15 / 20
In which of these cloud types can icing be virtually ruled out?
  • A
    SC
  • B
    CU
  • C
    NS
  • D
    CI
We know that one of the requirements for the ice to form on aircraft structure is the presence of water in liquid state. Cirriform clouds such as Cirrus (CI) or Cirro-Stratus (CS) are high-level clouds with bases between 16 500 ft - 45 000 ft => well above the freezing levels and therefore they only contain ice crystals => no water in liquid state is present => no icing possibility.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.