No pilot wants to be flying an iced-up aircraft, and hopefully you never will. But as winter weather bears down, it’s worth taking the time to understand principles of icing: how different clouds and temperatures produce different kinds of water droplets, how and where ice is most likely to form, and what ice does to your aircraft’s performance. Technical Editor Crista Worthy discusses these principles, as well as sharing advice from NASA on how to fly and land with an ice-contaminated airplane, concentrating on how to avoid a tailplane stall and what to do if it does occur.