Plain English Meaning
A short code that means 'icing' — that is, ice forming on the aircraft as it flies through cold, moist air.
Full Definition
A weather phenomenon code used in aviation weather reports and forecasts to indicate the presence or forecast of aircraft icing conditions, where supercooled water droplets freeze on contact with an aircraft's airframe, propeller, or engine intakes.
Context Anchor
Seen in coded pilot weather reports during weather briefings, preflight planning, and in displays.