Definition
Ice that forms on the external structure of an aircraft — wings, tail, fuselage, propeller, antennas, windscreen, and other exposed surfaces — when the aircraft flies through visible moisture (clouds, rain, drizzle) at temperatures at or below freezing. Airframe ice adds weight, disrupts the airflow over lifting surfaces, increases drag, reduces lift, and can block control surfaces or sensors.
Plain English
Ice that builds up on the outside of the airplane while flying through cold, wet air. It makes the aircraft heavier, less aerodynamic, and harder to control.
Context Anchor
You will encounter this term in cold-weather flying, preflight inspections, and performance discussions, especially when considering how added weight affects the aircraft.
Derivation
“Airframe” refers to the structural body of the aircraft (the airplane minus its engines, systems, and interior). “Airframe ice” is simply ice on that structure — distinguishing it from induction ice (inside the engine intake) or carburetor ice (inside the carburetor).
Why Pilots Care
It adds weight, disrupts smooth airflow, and can raise stall speed or make the aircraft difficult or impossible to control.
Grounding Statement
Picture a rough frozen layer on the front edge of a wing: the airplane must carry that extra ice and fly with a wing shape that is no longer clean.
Intuition Check
Do not think of airframe ice as only a weight problem. It is also a shape and airflow problem, so a small amount can still have a large effect.
Example Sentence 1
After climbing through a layer of freezing drizzle, the pilot noticed airframe ice forming on the wing’s leading edge and requested a lower altitude to exit the icing conditions.
Example Sentence 2
Even a thin layer of airframe ice can increase stall speed and degrade climb performance.