Type IV fluids have which viscosity characteristic?

Type IV fluids have which viscosity characteristic?

• A. Low viscosity
• B. High viscosity
• C. Variable viscosity
• D. Medium viscosity

Answer: (B)

Viscosity is how thick a liquid is and how easily it flows. In aircraft de-icing and anti-icing, fluids are chosen for how long they will cling to surfaces. Type I fluid is low viscosity, so it flows off quickly. Type II and Type IV are thicker fluids designed to stay on the aircraft longer, forming a protective film. Among them, Type IV is the thicker one, giving a longer holdover time. That means Type IV fluids have high viscosity: they flow slowly and remain on surfaces long enough to protect against subsequent precipitation. The higher viscosity also makes application and removal more involved, which is why Type IV is selected when longer protection is needed.

Viscosity is how thick a liquid is and how easily it flows. In aircraft de-icing and anti-icing, fluids are chosen for how long they will cling to surfaces. Type I fluid is low viscosity, so it flows off quickly. Type II and Type IV are thicker fluids designed to stay on the aircraft longer, forming a protective film. Among them, Type IV is the thicker one, giving a longer holdover time. That means Type IV fluids have high viscosity: they flow slowly and remain on surfaces long enough to protect against subsequent precipitation. The higher viscosity also makes application and removal more involved, which is why Type IV is selected when longer protection is needed.