What are the four levels of structural icing intensity?

The four levels of structural icing intensity are indeed classified as Trace, Light, Moderate, and Severe. This classification system is used to provide pilots and meteorologists with a standardized way to assess the potential impact of icing conditions on aircraft performance and safety.

• "Trace" indicates a very minimal accumulation of ice, which may not significantly affect aircraft performance but should still be monitored.

• "Light" suggests a small amount of ice accumulation that may be manageable with proper de-icing procedures.

• "Moderate" indicates a higher accumulation that could impose significant performance penalties and may require more aggressive de-icing or anti-icing measures.

• "Severe" represents extreme icing conditions where rapid ice accumulation can occur, leading to serious hazards for flight operations and necessitating immediate corrective action.

This clear categorization is essential for flight safety, as each level provides important information on the expected icing conditions and necessary precautions pilots must take.