What happens to turbine blades when avgas is used in a turbine engine?

When aviation gasoline (avgas) is used in a turbine engine, one significant effect is the potential development of lead deposits on the turbine blades. Avgas, particularly the grades that contain tetraethyl lead (TEL), can introduce lead into the combustion process. When combustion occurs, lead can accumulate on the turbine blades over time, forming deposits that can negatively impact the engine's performance and efficiency.

These lead deposits can lead to issues such as increased weight on the blades, reduced aerodynamic efficiency, and potential overheating due to altered heat transfer properties. Additionally, maintaining these deposits requires further maintenance actions, as they can hinder the normal operation of the blades, leading to increased operational costs and downtime.

In contrast, the other options do not accurately reflect the impact of using avgas in turbine engines, thus highlighting why the formation of lead deposits is the correct and relevant concern here.