What is a risk when servicing an oxygen system?

The correct answer highlights a significant risk associated with servicing an oxygen system: rapid ignition of flammable materials. Oxygen acts as an oxidizer, which means it can enhance the combustion process. When oxygen levels are heightened, even materials that are not normally flammable can ignite more easily and burn more intensely. This is particularly dangerous in environments where oil, grease, or other flammable substances are present.

When working on or servicing an oxygen system, it's crucial to ensure that surfaces are clean and free from any contaminants that could ignite in a high-oxygen environment. This is a fundamental safety protocol for anyone dealing with oxygen systems, whether in aviation, medical, or industrial contexts.

While the other options may present potential concerns—such as corrosion, incompatibility with materials, or system malfunction—they do not pose the immediate and critical fire hazard that flammable materials present in an oxygen-rich environment. It's vital for technicians to prioritize the management of flammable substances when handling oxygen systems to prevent accidents or catastrophic failures.