What does the term "fuel system contamination" refer to?

The term "fuel system contamination" specifically refers to the presence of foreign substances in the fuel. This can include various contaminants such as water, dirt, rust, microorganisms, or any other unwanted materials that can enter the fuel system. Contaminants can lead to operational issues in an aircraft, such as clogged fuel filters, engine performance problems, and even safety hazards.

Understanding fuel system contamination is critical because maintaining clean fuel directly affects engine performance and overall aircraft safety. It underscores the importance of proper fuel handling, storage, and filtration processes to ensure that the fuel remains uncontaminated from the point of purchase to the point of use. Contaminated fuel can profoundly affect engine operation, making it vital for those involved in aviation fuel systems to recognize and address possible contamination sources.