Which statement about the function of deicing fluid types I and III is correct?

Which statement about the function of deicing fluid types I and III is correct?

• A. They remove contaminants
• B. They lubricate moving parts
• C. They delay ice formation
• D. They protect paint

Answer: (A)

The thing being tested is what deicing fluids are meant to do on an aircraft surface. Type I and Type III fluids are used to remove ice, snow, frost, and other surface contaminants from the airframe so the aircraft is safe to operate. Their primary job is cleaning and deicing the surface as they flow off, not lubricating moving parts, delaying ice formation as an end in itself, or protecting the paint. Lubrication isn’t a function of these glycol deicing fluids, and delaying ice formation (holdover) is a property mainly associated with anti-icing fluids used to keep ice from forming after application, not with the basic deicing fluids. Protecting paint isn’t the objective either—the fluids are formulated for deicing/cleaning, not coating or safeguarding the paint.

The thing being tested is what deicing fluids are meant to do on an aircraft surface. Type I and Type III fluids are used to remove ice, snow, frost, and other surface contaminants from the airframe so the aircraft is safe to operate. Their primary job is cleaning and deicing the surface as they flow off, not lubricating moving parts, delaying ice formation as an end in itself, or protecting the paint. Lubrication isn’t a function of these glycol deicing fluids, and delaying ice formation (holdover) is a property mainly associated with anti-icing fluids used to keep ice from forming after application, not with the basic deicing fluids. Protecting paint isn’t the objective either—the fluids are formulated for deicing/cleaning, not coating or safeguarding the paint.