🌫️✈️ Low visibility in aviation Low visibility occurs when Runway Visual Range (RVR) or forward visibility is reduced due to fog, rain, snow, haze, or clouds. In these conditions, pilots do NOT rely on outside vision. Instead, they fly using: ✔️ Flight instruments ✔️ ILS (Instrument Landing System) ✔️ Autopilot (when authorized) ✔️ Certified runway lighting systems Approaches are categorized as: 🔹 CAT I – decision height ≥ 200 ft 🔹 CAT II – decision height ≥ 100 ft 🔹 CAT III – allows landing