When an aircraft flies through clouds containing supercooled water droplets, the moisture freezes upon contact with the leading edges, wings, and engine intakes. This buildup disrupts the aerodynamic shape of the wing, increasing drag and destroying lift while adding significant weight. Pilots must activate anti-ice systems or change altitude immediately to escape the moisture layer before the aircraft loses the ability to stay airborne.
Heard on the job
Approach, we're picking up moderate icing at flight level one niner zero, requesting lower.
Insider tip
Clear ice is the most dangerous form because it is heavy, hard to see, and alters the wing shape drastically, whereas rime ice is milky and brittle.