Practice question

Under ICAO Annex 11, when MUST an ATS unit immediately declare the DETRESFA (Distress Phase) of Search and Rescue alerting?

  1. When an aircraft fails to report position within 5 minutes of estimates
  2. When there is reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger, or when fuel on board is calculated to be exhausted
  3. Whenever a VFR flight plan is submitted without a designated alternate aerodrome
  4. When an aircraft enters Class G airspace without transponder operational

Answer: B — When there is reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger, or when fuel on board is calculated to be exhausted

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: SLCAA ATC Knowledge Test Practice Questions - Sierra Leone Civil Aviation Authority Air Traffic Controller Knowledge Test Exam →