Practice question

What four strict meteorological conditions must be met simultaneously for an aerodrome weather report to state 'CAVOK' (Ceiling and Visibility OK)?

  1. 1. Visibility >= 10 km, 2. No clouds below 5,000 ft or below minimum sector altitude (whichever is higher), 3. No cumulonimbus (CB) or towering cumulus (TCU) at any altitude, and 4. No significant weather phenomena (no rain, fog, storms, etc.).
  2. Visibility >= 5 km and temperature above 20°C.
  3. Zero wind and no clouds at any altitude.
  4. When the airport is closed for maintenance.

Answer: A — 1. Visibility >= 10 km, 2. No clouds below 5,000 ft or below minimum sector altitude (whichever is higher), 3. No cumulonimbus (CB) or towering cumulus (TCU) at any altitude, and 4. No significant weather phenomena (no rain, fog, storms, etc.).

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