What is a characteristic of SAE and ISO Type II fluids?

The correct answer highlights a key characteristic of SAE and ISO Type II fluids, specifically that they require higher flow-off rates. Type II de-icing and anti-icing fluids are designed for use during winter operations to provide effective aircraft protection against ice and snow accumulation.

One of the defining features of these fluids is their higher viscosity compared to Type I, allowing them to better adhere to the aircraft surfaces. However, this increased viscosity also necessitates higher flow-off rates once applied, as they are typically used when temperatures are anticipated to drop or when light snow or ice is present. The higher flow-off rate ensures that the fluid can effectively manage ice without leaving excessive residue on the aircraft.

The other options do not accurately reflect the characteristics of Type II fluids. For example, while there are specific operational guidelines regarding wind and temperature, they are not strictly limited to warm weather use, nor are they only applicable to aircraft with certain VR specifications or solely for de-icing. Instead, they play a broader role in both de-icing and preventing ice accumulation during flight operations.