Practice question

What is the standard ICAO broadcast phraseology used by an air traffic controller to alert traffic when an aircraft initiates an emergency descent through a busy airspace sector?

  1. 'ATTENTION ALL STATIONS, EXPEDITE LANDING AT NEAREST RUNWAY'
  2. 'ALL AIRCRAFT DESCEND TO SEA LEVEL IMMEDIATELY'
  3. 'MAYDAY CONTROLLER, CLEAR ALL RUNWAYS FOR MILITARY TRAFFIC'
  4. 'ATTENTION ALL AIRCRAFT IN [FIR/Sector], EMERGENCY DESCENT IN PROGRESS FROM [Level] TO [Level], ALL AIRCRAFT FLY [Heading/Level]...'

Answer: D — 'ATTENTION ALL AIRCRAFT IN [FIR/Sector], EMERGENCY DESCENT IN PROGRESS FROM [Level] TO [Level], ALL AIRCRAFT FLY [Heading/Level]...'

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