What is the purpose of the speed protection at C-switch 106%?

The purpose of the speed protection at C-switch set to 106% is primarily to cut off fuel flow to the combustion chamber. This mechanism serves as a critical safeguard against engine overspeed conditions. When the rotational speed of the engine exceeds a certain threshold—indicated by the C-switch setting—it automatically activates to prevent further acceleration that could lead to catastrophic engine failure. By cutting off fuel flow, this system effectively reduces the combustion process, leading to a decrease in engine RPM (revolutions per minute), thereby stabilizing the operational parameters and ensuring the safety and reliability of the engine.

This protective function is crucial for maintaining the integrity of the engine's components, as sustained overspeed can result in excessive heat and structural damage, which is why the other options, while related to engine performance or efficiency, do not capture the specific safety role of the speed protection.