes direction by 10 degrees

Answer: C — When positive information is received that an aircraft is in grave and imminent danger, or when fuel on board is considered exhausted, or following unsuccessful ALERFA inquiries

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