Instrument Rating Exam · Mock exam

Structural icing is most severe in which type of cloud?

• A.High-level cirrus cloud where temperatures are below −40°C and ice crystals are abundant
• B.Cumulonimbus and large cumulus with high liquid water content, especially between 0°C and −20°C
• C.Stratocumulus layers with temperatures below −30°C, where droplet size is greatest
• D.Any cloud with a temperature below 0°C — all sub-zero cloud produces equal icing risk